## B Physics and Light States

This page contains public results from the ATLAS B Physics and Light States Working Group.

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@descriptionEnd@','publicationType':'PAPER','pressStatement':''},{'publicationId':'5063','internalLink':'https://atlas-glance.cern.ch/atlas/analysis/papers/details.php?id=5063','shortTitle':'Fragmentation fractions fs fd','fullTitle':'Determination of the ratio of $b$-quark fragmentation fractions $f_s/f_d$ in $pp$ collisions at $\\sqrt{s}= 7$ TeV with the ATLAS detector','pubShortTitle':'Measurement of $b$-quark fragementation ratio $f_{s}/f_{d}$ in pp at 7 TeV','refCode':'BPHY-2014-02','abstract':'With an integrated luminosity of 2.47 fb$^{-1}$ recorded by the ATLAS experiment at the LHC, the exclusive decays $B_{s}^{0}\\rightarrow J/\\psi\\phi$ and $B_{d}^{0}\\rightarrow J/\\psi K^{*0}$ of $B$ mesons produced in $pp$ collisions at $\\sqrt{s}= 7$ TeV are used to determine the ratio of fragmentation fractions $f_s/f_d$. From the observed yields of 6640 $\\pm$ 100(stat) $\\pm$ 220(sys) $B_{s}^{0} \\rightarrow J/\\psi\\phi$ events and 36290 $\\pm$ 320(stat) $\\pm$ 650(sys) $B_{d}^{0}\\rightarrow J/\\psi K^{*0}$ events, the quantity $\\frac{f_s}{f_d}\\frac{\\mathcal{B}(B_{s}^{0} \\rightarrow J/\\psi \\phi)}{\\mathcal{B}(B_{d}^{0} \\rightarrow J/\\psi K^{*0})}$ is estimated to be 0.199 $\\pm$ 0.004(stat) $\\pm$ 0.010(sys).','cdsLink':'','journal':'PRL','journalSub':'31-JUL-15','ecm':'7','luminosity':'2.4 fb-1','keywords':'7 TeV,Fragmentation fraction,b-hadron,2 leptons,Charged tracks','links':'@linkBegin@https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/BPHY-2014-02/@linkEnd@Documents@descriptionEnd@,@linkBegin@https://arxiv.org/abs/1507.08925@linkEnd@1507.08925@descriptionEnd@,@linkBegin@https://inspirehep.net/record/1385880@linkEnd@Inspire@descriptionEnd@
','run':'1','finalPubRef':'@linkBegin@https://dx.doi.org/10.1103/PhysRevLett.115.262001@linkEnd@DOI:10.1103/PhysRevLett.115.262001@descriptionEnd@-,-@linkBegin@https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.115.262001@linkEnd@Phys.%20Rev.%20Lett.%20115%20(2015)%20262001@descriptionEnd@','publicationType':'PAPER','pressStatement':''},{'publicationId':'4482','internalLink':'https://atlas-glance.cern.ch/atlas/analysis/papers/details.php?id=4482','shortTitle':'Observation of LamB -> Lambda psi2s','fullTitle':'Measurement of the branching ratio $\\Gamma(\\Lambda_b^0 \\rightarrow \\psi(2S)\\Lambda^0)/\\Gamma(\\Lambda_b^0 \\rightarrow J/\\psi\\Lambda^0)$ with the ATLAS detector','pubShortTitle':'Observation of $\\Lambda_{b}\\rightarrow \\psi(2S)$','refCode':'BPHY-2013-08','abstract':'An observation of the $\\Lambda_b^0 \\rightarrow \\psi(2S) \\Lambda^0$ decay and a comparison of its branching fraction with that of the $\\Lambda_b^0 \\rightarrow J/\\psi \\Lambda^0$ decay has been made with the ATLAS detector in proton--proton collisions at $\\sqrt{s}=8\\,$TeV at the LHC using an integrated luminosity of $20.6\\,$fb$^{-1}$. The $J/\\psi$ and $\\psi(2S)$ mesons are reconstructed in their decays to a muon pair, while the $\\Lambda^0\\rightarrow p\\pi^-$ decay is exploited for the $\\Lambda^0$ baryon reconstruction. The $\\Lambda_b^0$ baryons are reconstructed with transverse momentum $p_{\\rm T}>10\\,$GeV and pseudorapidity $|\\eta|<2.1$. The measured branching ratio of the $\\Lambda_b^0 \\rightarrow \\psi(2S) \\Lambda^0$ and $\\Lambda_b^0 \\rightarrow J/\\psi \\Lambda^0$ decays is $\\Gamma(\\Lambda_b^0 \\rightarrow \\psi(2S)\\Lambda^0)/\\Gamma(\\Lambda_b^0 \\rightarrow J/\\psi\\Lambda^0) = 0.501\\pm 0.033 ({\\rm stat})\\pm 0.019({\\rm syst})$, lower than the expectation from the covariant quark model.','cdsLink':'','journal':'PLB','journalSub':'29-JUL-15','ecm':'8','luminosity':'20.6 fb-1','keywords':'8 TeV,Secondary vertices,Branching fraction measurements,b-hadron,2 leptons,Charged tracks','links':'@linkBegin@https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/BPHY-2013-08/@linkEnd@Documents@descriptionEnd@,@linkBegin@https://arxiv.org/abs/1507.08202@linkEnd@1507.08202@descriptionEnd@,@linkBegin@https://inspirehep.net/record/1385604@linkEnd@Inspire@descriptionEnd@
','run':'1','finalPubRef':'@linkBegin@https://dx.doi.org/10.1016/j.physletb.2015.10.009@linkEnd@DOI@descriptionEnd@-,-@linkBegin@https://www.sciencedirect.com/science/article/pii/S0370269315007601@linkEnd@Physics Letters B 751 (2015) 63-80@descriptionEnd@','publicationType':'PAPER','pressStatement':''},{'publicationId':'5202','internalLink':'https://atlas-glance.cern.ch/atlas/analysis/papers/details.php?id=5202','shortTitle':'Branching fractions of Bc Jpsi Ds','fullTitle':'Study of the $B_c^+ \\to J/\\psi D_s^+$ and $B_c^+ \\to J/\\psi D_s^{*+}$ decays with the ATLAS detector','pubShortTitle':'Branching fractions of $B_{c}\\rightarrow J/\\psi D_{s}^{( * )}$','refCode':'BPHY-2014-04','abstract':'The decays $B_c^+ \\to J/\\psi D_s^+$ and $B_c^+ \\to J/\\psi D_s^{*+}$ are studied with the ATLAS detector at the LHC using a dataset corresponding to integrated luminosities of 4.9 fb$^{-1}$ and 20.6 fb$^{-1}$ of $pp$ collisions collected at centre-of-mass energies $\\sqrt{s } = 7$ TeV and 8 TeV, respectively. Signal candidates are identified through $J/\\psi\\to\\mu^+\\mu^-$ and $D_s^{( * )+}\\to\\phi\\pi^+(\\gamma/\\pi^0)$ decays. With a two-dimensional likelihood fit involving the $B_c^+$ reconstructed invariant mass and an angle between the $\\mu^+$ and $D_s^+$ candidate momenta in the muon pair rest frame, the yields of $B_c^+ \\to J/\\psi D_s^+$ and $B_c^+ \\to J/\\psi D_s^{*+}$, and the transverse polarisation fraction in $B_c^+ \\to J/\\psi D_s^{*+}$ decay are measured. The transverse polarisation fraction is determined to be $\\Gamma_{\\pm\\pm}(B_c^+ \\to J/\\psi D_s^{*+})/\\Gamma(B_c^+ \\to J/\\psi D_s^{*+}) = 0.38 \\pm 0.23 \\pm 0.07$, and the derived ratio of the branching fractions of the two modes is $\\mathcal{B}_{B_c^+ \\to J/\\psi D_s^{*+}}/\\mathcal{B}_{B_c^+ \\to J/\\psi D_s^+ } = 2.8 \\,^{+1.2}_{-0.8} \\pm 0.3$, where the first error is statistical and the second is systematic. Finally, a sample of $B_c^+\\to J/\\psi\\pi^+$ decays is used to derive the ratios of branching fractions $\\mathcal{B}_{B_c^+ \\to J/\\psi D_s^+}/\\mathcal{B}_{B_c^+ \\to J/\\psi \\pi^+ } = 3.8 \\pm 1.1 \\pm 0.4 \\pm 0.2$ and $\\mathcal{B}_{B_c^+ \\to J/\\psi D_s^{*+}}/\\mathcal{B}_{B_c^+ \\to J/\\psi \\pi^+ } = 10.4 \\pm 3.1 \\pm 1.5 \\pm 0.6$, where the third error corresponds to the uncertainty of the branching fraction of $D_s^+\\to\\phi(K^+K^-)\\pi^+$ decay. The available theoretical predictions are generally consistent with the measurement.','cdsLink':'','journal':'EPJC','journalSub':'25-JUL-15','ecm':'7, 8','luminosity':'4.9 fb-1, 20.6 fb-1','keywords':'7 TeV,Secondary vertices,Branching fraction measurements,c-hadron,b-hadron,2 leptons,Charged tracks,8 TeV','links':'@linkBegin@https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/BPHY-2014-04/@linkEnd@Documents@descriptionEnd@,@linkBegin@https://arxiv.org/abs/1507.07099@linkEnd@1507.07099@descriptionEnd@,@linkBegin@https://inspirehep.net/record/1385102@linkEnd@Inspire@descriptionEnd@
','run':'1; 1','finalPubRef':'@linkBegin@https://dx.doi.org/10.1140/epjc/s10052-015-3743-8@linkEnd@DOI:10.1140/epjc/s10052-015-3743-8@descriptionEnd@-,-@linkBegin@https://link.springer.com/article/10.1140/epjc/s10052-015-3743-8@linkEnd@Eur.%20Phys.%20J.%20C.%2076%20(2016)%201@descriptionEnd@','publicationType':'PAPER','pressStatement':''},{'publicationId':'5062','internalLink':'https://atlas-glance.cern.ch/atlas/analysis/papers/details.php?id=5062','shortTitle':'Associated Jpsi and Z production','fullTitle':'Observation and measurements of the production of prompt and non-prompt J/psi mesons in association with a Z boson in proton-proton collisions at sqrt(s) = 8 TeV with the ATLAS detector','pubShortTitle':'Associated production of $J/\\psi$ and Z boson at 8 TeV','refCode':'BPHY-2014-01','abstract':'The production of a $Z$ boson in association with a $J/\\psi$ meson in proton--proton collisions probes the production mechanisms of quarkonium and heavy flavour in association with vector bosons, and allows studies of multiple parton scattering. Using $20.3\\,\\mathrm{fb^{-1}}$ of data collected with the ATLAS experiment at the LHC, in $pp$ collisions at $\\sqrt{s}= 8$ TeV, the first measurement of associated $Z\\, +\\, J/\\psi$ production is presented for both prompt and non-prompt $J/\\psi$ production, with both signatures having a significance in excess of $5\\sigma$. The inclusive production cross-sections for $Z$ boson production (in $\\mu^+\\mu^-$ or $e^+e^-$ decay modes) in association with prompt and non-prompt $J/\\psi(\\to\\mu^+\\mu^-)$ are measured relative to the inclusive production rate of $Z$ bosons in the same fiducial volume to be $(88\\pm 16\\pm 6)\\, \\times\\, 10^{-8}$ and $(157\\pm 22\\pm 10)\\, \\times\\, 10^{-8}$ respectively. Normalised differential production cross-sections are also determined as a function of the $J/\\psi$ transverse momentum. The fraction of signal events arising from single and double parton scattering is estimated, and a lower limit of $5.3\\ (3.7)\\,\\mathrm{mb}$ at $68\\ (95) \\%$ confidence level is placed on the effective cross-section regulating double parton interactions.','cdsLink':'','journal':'EPJC','journalSub':'19-DEC-14','ecm':'8','luminosity':'20.3 fb-1','keywords':'8 TeV,Quarkonium,Non-prompt production,Prompt production,AssociatedÂ production,Double parton scattering,Differential measurement,Cross-section measurement,Z,>=3 leptons','links':'@linkBegin@https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/BPHY-2014-01@linkEnd@Documents@descriptionEnd@,@linkBegin@https://arxiv.org/abs/1412.6428@linkEnd@1412.6428@descriptionEnd@,@linkBegin@https://inspirehep.net/record/1335136@linkEnd@Inspire@descriptionEnd@
