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B-Physics and Light States public results

Conveners: Umberto de Sanctis and James Walder

Publications

Publications appearing in or submitted to peer-reviewed journals are listed below.

Short Title Int L Journal Preprint Plots Preceding CONF-note
NEW Measurement of b-hadron pair production at √ s = 8 TeV 11.4 fb-1 Submitted to JHEP arXiv:1705.03374 Link -
NEW Measurement of the prompt J/ψ pair production cross-section in pp collisions at √ s = 8 TeV 11.4 fb-1 Eur. Phys. J. C77 (2017) 76 arXiv:1612.02950 Link ATLAS-CONF-2016-047
Production measurements of ψ(2S) and X(3872) → J/ψ π+π- at √s = 8 TeV 11.4 fb-1 JHEP01(2017)117 arXiv:1610.09303 Link ATLAS-CONF-2016-028
Measurement of the relative width difference of the B0-B0 system 25 fb-1 JHEP06 (2016) 081 arXiv:1605.07485 Link -
Study of the rare decays of B0s and B0 into muon pairs from data collected during the LHC Run 1 25 fb-1 Eur. Phys. J. C 76 (2016) 513 arXiv:1604.04263 Link -
Measurement of the CP-violating phase φs and the B0s meson decay width difference with B0s → J/ψ ϕ decays 14.3 fb-1 JHEP 1608 (2016) 147 arXiv:1601.03297 Link -
Measurement of the differential cross-sections of prompt and non-prompt production of J/ψ and ψ(2S) in pp collisions at √s = 7 and 8 TeV (2.1 + 11.4) fb-1 Eur.Phys.J. C76 (2016) 5, 283 arXiv:1512.03657 Link ATLAS-CONF-2015-024
Measurement of D*±, D± and Ds± meson production cross sections in pp collisions at √s = 7 TeV 280 nb-1 Nucl.Phys. B907 (2016) 717 arXiv:1512.02913 Link -
Determination of the ratio of b-quark fragmentation fractions fs / fd in pp collisions at √s = 7 TeV 2.47 fb-1 Phys. Rev. Lett. 115, 262001 (2015) arXiv:1507.08925 Link -
Measurement of the branching ratio Γ(Λ0b→ψ(2S) Λ0) / Γ(Λ0b→J/ψ Λ0) 20.6 fb-1 Physics Letters B 751 (2015) 63-80 arXiv:1507.08202 Link -
Study of the Bc+→J/ψ Ds+ and Bc+→J/ψ Ds*+ decays (4.9 + 20.6) fb-1 Eur. Phys. J. C, 76(1), 1 (2016) arXiv:1507.07099 Link ATLAS-CONF-2015-014
Observation and measurement of the production of prompt and non-prompt J/ψ mesons in association with a Z boson in pp collisions at √s = 8 TeV 20.3 fb-1 Eur. Phys. J. C75 (2015) 229 arXiv:1412.6428 Link -
Search for Xb and other hidden-beauty states using π+π-ϒ(1S) channel 16.2 fb-1 Phys. Lett. B740 (2015) 199-217 arXiv:1410.4409 Link -
Cross-section measurement of ψ(2S) → J/ψ (→ μ+μ-) π+π- at √s = 7 TeV 2.1 fb-1 JHEP 09 (2014) 079 arXiv:1407.5532 Link ATLAS-CONF-2013-094