','run':'1','finalPubRef':'@linkBegin@https://dx.doi.org/10.1140/epjc/s10052-015-3406-9@linkEnd@DOI@descriptionEnd@-,-@linkBegin@https://link.springer.com/article/10.1140/epjc/s10052-015-3406-9@linkEnd@Eur. Phys. J. C75 (2015) 229@descriptionEnd@','publicationType':'PAPER','pressStatement':''},{'publicationId':'4142','internalLink':'https://atlas-glance.cern.ch/atlas/analysis/papers/details.php?id=4142','shortTitle':'Bottomonium 2 pions transition','fullTitle':'Search for the Xb and other hidden-beauty states using the pi+pi-Y(1S) channel at ATLAS','pubShortTitle':'Search for hidden beauty states in $\\Upsilon(1S)\\pi\\pi$ in pp at 7 TeV','refCode':'BPHY-2013-07','abstract':'This Letter presents a search for a hidden-beauty counterpart of the $X(3872)$ in the mass ranges 10.05--10.31 GeV and 10.40--11.00 GeV, in the channel $X_b \\to \\pi^{+} \\pi^{-} \\Upsilon(1 \\rm S)(\\rightarrow\\mu^+\\mu^-)$, using 16.2 fb$^{-1}$ of $\\sqrt{s}=8$ TeV $pp$ collision data collected by the ATLAS detector at the LHC. No evidence for new narrow states is found, and upper limits are set on the product of the $X_b$ cross section and branching fraction, relative to those of the $\\Upsilon(2 \\rm S)$, at the 95% confidence level using the CL$_S$ approach. These limits range from 0.8% to 4.0%, depending on mass. For masses above 10.1 GeV, the expected upper limits from this analysis are the most restrictive to date. Searches for production of the $\\Upsilon(1^3 \\rm{D}$$_J)$, $\\Upsilon(10860)$, and $\\Upsilon(11020)$ states also reveal no significant signals.','cdsLink':'','journal':'PLB','journalSub':'16-OCT-14','ecm':'8','luminosity':'16.2 fb-1','keywords':'8 TeV,Exotic states,Spectroscopy,Quarkonium,Prompt production,2 leptons,Charged tracks','links':'@linkBegin@https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/BPHY-2013-07@linkEnd@Documents@descriptionEnd@,@linkBegin@https://arxiv.org/abs/1410.4409@linkEnd@1410.4409@descriptionEnd@,@linkBegin@https://inspirehep.net/record/1322568@linkEnd@Inspire@descriptionEnd@
','run':'1','finalPubRef':'@linkBegin@https://dx.doi.org/10.1016/j.physletb.2014.11.055@linkEnd@DOI:10.1016/j.physletb.2014.11.055@descriptionEnd@-,-@linkBegin@https://www.sciencedirect.com/science/article/pii/S0370269314008648@linkEnd@Physics%20Letters%20B%20%20740%20(2015)%20199@descriptionEnd@','publicationType':'PAPER','pressStatement':''},{'publicationId':'4122','internalLink':'https://atlas-glance.cern.ch/atlas/analysis/papers/details.php?id=4122','shortTitle':'Psi pi pi production cross section','fullTitle':'Measurement of the production cross-section of Psi(2S) -> J/psi(->mu+mu-) pi+pi- in pp collisions at sqrt(s) = 7 TeV at ATLAS','pubShortTitle':'$\\psi(2S)$ production in decays to $J/\\psi\\pi\\pi$ in pp at 7 TeV','refCode':'BPHY-2013-06','abstract':'The prompt and non-prompt production cross-sections for $\\psi(2S)$ mesons are measured using 2.1 fb$^{-1}$ of $pp$ collision data at a centre-of-mass energy of 7 TeV recorded by the ATLAS experiment at the LHC. The measurement exploits the $\\psi(2S)\\to J/\\psi(\\to\\mu^+\\mu^-)\\pi^+\\pi^-$ decay mode, and probes $\\psi(2S)$ mesons with transverse momenta in the range $10\\leq p_T<100$ GeV and rapidity $|y|<2.0$. The results are compared to other measurements of $\\psi(2S)$ production at the LHC and to various theoretical models for prompt and non-prompt quarkonium production.','cdsLink':'','journal':'JHEP','journalSub':'21-JUL-14','ecm':'7','luminosity':'2.1 fb-1','keywords':'7 TeV,Spectroscopy,Quarkonium,Non-prompt production,Prompt production,Differential measurement,Cross-section measurement,2 leptons,Charged tracks','links':'@linkBegin@https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/BPHY-2013-06@linkEnd@Documents@descriptionEnd@,@linkBegin@https://arxiv.org/abs/1407.5532@linkEnd@1407.5532@descriptionEnd@,@linkBegin@https://inspirehep.net/record/1307103@linkEnd@Inspire@descriptionEnd@
','run':'1','finalPubRef':'@linkBegin@https://dx.doi.org/10.1007/JHEP09(2014)079@linkEnd@DOI:10.1007/JHEP09(2014)079@descriptionEnd@-,-@linkBegin@https://link.springer.com/article/10.1007/JHEP09(2014)079@linkEnd@JHEP09(2014)079@descriptionEnd@','publicationType':'PAPER','pressStatement':''},{'publicationId':'3742','internalLink':'https://atlas-glance.cern.ch/atlas/analysis/papers/details.php?id=3742','shortTitle':'Bs->J/psi phi tagged','fullTitle':'Flavour tagged time dependent angular analysis of the Bs->J/psi phi decay and extraction of Delta Gamma_s and the weak phase phi_s in ATLAS','pubShortTitle':'Time dependent flavour-tagged $\\phi_{s}$ and $\\Delta\\Gamma_{s}$ from $B_{s}\\rightarrow J/\\psi \\phi$ at 7 TeV','refCode':'BPHY-2013-01','abstract':'A measurement of the $B_s \\rightarrow J/\\psi \\phi$ decay parameters, updated to include flavour tagging is reported using $4.9 fb^{-1}$ of integrated luminosity collected by the ATLAS detector from $\\sqrt{s}= 7$TeV $pp$ collisions recorded in 2011 at the LHC. The values measured for the physical parameters are: \\begin{eqnarray*} \\phi_s & = & 0.12 \\pm 0.25(stat.)\\pm 0.05(syst.)rad \\\\ \\Delta\\Gamma & = & 0.053 \\pm 0.021(stat.) 0.010(syst.)ps^{-1} \\\\ \\Gamma_s & = & 0.677 \\pm 0.007 (stat.)\\pm 0.004 (syst.)ps^{-1}\\\\ |A_{\\parallel}(0)|^2 & = & 0.220 \\pm 0.008 (stat.)\\pm 0.009(syst.)\\\\ |A_{0}(0)|^2 & = & 0.529 \\pm 0.006 (stat.)\\pm 0.012(syst.)\\\\ \\delta_\\perp & = & 3.89 \\pm 0.47(stat.) \\pm 0.11(syst.)rad \\end{eqnarray*} where the parameter $\\Delta\\Gamma$ is constrained to be positive. The $S$-wave contribution was measured and found to be compatible with zero. Results for $\\phi_s$ and $\\Delta\\Gamma$ are also presented as $68\\%$ and $95\\%$ likelihood contours, which show agreement with the Standard Model expectations.','cdsLink':'','journal':'PRD','journalSub':'05-JUL-14','ecm':'7','luminosity':'4.9 fb-1','keywords':'7 TeV,Lifetime measurements,Phi_s measurements,CP violation,b-hadron,2 leptons,Charged tracks','links':'@linkBegin@https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/BPHY-2013-01@linkEnd@Documents@descriptionEnd@,@linkBegin@https://arxiv.org/abs/1407.1796@linkEnd@1407.1796@descriptionEnd@,@linkBegin@https://inspirehep.net/record/1305098@linkEnd@Inspire@descriptionEnd@
','run':'1','finalPubRef':'@linkBegin@https://dx.doi.org/10.1103/PhysRevD.90.052007@linkEnd@DOI:10.1103/PhysRevD.90.052007@descriptionEnd@-,-@linkBegin@https://journals.aps.org/prd/abstract/10.1103/PhysRevD.90.052007@linkEnd@Phys. Rev. D. 90, 052007 (2014)@descriptionEnd@','publicationType':'PAPER','pressStatement':''},{'publicationId':'2722','internalLink':'https://atlas-glance.cern.ch/atlas/analysis/papers/details.php?id=2722','shortTitle':'Excited Bc meson','fullTitle':'Observation of an excited $B_{c}$ meson state','pubShortTitle':'Observation of an excited $B_{c}$ meson state','refCode':'BPHY-2012-04','abstract':'A search for excited states of the $B^{\\pm}_c$ meson is performed using 4.9 fb$^{-1}$ of 7 TeV and 19.2 fb$^{-1}$ of 8 TeV $pp$ collision data collected by the ATLAS experiment at the LHC. A new state is observed through its hadronic transition to the ground state, with the latter detected in the decay $B_c^{\\pm} \\to J/\\psi \\pi^{\\pm}$. The state appears in the $m(B_c^{\\pm}\\pi^{+}\\pi^{-})-m(B_c^{\\pm})-2m(\\pi^{\\pm})$ mass difference distribution with a significance of 5.2 standard deviations. The mass of the observed state is $6842 \\pm 4 \\pm 5$~MeV, where the first error is statistical and the second is systematic. The mass and decay of this state are consistent with expectations for the second $S\\mbox{-}$wave state of the $B^{\\pm}_c$ meson, $B^{\\pm}_c(2S)$.','cdsLink':'','journal':'PRL','journalSub':'03-JUL-14','ecm':'7, 8','luminosity':'4.9 fb-1, 19.2 fb-1','keywords':'7 TeV,Spectroscopy,Mass measurement,c-hadron,b-hadron,2 leptons,Charged tracks,8 TeV','links':'@linkBegin@https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/BPHY-2012-04@linkEnd@Documents@descriptionEnd@,@linkBegin@https://arxiv.org/abs/1407.1032@linkEnd@1407.1032@descriptionEnd@,@linkBegin@https://inspirehep.net/record/1304691@linkEnd@Inspire@descriptionEnd@
@linkBegin@http://atlas.cern/updates/physics-briefing/new-state-beauty-and-charm@linkEnd@Briefing@descriptionEnd@','run':'1; 1','finalPubRef':'@linkBegin@https://dx.doi.org/10.1103/PhysRevLett.113.212004@linkEnd@DOI@descriptionEnd@-,-@linkBegin@https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.113.212004@linkEnd@Phys. Rev. Lett. 113, 212004 (2014)@descriptionEnd@','publicationType':'PAPER','pressStatement':''},{'publicationId':'4083','internalLink':'https://atlas-glance.cern.ch/atlas/analysis/papers/details.php?id=4083','shortTitle':'Production of Charmonium chi state','fullTitle':'Measurement of chi_c1 and chi_c2 production with sqrt(s) = 7 TeV pp collisions at ATLAS','pubShortTitle':'$\\chi_{c1,2}$ production in pp at 7 TeV','refCode':'BPHY-2013-05','abstract':'The prompt and non-prompt production cross-sections for the $\\chi_{c1}$ and $\\chi_{c2}$ charmonium states are measured in $pp$ collisions at $\\sqrt{s}= 7$ TeV with the ATLAS detector at the LHC using 4.5 fb-1 of integrated luminosity. The $\\chi_{c}$ states are reconstructed through the radiative decay $\\chi_{c}\\rightarrow J/\\psi\\,\\gamma$ (with $J/\\psi\\rightarrow\\mu^{+}\\mu^{-}$) where photons are reconstructed from $\\gamma\\rightarrow e^{+}e^{-}$ conversions. The production rate of the $\\chi_{c2}$ state relative to the $\\chi_{c1}$ state is measured for prompt and non-prompt $\\chi_{c}$ as a function of $J/\\psi$ transverse momentum. The prompt $\\chi_{c}$ cross-sections are combined with existing measurements of prompt $J/\\psi$ production to derive the fraction of prompt $J/\\psi$ produced in feed-down from $\\chi_{c}$ decays. The fractions of $\\chi_{c1}$ and $\\chi_{c2}$ produced in $b$-hadron decays are also measured. In addition to measurements of inclusive $\\chi_{c}$ production, the branching fraction ${\\cal B}(B^{\\pm}\\rightarrow\\chi_{c1} K^{\\pm}) = (4.9 \\pm 0.9 (stat.) \\pm 0.6 (syst.))\\times 10^{-4}$ is measured with the same dataset and $\\chi_{c}$ event selection.','cdsLink':'','journal':'JHEP','journalSub':'28-APR-14','ecm':'7','luminosity':'4.5 fb-1','keywords':'7 TeV,Spectroscopy,Quarkonium,Radiative decays,Non-prompt production,Prompt production,Differential measurement,Cross-section measurement,Photon,Photons,2 leptons','links':'@linkBegin@https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/BPHY-2013-05/@linkEnd@Documents@descriptionEnd@,@linkBegin@https://arxiv.org/abs/1404.7035@linkEnd@1404.7035@descriptionEnd@,@linkBegin@https://inspirehep.net/record/1292798@linkEnd@Inspire@descriptionEnd@
','run':'1','finalPubRef':'@linkBegin@https://dx.doi.org/10.1007/JHEP07(2014)154@linkEnd@DOI:10.1007/JHEP07(2014)154@descriptionEnd@-,-@linkBegin@https://link.springer.com/article/10.1007/JHEP07(2014)154@linkEnd@JHEP07(2014)154@descriptionEnd@','publicationType':'PAPER','pressStatement':''},{'publicationId':'3902','internalLink':'https://atlas-glance.cern.ch/atlas/analysis/papers/details.php?id=3902','shortTitle':'!LambdaB decay asymmetry','fullTitle':'Measurement of the parity violating asymmetry parameter alpha_b and the helicity amplitudes for the decay LambdaB -> J/psi Lambda0 with the ATLAS detector','pubShortTitle':'Measurement of helicity amplitudes in decays of $\\Lambda_{b}$','refCode':'BPHY-2013-03','abstract':'A measurement of the parity-violating decay asymmetry parameter, $\\alpha_b$, and the helicity amplitudes for the decay $\\Lambda_b^0\\to J/\\psi(\\mu^+\\mu^-) \\Lambda^0 (p\\pi^-)$ is reported. The analysis is based on 1400 $\\Lambda_b^0$ and $\\bar{\\Lambda}_b^0$ baryons selected in $4.6~\\rm{fb}^{-1}$ of proton--proton collision data with a center-of-mass energy of 7 TeV recorded by the ATLAS experiment at the LHC. By combining the $\\Lambda_b^0$ and $\\bar{\\Lambda}_b^0$ samples under the assumption of $CP$ conservation, the value of $\\alpha_b$ is measured to be $0.30\\pm0.16 ({\\rm stat})\\pm 0.06 ({\\rm syst})$. This measurement provides a test of theoretical models based on perturbative QCD or heavy-quark effective theory.','cdsLink':'','journal':'PRD','journalSub':'04-APR-14','ecm':'7','luminosity':'4.6 fb-1','keywords':'7 TeV,Helicity amplitudes,b-hadron,2 leptons,Charged tracks','links':'@linkBegin@https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/BPHY-2013-03/@linkEnd@Documents@descriptionEnd@,@linkBegin@https://arxiv.org/abs/1404.1071@linkEnd@1404.1071@descriptionEnd@,@linkBegin@https://inspirehep.net/record/1288490@linkEnd@Inspire@descriptionEnd@
','run':'1','finalPubRef':'@linkBegin@https://dx.doi.org/10.1103/PhysRevD.89.092009@linkEnd@DOI:10.1103/PhysRevD.89.092009@descriptionEnd@-,-@linkBegin@https://journals.aps.org/prd/abstract/10.1103/PhysRevD.89.092009@linkEnd@PhysRevD.89.092009@descriptionEnd@','publicationType':'PAPER','pressStatement':''},{'publicationId':'3022','internalLink':'https://atlas-glance.cern.ch/atlas/analysis/papers/details.php?id=3022','shortTitle':'Associated Jpsi and W production','fullTitle':'Measurement of the production cross-section of prompt J/Psi mesons in association with a W boson in pp collisions at sqrt(s) = 7 TeV with the ATLAS detector','pubShortTitle':'Associated production of $J/\\psi$ and W boson at 7 TeV','refCode':'BPHY-2012-06','abstract':'The process pp--> W + J/psi provides a powerful probe of the production mechanism of charmonium in hadronic collisions, and is also sensitive to multiple parton interactions in the colliding protons. Using the 2011 ATLAS dataset of 4.5 fb-1 of sqrt{s } = 7 TeV pp collisions at the LHC, the first observation is made of the production of W + prompt J/psi events in hadronic collisions, using W-->mu+nu and J/psi-->mu+mu. A yield of 27.4+7.5-6.5 W + prompt J/psi events is observed, with a statistical significance of 5.1 sigma. The production rate as a ratio to the inclusive W boson production rate is measured, and the double parton scattering contribution to the cross section is estimated.','cdsLink':'','journal':'JHEP','journalSub':'14-JAN-14','ecm':'7','luminosity':'4.5 fb-1','keywords':'7 TeV,Quarkonium,Prompt production,AssociatedÂ production,Double parton scattering,Differential measurement,Cross-section measurement,W,>=3 leptons','links':'@linkBegin@https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/BPHY-2012-06/@linkEnd@Documents@descriptionEnd@,@linkBegin@https://arxiv.org/abs/1401.2831@linkEnd@1401.2831@descriptionEnd@,@linkBegin@https://inspirehep.net/record/1276825@linkEnd@Inspire@descriptionEnd@
@linkBegin@http://hepdata.cedar.ac.uk/view/ins1276825@linkEnd@HepData@descriptionEnd@','run':'1','finalPubRef':'@linkBegin@https://dx.doi.org/10.1007/JHEP04(2014)172@linkEnd@DOI:10.1007/JHEP04(2014)172@descriptionEnd@-,-@linkBegin@https://link.springer.com/article/10.1007/JHEP04(2014)172@linkEnd@JHEP04(2014)172@descriptionEnd@','publicationType':'PAPER','pressStatement':''},{'publicationId':'2843','internalLink':'https://atlas-glance.cern.ch/atlas/analysis/papers/details.php?id=2843','shortTitle':'Bplus cross section at 7 TeV','fullTitle':'Measurement of the differential cross section of B+ meson production in pp collisions at sqrt(s) = 7 TeV at ATLAS','pubShortTitle':'$B^{+}$ production at pp collisions at 7 TeV','refCode':'BPHY-2012-05','abstract':'The production cross-section of $B^+$ mesons is measured as a function of transverse momentum $p_T$ and rapidity y in protonâ€“proton collisions at center-of-mass energy $\\sqrt{s}$ = 7 TeV, using 2.4 fb$^{-1}$ of data recorded with the ATLAS detector at the Large Hadron Collider. The differential production cross-sections, determined in the range 9 GeV < $p_T$ < 120 GeV and |y| < 2.25, are compared to next-to-leading-order theoretical predictions.','cdsLink':'','journal':'JHEP','journalSub':'29-JUN-13','ecm':'7','luminosity':'2.4 fb-1','keywords':'7 TeV,Differential measurement,Cross-section measurement,b-hadron,2 leptons,Charged tracks','links':'@linkBegin@https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/BPHY-2012-05/@linkEnd@Documents@descriptionEnd@,@linkBegin@https://arxiv.org/abs/1307.0126@linkEnd@1307.0126[hep-ex]@descriptionEnd@,@linkBegin@https://inspirehep.net/record/1240670@linkEnd@Inspire@descriptionEnd@