φs and ΔΓs from flavour tagged time dependent angular analysis of B0s → J/ψ ϕ 4.9 fb-1 Phys. Rev. D 90 (2014) 052007 arXiv:1407.1796 Link ATLAS-CONF-2013-039
Observation of an excited B±c meson state (4.9 + 19.2) fb-1 Phys. Rev. Lett. 113 (2014) 212004 arXiv:1407.1032 Link -
Measurement of χc1 and χc2 production at √s = 7 TeV 4.5 fb-1 JHEP 07 (2014) 154 arXiv:1404.7035 Link ATLAS-CONF-2013-095
Parity violating asymmetry parameter αb and the helicity amplitudes for the decay Λb0→ J/ψ Λ0 4.6 fb-1 Phys. Rev. D 89 (2014) 092009 arXiv:1404.1071 Link ATLAS-CONF-2013-071
Associated production of prompt J/ψ mesons and W boson at √s = 7 TeV 4.5 fb-1 JHEP 04 (2014) 172 arXiv:1401.2831 Link ATLAS-CONF-2013-042
Measurement of the differential cross-section of B+ meson production in pp collisions at √s = 7 TeV 2.4 fb-1 JHEP 10 (2013) 042 arXiv:1307.0126 Link ATLAS-CONF-2013-008
Measurement of upsilon production in √s = 7 TeV pp collisions 1.8 fb-1 Phys. Rev. D 87 (2013) 052004 arXiv:1211.7255 Link -
Time-dependent angular analysis of the decay B0s → J/ψ ϕ and extraction of ΔΓs and the CP violating weak phase φs 4.9 fb-1 JHEP 12 (2012) 072 arXiv:1208.0572 Link -
Measurement of the Λb lifetime and mass 4.9 fb-1 Phys. Rev. D 87 (2013) 032002 arXiv:1207.2284 Link ATLAS-CONF-2012-055
Measurement of the b-hadron production cross-section using decays to D*+μ-X final states in pp collisions at 7 TeV 3.3 pb-1 Nucl. Phys. B 864 (2012) 341-381 arXiv:1206.3122 Link -
Search for the decay B0s → μ+μ- 2.4 fb-1 Phys. Lett. B713 (2012) 180-196 arXiv:1204.0735 Link ATLAS-CONF-2012-010
Observation of a new χb state in radiative transitions to ϒ(1S) and ϒ(2S) 4.4 fb-1 Phys. Rev. Lett. 108 (2012) 152001 arXiv:1112.5154 Link  
ϒ(1S) fiducial production cross-section 1.1 pb-1 Phys. Lett. B703 (2011) 428-446 arXiv:1106.5325 Link  
Differential cross-sections of inclusive, prompt and non-prompt J/ψ production 2.3 pb-1 Nucl. Phys. B 850 (2011) 387-344 arXiv:1104.3038 Link  
Analyses performed within other ATLAS Physics Groups:          
D*+/- production in jets 0.3 pb-1 Phys. Rev. D 85, 052005 (2012) arXiv:1112.4432 Link  
Inclusive production of electrons and muons (b/c cross section) 35 pb-1 Phys. Lett. B 707 (2012) 438-458 arXiv:1109.0525 Link  
Centrality dependence of J/ψ production in heavy ions collisions 6.7 μb-1 Phys. Lett. B 697 (2011) 294-312 arXiv:1012.5419 Link  