@linkBegin@http://hepdata.cedar.ac.uk/view/red6091@linkEnd@HepData@descriptionEnd@','run':'1','finalPubRef':'@linkBegin@https://dx.doi.org/10.1007/JHEP10(2013)042@linkEnd@DOI:10.1007/JHEP10(2013)042@descriptionEnd@-,-@linkBegin@https://link.springer.com/article/10.1007/JHEP10(2013)042@linkEnd@JHEP10(2013)042@descriptionEnd@','publicationType':'PAPER','pressStatement':''},{'publicationId':'1441','internalLink':'https://atlas-glance.cern.ch/atlas/analysis/papers/details.php?id=1441','shortTitle':'Upsilon cross section','fullTitle':'Measurement of Upsilon production in 7 TeV pp collisions at ATLAS','pubShortTitle':'Upsilon cross-section in 7 TeV pp','refCode':'BPHY-2011-06','abstract':'Using 1.8 fb-1 of pp collisions at a center-of-mass energy of 7 TeV recorded by the ATLAS detector at the Large Hadron Collider, we present measurements of the production cross sections of Upsilon(1S,2S,3S) mesons. Upsilon mesons are reconstructed using the di-muon decay mode. Total production cross sections for p_T<70 GeV and in the rapidity interval |$y^{\\Upsilon}$|<2.25 are measured to be 8.01+-0.02+-0.36+-0.31 nb, 2.05+-0.01+-0.12+-0.08 nb, 0.92+-0.01+-0.07+-0.04 nb respectively, with uncertainties separated into statistical, systematic, and luminosity measurement effects. In addition, differential cross section times di-muon branching fractions for Upsilon(1S), Upsilon(2S), and Upsilon(3S) as a function of Upsilon transverse momentum p_T and rapidity are presented. These cross sections are obtained assuming unpolarized production. If the production polarization is fully transverse or longitudinal with no azimuthal dependence in the helicity frame the cross section may vary by approximately +-20%. If a non-trivial azimuthal dependence is considered, integrated cross sections may be significantly enhanced by a factor of two or more. We compare our results to several theoretical models of Upsilon meson production, finding that none provide an accurate description of our data over the full range of Upsilon transverse momenta accessible with this dataset.','cdsLink':'','journal':'PRD','journalSub':'30-NOV-12','ecm':'7','luminosity':'1.8 fb-1','keywords':'7 TeV,Quarkonium,Muon pairs,Prompt production,Differential measurement,Cross-section measurement,2 leptons','links':'@linkBegin@https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/BPHY-2011-06/@linkEnd@Documents@descriptionEnd@,@linkBegin@https://arxiv.org/abs/1211.7255@linkEnd@1211.7255[hep-ex]@descriptionEnd@,@linkBegin@https://inspirehep.net/record/1204994?ln=en@linkEnd@Inspire@descriptionEnd@
@linkBegin@http://hepdata.cedar.ac.uk/view/ins1204994@linkEnd@HepData@descriptionEnd@','run':'1','finalPubRef':'@linkBegin@https://link.aps.org/doi/10.1103/PhysRevD.87.052004@linkEnd@DOI:10.1103/PhysRevD.87.052004@descriptionEnd@-,-@linkBegin@https://prd.aps.org/abstract/PRD/v87/i5/e052004@linkEnd@Phys. Rev. D 87, 052004 (2013)@descriptionEnd@','publicationType':'PAPER','pressStatement':''},{'publicationId':'1381','internalLink':'https://atlas-glance.cern.ch/atlas/analysis/papers/details.php?id=1381','shortTitle':'Bs->J/psi phi','fullTitle':'Time dependent angular analysis of the decay Bs->J/psi phi and extraction of Delta Gamma_s and the CP-violating weak phase phi_s by ATLAS','pubShortTitle':'Time dependent untagged $\\phi_{s}$ and $\\Delta\\Gamma_{s}$ from $B_{s}\\rightarrow J/\\psi \\phi$','refCode':'BPHY-2011-05','abstract':'A measurement of $B_s^0 \\to J/\\psi \\phi$ decay parameters, including the CP-violating weak phase $\\phi_s$ and the decay width difference $\\Delta \\Gamma_s$ is reported, using 4.9 fb$^{-1}$ of integrated luminosity collected in 2011 by the ATLAS detector from LHC pp collisions at a centre-of-mass energy $\\sqrt{s}$ = 7 TeV. The mean decay width $\\Gamma_s$ and the transversity amplitudes $|A_0(0)|^2$ and $|A_{||}(0)|^2$ are also measured. The values reported for these parameters are: \\begin{eqnarray}\\cr \\phi_s = 0.22 \\pm 0.41 (stat.) \\pm 0.10 (syst.) rad\\cr \\Delta \\Gamma_s = 0.053 \\pm 0.021 (stat.) \\pm 0.008 (syst.) ps^{-1}\\cr \\Gamma_s = 0.677 \\pm 0.007 (stat.) \\pm 0.004 (syst.) ps^{-1}\\cr |A_0(0)|^2 = 0.528 \\pm 0.006 (stat.) \\pm 0.009 (syst.)\\cr |A_{||}(0)|^2 = 0.220 \\pm 0.008 (stat.) \\pm 0.007 (syst.)\\cr\\end{eqnarray} where the values quoted for $\\phi_s$ and $\\Delta \\Gamma_s$ correspond to the solution compatible with the external measurements to which the strong phase $\\delta$ perpendicular is constrained and where $\\Delta \\Gamma_s$ is constrained to be positive. The fraction of S-wave KK or $f_0$ contamination through the decays $B_s^0 \\to J/\\psi K^+ K^-(f_0)$ is measured as well and is found to be consistent with zero. Results for $\\phi_s$ and $\\Delta \\Gamma_s$ are also presented as 68%, 90% and 95% likelihood contours, which show agreement with Standard Model expectations.','cdsLink':'','journal':'JHEP','journalSub':'02-AUG-12','ecm':'7','luminosity':'4.9 fb-1','keywords':'7 TeV,Lifetime measurements,Phi_s measurements,CP violation,Muon pairs,b-hadron,2 leptons','links':'@linkBegin@https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/BPHY-2011-05/@linkEnd@Documents@descriptionEnd@,@linkBegin@https://arxiv.org/abs/1208.0572@linkEnd@1208.0572[hep-ex]@descriptionEnd@,@linkBegin@https://inspirehep.net/record/1125576@linkEnd@Inspire@descriptionEnd@
','run':'1','finalPubRef':'@linkBegin@https://dx.doi.org/10.1007/JHEP12(2012)072@linkEnd@DOI:10.1007/JHEP12(2012)072@descriptionEnd@-,-@linkBegin@https://link.springer.com/article/10.1007/JHEP12(2012)072@linkEnd@JHEP 1212 (2012) 072@descriptionEnd@','publicationType':'PAPER','pressStatement':''},{'publicationId':'2561','internalLink':'https://atlas-glance.cern.ch/atlas/analysis/papers/details.php?id=2561','shortTitle':'!LambdaB mass and lifetime','fullTitle':'Measurement of the Lambda_b lifetime and mass in the ATLAS experiment','pubShortTitle':'$\\Lambda_{b}$ mass and lifetime','refCode':'BPHY-2012-03','abstract':'A measurement of the $\\Lambda_b^0$ lifetime and mass in the decay channel $\\Lambda_b^0 \\to J/\\psi(\\mu^+ \\mu^-) \\Lambda^0(p\\pi^-)$ is presented. The analysis uses a signal sample of about 2200 $\\Lambda_b^0$ and anti-Lambda_b decays that are reconstructed in 4.9 fb$^{-1}$ of ATLAS pp collision data collected in 2011 at the LHC center-of-mass energy of 7 TeV. A simultaneous mass and decay time maximum likelihood fit is used to extract the $\\Lambda_b^0$ lifetime and mass. They are measured to be $\\tau_{\\Lambda_b}$ = 1.449 +/- 0.036(stat) +/- 0.017(syst) ps and $m_{\\Lambda_b}$ = 5619.7 +/- 0.7(stat) +/- 1.1(syst) MeV.','cdsLink':'','journal':'PRD','journalSub':'10-JUL-12','ecm':'7','luminosity':'4.9 fb-1','keywords':'7 TeV,Secondary vertices,Lifetime measurements,Mass measurement,b-hadron,2 leptons,Charged tracks','links':'@linkBegin@https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/BPHY-2012-03/@linkEnd@Documents@descriptionEnd@,@linkBegin@https://arxiv.org/abs/1207.2284@linkEnd@1207.2284[hep-ex]@descriptionEnd@,@linkBegin@https://inspirehep.net/record/1121875@linkEnd@Inspire@descriptionEnd@
','run':'1','finalPubRef':'@linkBegin@https://link.aps.org/doi/10.1103/PhysRevD.87.032002@linkEnd@DOI:10.1103/PhysRevD.87.032002@descriptionEnd@-,-@linkBegin@https://prd.aps.org/abstract/PRD/v87/i3/e032002@linkEnd@Phys. Rev. D 87, 032002 (2013)@descriptionEnd@','publicationType':'PAPER','pressStatement':''},{'publicationId':'574','internalLink':'https://atlas-glance.cern.ch/atlas/analysis/papers/details.php?id=574','shortTitle':'b cross-section from D*mu events','fullTitle':'Measurement of the b-hadron production cross section using decays to D*muX final states in pp collisions at sqrt(s) = 7 TeV with the ATLAS detector','pubShortTitle':'$b$-hadron cross-section with $D^{*}\\mu$ in 7 TeV pp','refCode':'BPHY-2011-02','abstract':'The b-hadron production cross section is measured with the ATLAS detector in pp collisions at sqrt(s) = 7 TeV, using 3.3 pb^-1 of integrated luminosity, collected during the 2010 LHC run. The b-hadrons are selected by partially reconstructing D*muX final states. Differential cross sections are measured as functions of the transverse momentum and pseudorapidity. The measured production cross section for a b-hadron with pT>9 GeV and |eta|<2.5 is 32.7 pm 0.8 (stat) ^{+4.5}_{-6.8} (syst) ub, higher than the next-to-leading-order QCD predictions but consistent within the experimental and theoretical uncertainties.','cdsLink':'','journal':'NPB','journalSub':'14-JUN-12','ecm':'7','luminosity':'3.3 pb-1','keywords':'7 TeV,Secondary vertices,Differential measurement,Cross-section measurement,b-hadron,1 lepton','links':'@linkBegin@https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/BPHY-2011-02/@linkEnd@Documents@descriptionEnd@,@linkBegin@https://arxiv.org/abs/1206.3122@linkEnd@1206.3122[hep-ex]@descriptionEnd@,@linkBegin@https://inspirehep.net/record/1118269@linkEnd@Inspire@descriptionEnd@
','run':'1','finalPubRef':'@linkBegin@https://dx.doi.org/10.1016/j.nuclphysb.2012.07.009@linkEnd@DOI:10.1016/j.nuclphysb.2012.07.009@descriptionEnd@-,-@linkBegin@https://www.sciencedirect.com/science/article/pii/S0550321312003926@linkEnd@Nucl. Phys. B 864 (2012) 341-381@descriptionEnd@','publicationType':'PAPER','pressStatement':''},{'publicationId':'1141','internalLink':'https://atlas-glance.cern.ch/atlas/analysis/papers/details.php?id=1141','shortTitle':'Bs->mumu','fullTitle':'Search for the decay $B_s^0 \\to \\mu^+ \\mu^-$ with the ATLAS detector','pubShortTitle':'Search for the decay $B_{s}\\rightarrow\\mu\\mu$','refCode':'BPHY-2011-04','abstract':'A blind analysis searching for the decay $B_s^0 \\to \\mu^+ \\mu^-$ has been performed using proton-proton collisions at a centre-of-mass energy of 7 TeV recorded with the ATLAS detector at the LHC. With an integrated luminosity of 2.4 fb^(-1) no excess of events over the background expectation is found and an upper limit is set on the branching fraction BR($B_s^0 \\to \\mu^+ \\mu^-$) < 2.2 (1.9) x10^(-8) at 95% (90%) confidence level.','cdsLink':'','journal':'PLB','journalSub':'03-APR-12','ecm':'7','luminosity':'2.4 fb-1','keywords':'7 TeV,Rare decays,Branching fraction measurements,Muon pairs,FCNC,b-hadron,2 leptons','links':'@linkBegin@https://arxiv.org/abs/1204.0735@linkEnd@1204.0735[hep-ex]@descriptionEnd@,@linkBegin@https://inspirehep.net/record/1102909@linkEnd@Inspire@descriptionEnd@
','run':'1','finalPubRef':'@linkBegin@https://dx.doi.org/10.1016/j.physletb.2012.06.013@linkEnd@DOI:10.1016/j.physletb.2012.06.013@descriptionEnd@-,-@linkBegin@https://www.sciencedirect.com/science/article/pii/S0370269312006399@linkEnd@Phys. Lett. B 713 (2012) 387-407@descriptionEnd@','publicationType':'PAPER','pressStatement':''},{'publicationId':'1541','internalLink':'https://atlas-glance.cern.ch/atlas/analysis/papers/details.php?id=1541','shortTitle':'Radiative ChiB decays','fullTitle':'Observation of a new chi_b state in radiative transitions to Upsilon(1S) and Upsilon(2S) at ATLAS','pubShortTitle':'Observation of $\\chi_{b}(3P)$ through radiative decays','refCode':'BPHY-2011-07','abstract':'The $\\chi_b$(nP) quarkonium states are produced in proton-proton collisions at the Large Hadron Collider (LHC) at $\\sqrt{s}$ = 7 TeV and recorded by the ATLAS detector. Using a data sample corresponding to an integrated luminosity of 4.4 fb$^{-1}$, these states are reconstructed through their radiative decays to $\\Upsilon$(1S,2S) with $\\Upsilon \\to \\mu^+ \\mu^-$. In addition to the mass peaks corresponding to the decay modes $\\chi_b(1P,2P) \\to \\Upsilon(1S)\\gamma$, a new structure centered at a mass of 10.539+/-0.004 (stat.)+/-0.008 (syst.) GeV is also observed, in both the $\\Upsilon(1S)\\gamma$ and $\\Upsilon(2S)\\gamma$ decay modes. This is interpreted as the $\\chi_b$(3P) system.','cdsLink':'','journal':'PRL','journalSub':'21-DEC-11','ecm':'7','luminosity':'5 fb-1','keywords':'7 TeV,Spectroscopy,Quarkonium,Radiative decays,Prompt production,Mass measurement,Photon,Photons,2 leptons','links':'@linkBegin@https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/BPHY-2011-07/@linkEnd@Documents@descriptionEnd@,@linkBegin@https://arxiv.org/abs/1112.5154@linkEnd@1112.5154[hep-ex]@descriptionEnd@,@linkBegin@https://inspirehep.net/record/1082461@linkEnd@Inspire@descriptionEnd@
','run':'1','finalPubRef':'@linkBegin@https://dx.doi.org/10.1103/PhysRevLett.108.152001@linkEnd@DOI:10.1103/PhysRevLett.108.152001@descriptionEnd@-,-@linkBegin@https://link.aps.org/doi/10.1103/PhysRevLett.108.152001@linkEnd@Phys. Rev. Lett. 108 (2012) 152001@descriptionEnd@','publicationType':'PAPER','pressStatement':''},{'publicationId':'141','internalLink':'https://atlas-glance.cern.ch/atlas/analysis/papers/details.php?id=141','shortTitle':'Upsilon production cross section 7!TeV','fullTitle':'$\\Upsilon(1S)$ differential production cross section','pubShortTitle':'$\\Upsilon(1S)$ production pp 7 TeV','refCode':'BPHY-2011-01','abstract':'A measurement of the cross-section for Upsilon(1S) -> mu+mu- production in proton-proton collisions at centre of mass energy of 7 TeV is presented. The cross-section is measured as a function of the Upsilon(1S) transverse momentum in two bins of rapidity, |y(Upsilon1S)| < 1.2 and 1.2 < |y(Upsilon1S)| < 2.4. The measurement requires that both muons have transverse momentum pT(mu) > 4 GeV and pseudorapidity |eta(mu)| < 2.5 in order to reduce theoretical uncertainties on the acceptance, which depend on the poorly known polarization. The results are based on an integrated luminosity of 1.13 pb-1, collected with the ATLAS detector at the Large Hadron Collider. The cross-section measurement is compared to theoretical predictions: it agrees to within a factor of two with a prediction based on the NRQCD model including colour-singlet and colour-octet matrix elements as implemented in PYTHIA while it disagrees by up to a factor of ten with the next-to-leading order prediction based on the colour-singlet-model.','cdsLink':'','journal':'PLB','journalSub':'27-JUN-11','ecm':'7','luminosity':'1 pb-1','keywords':'7 TeV,Quarkonium,Muon pairs,Prompt production,Differential measurement,Cross-section measurement,2 leptons','links':'@linkBegin@https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/BPHY-2011-01@linkEnd@Documents@descriptionEnd@,@linkBegin@https://arxiv.org/abs/1106.5325@linkEnd@1106.5325@descriptionEnd@,@linkBegin@https://inspirehep.net/record/915921@linkEnd@Inspire@descriptionEnd@
','run':'1','finalPubRef':'@linkBegin@https://doi.org/10.1016/j.physletb.2011.09.093@linkEnd@DOI:10.1016/j.physletb.2011.09.093@descriptionEnd@-,-@linkBegin@https://www.sciencedirect.com/science/article/pii/S0370269311011920@linkEnd@Phys.Lett. B 705 (2011) 9@descriptionEnd@','publicationType':'PAPER','pressStatement':''},{'publicationId':'2','internalLink':'https://atlas-glance.cern.ch/atlas/analysis/papers/details.php?id=2','shortTitle':'$J/\\psi$ cross sections','fullTitle':'Measurement of the differential cross-sections of inclusive, prompt and non-prompt J/$\\psi$ production in proton-proton collisions at $\\sqrt{s}$ = 7 TeV','pubShortTitle':'$J/\\psi$ production at pp 7 TeV','refCode':'BPHY-2010-01','abstract':'The inclusive J/psi production cross-section and fraction of J/psi mesons produced in B-hadron decays are measured in proton-proton collisions at sqrt(s) = 7 TeV with the ATLAS detector at the LHC, as a function of the transverse momentum and rapidity of the J/psi, using 2.3 pb-1 of integrated luminosity. The cross-section is measured from a minimum pT of 1 GeV to a maximum of 70 GeV and for rapidities within |y| < 2.4 giving the widest reach of any measurement of J/psi production to date. The differential production cross-sections of prompt and non-prompt J/psi are separately determined and are compared to Colour Singlet NNLO*, Colour Evaporation Model, and FONLL predictions.','cdsLink':'','journal':'NPB','journalSub':'15-APR-11','ecm':'7','luminosity':'2.4 pb-1','keywords':'7 TeV,Quarkonium,Muon pairs,Non-prompt production,Prompt production,Inclusive production,Differential measurement,Cross-section measurement,2 leptons','links':'@linkBegin@https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/BPHY-2010-01@linkEnd@Documents@descriptionEnd@,@linkBegin@https://arxiv.org/abs/1104.3038@linkEnd@1104.3038@descriptionEnd@,@linkBegin@https://inspirehep.net/record/896268@linkEnd@Inspire@descriptionEnd@
','run':'1','finalPubRef':'@linkBegin@https://dx.doi.org/10.1016/j.nuclphysb.2011.05.015@linkEnd@DOI:10.1016/j.nuclphysb.2011.05.015@descriptionEnd@-,-@linkBegin@https://www.sciencedirect.com/science/article/pii/S0550321311002938@linkEnd@Nucl.%20Phys.%20B%20850%20(2011)%20387-444@descriptionEnd@','publicationType':'PAPER','pressStatement':''},{'publicationId':'12607','internalLink':'https://atlas-glance.cern.ch/atlas/analysis/confnotes/details.php?id=12607','shortTitle':'B0(s) to mumu LHC combination','fullTitle':'Combination of the ATLAS, CMS and LHCb results on the $B^0_{(s)}\\to\\mu^+\\mu^-$ decays.','pubShortTitle':'B0(s) to mumu LHC combination','refCode':'ATLAS-CONF-2020-049','abstract':'A combination of results on the rare $B^0_s \\to \\mu^+\\mu^-$ and $B^0 \\to \\mu^+\\mu^-$ decays from the ATLAS, CMS, and LHCb experiments using data collected at the Large Hadron Collider between 2011 and 2016, is presented. The $B^0_s \\to \\mu^+\\mu^-$ branching fraction is obtained to be $(2.69\\,^{+\\, 0.37}_{-\\, 0.35}) \\times 10^{-9}$ and the effective lifetime of the $B^0_s \\to \\mu^+\\mu^-$ decay is measured to be $\\tau_{B^0_s \\to \\mu^+\\mu^- } = 1.91^{+0.37}_{-0.35}$ ps. An upper limit on the $B^0 \\to \\mu^+\\mu^-$ branching fraction is evaluated to be $\\mathcal{B}(B^0 \\to \\mu^+\\mu^-) < 1.6~(1.9)\\times 10^{-10}$ at $90\\%$ ($95\\%$) confidence level. An upper limit on the ratio of the $B^0 \\to \\mu^+\\mu^-$ and $B^0_s \\to \\mu^+\\mu^-$ branching fractions is obtained to be $0.052~(0.060)$ at $90\\%$ ($95\\%$) confidence level.','cdsLink':'https://cds.cern.ch/record/2727216','journal':'Preliminary','journalSub':'04-AUG-20','ecm':'13','luminosity':'36.2 fb-1','keywords':'2 leptons,Rare decays,Branching fraction measurements,Muon pairs,FCNC,Statistical combination,b-hadron','links':'@linkBegin@https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/CONFNOTES/ATLAS-CONF-2020-049@linkEnd@Documents@descriptionEnd@