CONF notes

Notes containing preliminary or unpublished results based on data, the contents of which may be used in conference talks, are listed below.

Short Title Int L Ref./link to ATLAS public pages Plots
NEW Angular analysis of B0d → K* μ+μ- decays in pp collisions at √s = 8 TeV 20.3 fb-1 ATLAS-CONF-2017-023 Link
(Superseded) Measurement of the prompt J/ψ pair production cross-section in pp collisions at √s = 8 TeV 11.4 fb-1 ATLAS-CONF-2016-047 Link
(Superseded) Production measurements of ψ(2S) and X(3872) → J/ψ (→ μ+μ-) π+π- at √s = 8 TeV 11.4 fb-1 ATLAS-CONF-2016-028 Link
B± mass reconstruction in B± →J/ψ K± decay at 13 TeV $pp$ collisions 3.2 fb-1 ATLAS-CONF-2015-064 Link
Differential non-prompt J/ψ production fraction at √s = 13 TeV 6.4 pb-1 ATLAS-CONF-2015-030 Link
(Superseded) Differential cross-sections of prompt and non-prompt J/ψ and ψ(2S) at √s = 7 and 8 TeV 2.1 fb-1, 11.4 fb-1 ATLAS-CONF-2015-024 Link
(Superseded) Branching fractions of Bc+→J/ψDs+ and Bc+→J/ψDs*+ and transverse polarization fraction (4.9 + 20.6) fb-1 ATLAS-CONF-2015-014 Link
(Superseded) Measurement of χc1 and χc2 production at √s = 7TeV 4.5 fb-1 ATLAS-CONF-2013-095 Link
(Superseded) Cross-section measurement of ψ(2S) → J/ψ (→ μ+μ-) π+π- at √s = 7TeV 2.1 fb-1 ATLAS-CONF-2013-094 Link
(Superseded) Limit on B0s → μμ branching fraction based on 4.9 fb-1 of integrated luminosity 4.9 fb-1 ATLAS-CONF-2013-076 Link
(Superseded) Parity violating asymmetry parameter αb and the helicity amplitudes for the decay Λb0→ J/ψ Λ0 4.6 fb-1 ATLAS-CONF-2013-071 Link
(Superseded) Associated production of prompt J/ψ mesons and W boson in at √s = 7TeV 4.6 fb-1 ATLAS-CONF-2013-042 Link
(Superseded) φs and ΔΓs from flavor-tagged time-dependent angular analysis of B0s → J/ψ ϕ 4.9 fb-1 ATLAS-CONF-2013-039 Link
(Superseded) Production cross section of B+ at √s = 7TeV 2.4 fb-1 ATLAS-CONF-2013-008 Link
Combined LHC limit to the decay B0s → μμ (ATLAS-CMS-LHCb note) 2.4 - 5 - 1.0 fb-1 ATLAS-CONF-2012-061 Link
(Superseded) Measurement of the Λb lifetime and mass 4.9 fb-1 ATLAS-CONF-2012-055 Link
Observation of the B±c meson in the decay B±c→ J/ψ(μ+μ-) π± 4.3 fb-1 ATLAS-CONF-2012-028 Link
(Superseded) Search for the decay B0s → μμ with the ATLAS detector 2.4 fb-1 ATLAS-CONF-2012-010 Link
Measurement of the average B lifetime in inclusive B → J/ψ X → μ+μ X decays 35 pb-1 ATLAS-CONF-2011-145 Link
Observation of the decay Λb → J/ψ(μμ) Λ 1.2 fb-1 ATLAS-CONF-2011-124 Link
Observation of χc states through J/ψ γ transitions 40 pb-1 ATLAS-CONF-2011-136 Link
Observation of the decay B0d→J/ψ KS 40 pb-1 ATLAS-CONF-2011-105 Link
Measurement of the B0d and B0s lifetimes in the decays B0d→J/ψ K*0 and B0s→J/ψ ϕ 40 pb-1 ATLAS-CONF-2011-092 Link
Observation of the B0d and B0s mesons in the decays B0d→J/ψ K*0 and B0s→J/ψ ϕ 40 pb-1 ATLAS-CONF-2011-050 Link
Measurement of D* and D+ meson production cross sections at √s = 7TeV 1.1 nb-1 ATLAS-CONF-2011-017 Link
Observation of the B± meson in the decay B±→J/ψ(μ+μ-) K± 3.4 pb-1 ATLAS-CONF-2010-098 Link
J/ψ performance of the ATLAS Inner Detector 78 nb-1 ATLAS-CONF-2010-078 Link
(Preliminary) Measurement of the J/ψ → μμ differential cross section and fraction from B decays 19.5 nb-1 ATLAS-CONF-2010-062 Link
Observation of the J/ψ → μμ resonance 6.4 nb-1 ATLAS-CONF-2010-045 Link
D(*) mesons reconstruction in pp collisions at √s = 7TeV 0.37 nb-1 ATLAS-CONF-2010-034 Link

PUB notes

Notes based on published or preliminary public results, maybe discussing comparisons with theory or other measurements, or based on ATLAS Monte Carlo (such as feasibility studies), the contents of which may be used in conference talks, are listed below.

Short Title Int L Ref./link to ATLAS public pages Plots Enhancement of
ATLAS B-physics studies at increased LHC luminosity, potential for CP-violation measurement in the B0s → J/ψ ϕ decay (5-3000) fb-1 ATL-PHYS-PUB-2013-010 Link -
Comparison of D(*) production cross section at √s = 7TeV with FONLL and GM-VFNS predictions 1.1 nb-1 ATL-PHYS-PUB-2011-012 Link ATLAS-CONF-2011-017

Stand-alone plots

Short Title Int L / MC Plots More info (may be restricted)
NEW B0s proper decay time resolution in the B0s → J/ψ (μ+μ-) ϕ(K+K-) decay for Run 1, Run 2 and HL-LHC 2012, 2015 and 2016 data, HL-LHC simulation Link ATL-COM-PHYS-2016-1403; B0s → μ+μ- mass-resolution in ATL-PHYS-PUB-2016-026
J/ψ candidates in pp collisions at 13 TeV May 2015 commissioning data Link ATL-COM-PHYS-2015-458

The following Run-2 plots are produced with simple selections, explained in the figure caption.