','run':'2','finalPubRef':'@linkBegin@https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/CONFNOTES/ATLAS-CONF-2020-049@linkEnd@Figures@descriptionEnd@','publicationType':'CONF','pressStatement':''},{'publicationId':'11969','internalLink':'https://atlas-glance.cern.ch/atlas/analysis/confnotes/details.php?id=11969','shortTitle':'J/psi and psi(2S) cross-section high pT','fullTitle':'J/psi and psi(2S) differential cross-sections at high pT','pubShortTitle':'J/psi and psi(2S) differential cross-sections at high pT','refCode':'ATLAS-CONF-2019-047','abstract':'The measurements of the prompt and non-prompt differential cross-sections of $J/\\psi$ and $\\psi(2\\mathrm{S})$ mesons with $p_{T}$ between 60 and 360 GeV and rapidity range $|y|<2$ are reported. Furthermore, the measurements of the non-prompt fractions of $\\psi(2S)$ and $J/\\psi$, and prompt and non-prompt production ratios of $\\psi(2S)$ to $J/\\psi$ are presented. The analysis is performed using $pp$ collision data recorded by the ATLAS detector at $\\sqrt{s}=13$ TeC collected between 2015 and 2018, corresponding to $139$~fb$^{-1}$ of integrated luminosity.','cdsLink':'https://cds.cern.ch/record/2693955','journal':'Preliminary','journalSub':'30-SEP-19','ecm':'13','luminosity':'139 fb-1','keywords':'13 TeV,Quarkonium,Muon pairs,Non-prompt production,Prompt production,Differential measurement,Cross-section measurement,2 leptons','links':'@linkBegin@https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/CONFNOTES/ATLAS-CONF-2019-047/@linkEnd@Documents@descriptionEnd@
','run':'2','finalPubRef':'@linkBegin@https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/CONFNOTES/ATLAS-CONF-2019-047/@linkEnd@Figures@descriptionEnd@','publicationType':'CONF','pressStatement':''},{'publicationId':'11972','internalLink':'https://atlas-glance.cern.ch/atlas/analysis/confnotes/details.php?id=11972','shortTitle':'Searches for pentaquarks on Run1','fullTitle':'Study of $J/\\psi p$ resonances in the $\\Lambda^0_b \\rightarrow J/\\psi pK^-$ decays in $pp$ collisions at $\\sqrt{s}$= 7 and 8!TeV with the ATLAS detector','pubShortTitle':'Searches for pentaquarks using Run-1 data','refCode':'ATLAS-CONF-2019-048','abstract':'A study of $J/\\psi p$ resonances in the $Î›^0_bâ†’J/\\psi pK^âˆ’$ decays with large $m(pK^-)$ invariant masses by the ATLAS experiment at the LHC is presented. The analysis is based on a combined sample of $pp$ collision data at centre-of-mass energies $\\sqrt{s}$= 7TeV and 8TeV corresponding to integrated luminosities of $4.9fb^{âˆ’1}$ and $20.6fb^{âˆ’1}$, respectively. Although the data prefer the model with two or more pentaquark states, the model without pentaquarks is not excluded. The pentaquark masses and widths obtained using the model with two pentaquarks are consistent with those from the LHCb experiment.','cdsLink':'https://cds.cern.ch/record/2693957','journal':'Preliminary','journalSub':'02-OCT-19','ecm':'7, 8','luminosity':'4.9 fb-1, 20.6 fb-1','keywords':'7 TeV,B-physics and light states trigger,Exotic states,Spectroscopy,Secondary vertices,Mass measurement,b-hadron,2 leptons,Charged tracks,8 TeV','links':'@linkBegin@https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/CONFNOTES/ATLAS-CONF-2019-048@linkEnd@Documents@descriptionEnd@
','run':'1; 1','finalPubRef':'@linkBegin@https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/CONFNOTES/ATLAS-CONF-2019-048@linkEnd@Figures@descriptionEnd@','publicationType':'CONF','pressStatement':''},{'publicationId':'7647','internalLink':'https://atlas-glance.cern.ch/atlas/analysis/confnotes/details.php?id=7647','shortTitle':'13 TeV Bplus performance','fullTitle':'Studies of B+ mass performance with 13 TeV pp data','pubShortTitle':'$B^{\\pm}$ performance at 13 TeV','refCode':'ATLAS-CONF-2015-064','abstract':'The performance of the ATLAS detector in reconstructing $B^\\pm$ candidates is tested using 3.2 fb$^{âˆ’1}$ of $pp$ collision data from the LHC at a centre of mass energy of 13 TeV. The $B^\\pm$ invariant mass is determined via the $B^\\pm\\to J/\\psi(\\mu^+\\mu^-)K^\\pm$ decay. The $B^\\pm$ mass is extracted in several rapidity intervals and used to test the momentum calibration of Inner Detector tracking at low-to-medium transverse momentum ($p_T$) values. This study of the Inner Detector performance is a necessary prerequisite to future $B$-physics analyses with the ATLAS detector as the tracking performance determines the precision of these measurements.','cdsLink':'https://cds.cern.ch/record/2114830','journal':'Preliminary','journalSub':'14-DEC-15','ecm':'13','luminosity':'3.2 fb-1','keywords':'13 TeV,Lifetime measurements,Mass measurement,b-hadron,2 leptons,Charged tracks','links':'@linkBegin@https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/CONFNOTES/ATLAS-CONF-2015-064@linkEnd@Documents@descriptionEnd@
','run':'2','finalPubRef':'@linkBegin@https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/CONFNOTES/ATLAS-CONF-2015-064@linkEnd@Figures@descriptionEnd@','publicationType':'CONF','pressStatement':''},{'publicationId':'7567','internalLink':'https://atlas-glance.cern.ch/atlas/analysis/confnotes/details.php?id=7567','shortTitle':'13 TeV early Jpsi cross section','fullTitle':'Measurement of the differential non-prompt J/psi production fraction sqrt{s } = 13 TeV pp collisions at the ATLAS experiment','pubShortTitle':'Non-prompt fraction of $J/\\psi$ production at 13 TeV','refCode':'ATLAS-CONF-2015-030','abstract':'The non-prompt $J/\\psi$ production fraction $\\sigma(pp\\to b + X\\to J/\\psi+X^{\\prime})/\\sigma(pp\\to J/\\psi+X^{\\prime})$ is measured in proton-proton collisions at a centre-of-mass energy of $13\\,\\mathrm{TeV}$ with a data sample corresponding to an integrated luminosity of $6.4\\,\\mathrm{pb}^{-1}$ recorded by the ATLAS experiment at the Large Hadron Collider during June 2015. The measurement is performed differentially as a function of the $J/\\psi$ transverse momentum and rapidity, using the di-muon decay mode. Results are compared to equivalent measurements made at lower centre-of-mass energies.','cdsLink':'https://cds.cern.ch/record/2037967','journal':'Preliminary','journalSub':'21-JUL-15','ecm':'13','luminosity':'6.4 pb-1','keywords':'13 TeV,Muon pairs,Quarkonium,Non-prompt production,Prompt production,Differential measurement,Cross-section measurement,2 leptons','links':'@linkBegin@https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/CONFNOTES/ATLAS-CONF-2015-030@linkEnd@Documents@descriptionEnd@
','run':'2','finalPubRef':'@linkBegin@https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/CONFNOTES/ATLAS-CONF-2015-030@linkEnd@Figures@descriptionEnd@','publicationType':'CONF','pressStatement':''},{'publicationId':'5765','internalLink':'https://atlas-glance.cern.ch/atlas/analysis/confnotes/details.php?id=5765','shortTitle':'Bs decay to muon pairs full2011','fullTitle':'Search for the decay $B_s \\to \\mu^+ \\mu^-$ with the full 2011 data sample (Note: this conf-note replaces BPHY-2012-01)','pubShortTitle':'Search for the decay $B_s \\to \\mu^+ \\mu^-$ with the full 2011 data sample','refCode':'ATLAS-CONF-2013-076','abstract':'This note documents the ATLAS analysis searching for $B_s^0 \\to \\mu^+\\mu^-$ decays with an integrated luminosity of 4.9 fb$^{-1}$, corresponding to the full 2011 proton-proton dataset. This analysis supersedes the previous result based on 2.4 fb$^{-1}$. We derive a limit on ${\\cal B}(B_s^0 \\to \\mu^+ \\mu^-) <1.5\\;(1.2) \\times 10^{-8}$ at 95% (90%) CL.','cdsLink':'https://cds.cern.ch/record/1562934','journal':'Preliminary','journalSub':'16-JUL-13','ecm':'7 ','luminosity':'4.9 fb-1','keywords':'7 TeV,Rare decays,Branching fraction measurements,Muon pairs,FCNC,b-hadron,2 leptons','links':'@linkBegin@http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/CONFNOTES/ATLAS-CONF-2013-076@linkEnd@Documents@descriptionEnd@
','run':'1','finalPubRef':'@linkBegin@http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/CONFNOTES/ATLAS-CONF-2013-076@linkEnd@Figures@descriptionEnd@','publicationType':'CONF','pressStatement':''},{'publicationId':'3385','internalLink':'https://atlas-glance.cern.ch/atlas/analysis/confnotes/details.php?id=3385','shortTitle':'LHC combined limit in $B_{s}\\to\\mu\\mu$','fullTitle':'Combined limit of ATLAS, CMS and LHCb to the decay fraction Bs->mumu. (2.4 fb-1 used by ATLAS.)','pubShortTitle':'LHC combined limit in $B_{s}\\rightarrow \\mu\\mu$','refCode':'ATLAS-CONF-2012-061','abstract':'A combination of the results of the search for the decay $B_{q} \\rightarrow \\mu^{+}\\mu^{-}$ is performed using about 2.4 fb$^{-1}$, 5 fb$^{-1}$ and 1.0 fb$^{-1}$ of $pp$ collisions at $\\sqrt{s}$ = 7~TeV, collected at the Large Hadron Collider at CERN by the ATLAS, CMS, and LHCb experiments, respectively. The observed candidates in the three experiments are consistent with the expectation from the sum of background and Standard Model signal processes within 1$\\sigma$. The combination results in upper limits on the branching fractions, $B(B_{s} \\rightarrow \\mu^{+}\\mu^{-}) < 4.2 \\times 10^{-9}$ and $B(B_{d} \\rightarrow \\mu^{+}\\mu^{-}) < 8.1 \\times 10^{-10}$ both at 95% confidence level.','cdsLink':'https://cds.cern.ch/record/1456262','journal':'Preliminary','journalSub':'18-JUN-12','ecm':'7','luminosity':'2.4 fb-1','keywords':'7 TeV,Rare decays,Branching fraction measurements,Muon pairs,FCNC,Statistical combination,b-hadron,2 leptons','links':'@linkBegin@https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/CONFNOTES/ATLAS-CONF-2012-061/@linkEnd@Documents@descriptionEnd@
','run':'1','finalPubRef':'@linkBegin@https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/CONFNOTES/ATLAS-CONF-2012-061/@linkEnd@Figures@descriptionEnd@','publicationType':'CONF','pressStatement':''},{'publicationId':'2241','internalLink':'https://atlas-glance.cern.ch/atlas/analysis/confnotes/details.php?id=2241','shortTitle':'Bc->J/psi pi observation','fullTitle':'Observation of Bc meson in the decay Bc -> J/psi(mu+mu-) pi with the ATLAS detector at the LHC','pubShortTitle':'Observation of $B_{c}\\rightarrow J/\\psi \\pi$','refCode':'ATLAS-CONF-2012-028','abstract':'The production of $B^{\\pm}_c$ mesons is observed with the ATLAS detector at the LHC through their decay into $J/\\psi(\\mu^+\\mu^-)\\pi^{\\pm}$, using 4.3 fb$^{-1}$ of data from 7 TeV $pp$ collisions. The resulting $B^{\\pm}_c$ mass distribution is fitted with an unbinned maximum likelihood fit. The fit yields 82$\\pm$17 (stat.) signal events after background subtraction, with a fitted mass of 6282$\\pm$7 (stat.) MeV. The mass value is consistent with the world average value $m_{B_c}=$ 6277$\\pm$6 MeV.','cdsLink':'https://cds.cern.ch/record/1430737','journal':'Preliminary','journalSub':'07-MAR-12','ecm':'7','luminosity':'4.3 fb-1','keywords':'Charged tracks,7 TeV,Spectroscopy,Mass measurement,c-hadron,b-hadron,2 leptons','links':'@linkBegin@https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/CONFNOTES/ATLAS-CONF-2012-028@linkEnd@Documents@descriptionEnd@
','run':'1','finalPubRef':'@linkBegin@https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/CONFNOTES/ATLAS-CONF-2011-145/@linkEnd@Figures@descriptionEnd@','publicationType':'CONF','pressStatement':''},{'publicationId':'1941','internalLink':'https://atlas-glance.cern.ch/atlas/analysis/confnotes/details.php?id=1941','shortTitle':'!LambdaB signal','fullTitle':'Observation of decays of LambdaB to J/psi Lambda0 in ATLAS','pubShortTitle':'Observation of $\\Lambda_{b}$','refCode':'ATLAS-CONF-2011-124','abstract':'The production of $\\Lambda_b^0$ baryons is observed with the ATLAS experiment at the LHC through their decays $\\Lambda_b^0\\to J/\\psi(\\mu^+\\mu^-) \\Lambda^0 (p^+\\pi^-)$. The decays are reconstructed in 1.2 fb$^{-1}$ of the 2011 LHC data. The mass fit yields $579 \\pm 31(\\rm stat.)$ signal events and the fitted $\\Lambda_b^0$ mass value, $M = 5620.6 \\pm 1.6(\\rm stat.)$ MeV, is consistent with the world average value, $M_{\\Lambda_b^0 } = 5620.2 \\pm 1.6$ MeV.','cdsLink':'https://cds.cern.ch/record/1378514','journal':'Preliminary','journalSub':'26-AUG-11','ecm':'7 ','luminosity':'1.2 fb-1','keywords':'7 TeV,Spectroscopy,Mass measurement,b-hadron,2 leptons,Charged tracks','links':'@linkBegin@https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/CONFNOTES/ATLAS-CONF-2011-124/@linkEnd@Documents@descriptionEnd@
','run':'1','finalPubRef':'@linkBegin@https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/CONFNOTES/ATLAS-CONF-2011-124/@linkEnd@Figures@descriptionEnd@','publicationType':'CONF','pressStatement':''},{'publicationId':'1521','internalLink':'https://atlas-glance.cern.ch/atlas/analysis/confnotes/details.php?id=1521','shortTitle':'chic','fullTitle':'Observation of the chi_c(1P) charmonium states in pp collisions atsqrt(s) = 7 TeV at the ATLAS experiment','pubShortTitle':'Observation of $\\chi_{c1,2}$ through radiative decays','refCode':'ATLAS-CONF-2011-136','abstract':'We present the observation of the Ï‡c1 (1P) and Ï‡c2 (1P) charmonium states in Ï‡c â†’ J/Ïˆ Î³ decays in ATLAS using pp collision data at a center-of-mass energy of 7 TeV corresponding to an integrated luminosity of 39 pbâˆ’1. J/Ïˆ candidates are reconstructed from the decay J/Ïˆ â†’ Î¼+Î¼âˆ’ while photons are reconstructed with a calorimetric measurements. Ï‡c candidates are observed in the kinematic range pT(Ï‡c) > 10 GeV and rapidity |y(Ï‡c)| < 2.4. An extended unbinned maximum likelihood fit is performed to the invariant mass difference of the Î¼+Î¼âˆ’ and Î¼+Î¼âˆ’Î³ systems to yield 2960 Â± 120 (stat.) Â± 90 (syst.) Ï‡c1 and Ï‡c2 candidates.','cdsLink':'https://cds.cern.ch/record/1383839','journal':'Preliminary','journalSub':'25-AUG-11','ecm':'7 ','luminosity':'39 pb-1','keywords':'7 TeV,Spectroscopy,Quarkonium,Radiative decays,Photons,2 leptons','links':'@linkBegin@https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/CONFNOTES/ATLAS-CONF-2011-136/@linkEnd@Documents@descriptionEnd@
','run':'1','finalPubRef':'@linkBegin@https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/CONFNOTES/ATLAS-CONF-2011-136/@linkEnd@Figures@descriptionEnd@','publicationType':'CONF','pressStatement':''},{'publicationId':'1381','internalLink':'https://atlas-glance.cern.ch/atlas/analysis/confnotes/details.php?id=1381','shortTitle':'Bd->Jpsi Kshort signal','fullTitle':'Observation of the Bd->J/psi(mumu)Kshort(pipi) decay with the ATLAS experiment at the LHC','pubShortTitle':'Observation of $B_{d}\\rightarrow J/\\psi K_{S}$','refCode':'ATLAS-CONF-2011-105','abstract':'The production of $B_d^0$ mesons is observed with the ATLAS experiment at the LHC through their decays to $B_d^0 \\to J/\\psi(\\mu^+\\mu^-) K^0_S(\\pi^+\\pi^-)$. The decays are reconstructed in 40 pb$^{-1}$ of data taken in 2010 and the mass distribution obtained is fitted using an unbinned maximum likelihood fit. The mass fit yields $616 \\pm 30(\\rm stat.)$ signal events. The fitted $B_d^0$ mass value, $M = 5279.7 \\pm 1.0(\\rm stat.)$ MeV, is consistent with the world average value, $M_{B^0 } = 5279.50 \\pm 0.30$ MeV.','cdsLink':'https://cds.cern.ch/record/1369830','journal':'Preliminary','journalSub':'20-JUL-11','ecm':'7 ','luminosity':'40 pb-1','keywords':'7 TeV,Secondary vertices,Mass measurement,b-hadron,2 leptons,Charged tracks','links':'@linkBegin@https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/CONFNOTES/ATLAS-CONF-2011-105/@linkEnd@Documents@descriptionEnd@
','run':'1','finalPubRef':'@linkBegin@https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/CONFNOTES/ATLAS-CONF-2011-105/@linkEnd@Figures@descriptionEnd@','publicationType':'CONF','pressStatement':''},{'publicationId':'1321','internalLink':'https://atlas-glance.cern.ch/atlas/analysis/confnotes/details.php?id=1321','shortTitle':'Bs and Bd lifetimes','fullTitle':'Bs and Bd lifetimes extracted from the exclusive decays Bd->J/psi K* and Bs->J/psi phi in ATLAS','pubShortTitle':'$B_{d}$ and $B_{s}$ lifetime','refCode':'ATLAS-CONF-2011-092','abstract':'The lifetimes of B0 and B0 mesons are determined from their decays Bd0 â†’ J/ÏˆKâˆ—0 and Bs0 â†’J/ÏˆÏ† reconstructed in ATLAS using the pp collisions data at acenter-of-mass energy of 7 TeV corresponding to an integrated luminosity of 40 pbâˆ’1. For Bd0 meson the lifetime extracted from fit is Ï„Bd 1.51 Â± 0.04 (stat) Â± 0.04 (syst) ps. For the Bs meson the fitted (single) lifetime is Ï„Bs single =1.41 Â± 0.08 (stat) Â± 0.04 (syst) ps. Within the uncertainties, the fitted lifetimes of both B mesons are consistent with the world average values.','cdsLink':'https://cds.cern.ch/record/1363779','journal':'Preliminary','journalSub':'05-JUL-11','ecm':'7 ','luminosity':'40 pb-1','keywords':'7 TeV,Lifetime measurements,b-hadron,2 leptons,Charged tracks','links':'@linkBegin@https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/CONFNOTES/ATLAS-CONF-2011-092/@linkEnd@Documents@descriptionEnd@ ','run':'1','finalPubRef':'@linkBegin@https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/CONFNOTES/ATLAS-CONF-2011-092/@linkEnd@Figures@descriptionEnd@','publicationType':'CONF','pressStatement':''},{'publicationId':'722','internalLink':'https://atlas-glance.cern.ch/atlas/analysis/confnotes/details.php?id=722','shortTitle':'Bs and Bd decay observation','fullTitle':'Observation of the Bd and Bs mesons in the decays Bd →J/ψK0* and Bs→J/ψφ in ATLAS','pubShortTitle':'Observation of $B_{d}$ and $B_{s}$ mesons','refCode':'ATLAS-CONF-2011-050','abstract':'The production of B0d and B0s mesons is observed in ATLAS through their decays B0d â†’ J/Ïˆ Kâˆ—0 and B0sâ†’J/ÏˆÏ† . Presented results are based on the analysis of pp collisions at a center-of-mass energy of 7 TeV corresponding to an integrated luminosity of 40.3 pbâˆ’1. A total of 2340 Â± 80 (stat) B0d signal decays are observed after subtracting the background, with a fitted mass of 5279.6 Â± 0.9 (stat) MeV. For the B0s signal 358 Â± 22 (stat) decays are observed, with a fitted mass of 5364.0 Â± 1.4 (stat) MeV. Within the statistical uncertainties, the fitted masses of both B mesons are consistent with the world average values.','cdsLink':'https://cds.cern.ch/record/1341815','journal':'Preliminary','journalSub':'01-APR-11','ecm':'7 ','luminosity':'40.3 pb-1','keywords':'7 TeV,Spectroscopy,Mass measurement,b-hadron,2 leptons,Charged tracks','links':'@linkBegin@https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/CONFNOTES/ATLAS-CONF-2011-050/@linkEnd@Documents@descriptionEnd@ ','run':'1','finalPubRef':'@linkBegin@https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/CONFNOTES/ATLAS-CONF-2011-050/@linkEnd@Figures@descriptionEnd@','publicationType':'CONF','pressStatement':''},{'publicationId':'721','internalLink':'https://atlas-glance.cern.ch/atlas/analysis/confnotes/details.php?id=721','shortTitle':'Charmed meson production','fullTitle':'Measurement of $D^{( * )}$ meson production cross sections in pp collisions at $\\sqrt{s}$ 7 TeV with the ATLAS detector','pubShortTitle':'$D^{*}$ and $D^{\\pm}$ meson production','refCode':'ATLAS-CONF-2011-017','abstract':'The production of the D*+-, D+- and Ds+- charm mesons have been measured with the ATLAS detector in pp collisions at sqrt{s}= 7 TeV using an integrated luminosity of 1.1 nb^{-1}. The charmed mesons have been reconstructed in the range of transverse momentum p_T(D^( * ))>3.5 GeV and pseudorapidity |\\eta(D^( * ))|<2.1. The differential cross sections as a function of transverse momentum and pseudorapidity were measured for D*+- and D+- production. The NLO QCD predictions are consistent with the data in the visible kinematic region within the large theoretical uncertainties. Using the visible D^( * ) cross sections and an extrapolation to the full kinematic phase space, the total cross sections for D^( * ) meson production in charm hadronisation, the strangeness-suppression factor in charm fragmentation, the fraction of D mesons produced in a vector state, and the total cross section of charm production at LHC were calculated.','cdsLink':'https://cds.cern.ch/record/1336746','journal':'Preliminary','journalSub':'12-MAR-11','ecm':'7 ','luminosity':'1.1 nb-1','keywords':'7 TeV,Hadronic final states,Inclusive production,Differential measurement,Cross-section measurement,c-hadron,All hadronic','links':'@linkBegin@https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/CONFNOTES/ATLAS-CONF-2011-017@linkEnd@Documents@descriptionEnd@
','run':'1','finalPubRef':'@linkBegin@https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/CONFNOTES/ATLAS-CONF-2011-017@linkEnd@Figures@descriptionEnd@','publicationType':'CONF','pressStatement':''},{'publicationId':'421','internalLink':'https://atlas-glance.cern.ch/atlas/analysis/confnotes/details.php?id=421','shortTitle':'Observation of the B± meson in the decay B± → J/ψ (μ+μ−) K± in ATLAS','fullTitle':'Observation of the B± meson in the decay B± → J/ψ (μ+μ−) K± in ATLAS','pubShortTitle':'Observation of $B^{\\pm}\\rightarrow J/\\psi K^{\\pm}$','refCode':'ATLAS-CONF-2010-098','abstract':'The production of BÂ± mesons is observed in ATLAS through their decay to J/Ïˆ (Î¼+Î¼âˆ’)KÂ±, using 3.4 pbâˆ’1 of 7 TeV LHC collisions. A total of 283 Â± 22(stat.) signal decays are observed after subtracting the background, with a fitted mass of 5283.2 Â± 2.5(stat.) MeV. Within the statistical uncertainty, the fitted mass is consistent with the world average value.','cdsLink':'https://cds.cern.ch/record/1307530','journal':'Preliminary','journalSub':'16-NOV-10','ecm':'7 ','luminosity':'3.4 pb-1','keywords':'7 TeV,Mass measurement,b-hadron,2 leptons,Charged tracks','links':'@linkBegin@https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/CONFNOTES/ATLAS-CONF-2010-098/@linkEnd@Documents@descriptionEnd@
','run':'1','finalPubRef':'@linkBegin@https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/CONFNOTES/ATLAS-CONF-2010-098/@linkEnd@Figures@descriptionEnd@','publicationType':'CONF','pressStatement':''},{'publicationId':'53','internalLink':'https://atlas-glance.cern.ch/atlas/analysis/confnotes/details.php?id=53','shortTitle':'A first measurement of the differential cross-section for the J/ψ → μ+μ− resonance','fullTitle':'A first measurement of the differential cross-section for the J/ψ → μ+μ− resonance and the non-prompt to prompt J/ψ cross section ratio with pp collisions at √s = 7 TeV in ATLAS','pubShortTitle':'$J/\\psi\\rightarrow\\mu\\mu$ differential cross section','refCode':'ATLAS-CONF-2010-062','abstract':'The inclusive production of the $J/\\psi$ meson in its dimuon decay mode is studied in proton-proton collisions at $\\sqrt{s}$= 7 TeV with the ATLAS detector at the LHC. The double-differential cross section is measured with respect to the transverse momentum and rapidity of $J/\\psi$. The ratio of $J/\\psi$ mesons produced from B hadron decays to the $J/\\psi$ produced from prompt QCD sources is also measured as a function of $J/\\psi$ transverse momentum.','cdsLink':'https://cds.cern.ch/record/1281335','journal':'Preliminary','journalSub':'21-JUL-10','ecm':'7 ','luminosity':'17.5 nb-1','keywords':'7 TeV,Spectroscopy,Quarkonium,Muon pairs,Inclusive production,Differential measurement,Cross-section measurement,2 leptons','links':'@linkBegin@https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/CONFNOTES/ATLAS-CONF-2010-062/@linkEnd@Documents@descriptionEnd@
','run':'1','finalPubRef':'@linkBegin@https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/CONFNOTES/ATLAS-CONF-2010-062/@linkEnd@Figures@descriptionEnd@','publicationType':'CONF','pressStatement':''},{'publicationId':'47','internalLink':'https://atlas-glance.cern.ch/atlas/analysis/confnotes/details.php?id=47','shortTitle':'J/ψ Performance of the ATLAS ID','fullTitle':'J/ψ Performance of the ATLAS Inner Detector','pubShortTitle':'J/ψ Performance of the ATLAS Inner Detector','refCode':'ATLAS-CONF-2010-078','abstract':'A performance study of J/Ïˆ â†’ Î¼+Î¼âˆ’ decays is presented from 7 TeV proton-proton collisions using the ATLAS detector at the LHC with an integrated luminosity of 78 nbâˆ’1. The J/Ïˆ mass was extracted from the reconstructed di-muon invariant mass spectrum using track parameters determined from the ATLAS Inner Detector. The agreement with the PDG value of the reconstructed J/Ïˆ mass is within statistical uncertainties and provides a validation of the momentum scale determination in the low mass region. The mass resolution is compatible with Monte Carlo expectations. The kinematic properties of the J/Ïˆ candidates are presented and compared with Monte Carlo predictions. The reconstructed J/Ïˆ mass and mass resolution are compared in different detector regions.','cdsLink':'https://cds.cern.ch/record/1281369','journal':'Preliminary','journalSub':'21-JUL-10','ecm':'7','luminosity':'78 nb-1','keywords':'2 leptons,Tracking detector,7 TeV,Detector system performance,Quarkonium','links':'@linkBegin@https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/CONFNOTES/ATLAS-CONF-2010-078/@linkEnd@Documents@descriptionEnd@
','run':'1','finalPubRef':'@linkBegin@https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/CONFNOTES/ATLAS-CONF-2010-078/@linkEnd@Figures@descriptionEnd@','publicationType':'CONF','pressStatement':''},{'publicationId':'33','internalLink':'https://atlas-glance.cern.ch/atlas/analysis/confnotes/details.php?id=33','shortTitle':'Observation of $J/\\psi\\to\\mu\\mu$','fullTitle':'First observation of the $J/\\psi\\rightarrow\\mu\\mu$ resonance in ATLAS pp collisions at $\\sqrt{s } =$ = 7 TeV','pubShortTitle':'Observation of $J/\\psi\\rightarrow\\mu\\mu$ in pp at 7 TeV','refCode':'ATLAS-CONF-2010-045','abstract':'The first J/Ïˆ â†’ Î¼+Î¼âˆ’ observation using the ATLAS detector, in 7 TeV proton-proton collisions at the LHC, is reported for an integrated luminosity of approximately 6.4 nbâˆ’1. The reconstructed invariant mass agrees with the PDG value within statistical uncertainties, and the peak width is compatible with Monte Carlo expectations. The kinematic properties of the J/Ïˆ candidates are presented and compared with Monte Carlo data. The muon trigger and reconstruction efficiencies in this very low transverse momentum region are studied using the J/Ïˆ candidates.','cdsLink':'https://cds.cern.ch/record/1277685','journal':'Preliminary','journalSub':'07-JUN-10','ecm':'7','luminosity':'6.4 nb-1','keywords':'7 TeV,Spectroscopy,Quarkonium,Muon pairs,2 leptons','links':'@linkBegin@https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/CONFNOTES/ATLAS-CONF-2010-045/@linkEnd@Documents@descriptionEnd@
','run':'1','finalPubRef':'@linkBegin@https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/CONFNOTES/ATLAS-CONF-2010-045/@linkEnd@Figures@descriptionEnd@','publicationType':'CONF','pressStatement':''},{'publicationId':'30','internalLink':'https://atlas-glance.cern.ch/atlas/analysis/confnotes/details.php?id=30','shortTitle':'D* mesons reconstruction ','fullTitle':'D* mesons reconstruction in pp collisions at √s = 7 TeV','pubShortTitle':'D* mesons pp collisions at 7 TeV','refCode':'ATLAS-CONF-2010-034','abstract':'A study of D*+-, D+- and Ds+- reconstruction with the ATLAS detector in pp collisions at sqrt{s}= 7 TeV is presented. The used data sample collected in March-April of 2010 with the unprescaled minimum-bias triggers corresponds to 0.37 nb^{-1} of integrated luminosity. Reconstructed signals are compared with results of Monte Carlo simulation.','cdsLink':'https://cds.cern.ch/record/1277669','journal':'Preliminary','journalSub':'05-JUN-10','ecm':'7','luminosity':'','keywords':'Inclusive production','links':'@linkBegin@https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/CONFNOTES/ATLAS-CONF-2010-034/@linkEnd@Documents@descriptionEnd@
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