Invariant mass distributions for oppositely charged muon candidate pairs that pass various triggers.
Events are reconstructed from pairs of muons passing "Tight" offline quality criteria, which are fit to a common vertex, using the inner detector track parameters, with a $\chi^{2} < 20$ for the one degree of freedom. Muons are also required to have an absolute pseudo rapidity less than 2.3, and have transverse momentum at least that of the trigger threshold (for the single-muon trigger the thresholds of 20 and 4 GeV are used). The dimuon triggers require two muons at L1, passing thresholds of $p_{\rm T} > 4$ or 6 GeV, which are confirmed at the HLT. Pairs of oppositely charged muons are fit to a common vertex, using the inner detector track parameters, and invariant mass requirements made to restrict events to the charmonium, b-hadron and bottomonium invariant mass ranges. For comparison, the lowest threshold unprescaled single muon trigger is shown. This single-muon trigger is required to pass the 15 GeV threshold at L1, and 20 GeV at the HLT. The yields of events collected for each trigger are overlaid, where overlapping events collected by multiple triggers are retained in each histogram; hence the integral of events from all histograms is greater than the total event yield. For certain periods of running, trigger prescales were applied, reducing the effective yield of events collected by those triggers. The supporting dimuon trigger, which covers the full mass range of interest was also prescaled throughout the period of running.
http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/BPHYSICS/PUBLIC/ATL-COM-DAQ-2016-005_dimuon_2015_mass_dist.png
APPROVED png file eps file

The following Run-1 plots are produced with simple selections, explained in the figure caption.

Di-muon invariant mass distributions for events collected in a single run by two trigger menus: muon stream and B-physics stream.Whilst the individual triggers dedicated to J/ψ→μμ, Υ→μμ and Bs→μμ in each menu are the same, the prescales in the B-physics stream are lower, leading to a higher yield of di-muons.This data sample was not reconstructed immediately but stored in raw form on disk until the long shutdown began. In this way the muon trigger output bandwidth was maximally used without overloading the reconstruction running during data taking.This “delayed stream” approach was used for the majority of 2012. http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/BPHYSICS/PUBLIC/208811_jpsi_allTrigs.png
APPROVED eps file
As above but for a specific trigger which requires two muons, both in the barrel region of the detector, both with pT greater than 4 GeV, and in the invariant mass range 2.5 < Mμμ < 4.2 GeV.The very large difference in yield is purely a function of the different prescales in the two menus. http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/BPHYSICS/PUBLIC/208811_jpsi_BB_log.png
APPROVED eps file
As above but for a specific trigger which requires two muons, both in the barrel region of the detector, both with pT greater than 4 GeV, and in the invariant mass range 2.5 < Mμμ < 4.2 GeV.The very large difference in yield is purely a function of the different prescales in the two menus. http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/BPHYSICS/PUBLIC/208811_jpsi_BB_lin.png
APPROVED eps file

Invariant mass of oppositely charged muon candidate pairs selected by a variety of triggers.
The trigger naming convention is explained as follows
  • EF_2mu4_ denotes two muon triggers at level 1, confirmed at the high level trigger, with both objects passing a threshold of 4 GeV
  • EF_mu4mu6_ denotes two muon triggers at level 1, confirmed at the high level trigger, with one objects passing a threshold of 4 and the other 6 GeV
  • EF_mu20 denotes a single muon trigger at level 1, confirmed at the high level trigger, passing a threshold of 20GeV
  • Jpsimumu, Bmumu, Upsimumu and DiMu denote coarse invariant mass windows in the regions of the J/ψ (2.5-4.3 GeV), Bs (4-8.5 GeV) and Upsilon (8-12 GeV) and the combined range of all three (1.5-14GeV) respectively, as calculated using the trigger objects

Events are separated into samples according to which of the above triggers they fire (if an event fires several triggers it appears in several samples). For each sample pairs of high-quality (“combined”) oppositely charged muons are sought in the offline reconstruction. For a given trigger sample the offline muon pair must pass the same pT cuts as are applied in the trigger. They must also have an absolute pseudorapidity < 2.3. The selected offline muons are not required to be matched to the trigger objects responsible for firing the trigger. For each muon pair passing the selections, the associated inner detector tracks are fitted to a common vertex. The invariant mass of each pair is calculated using the track parameters refitted by the vertexing, and a PDG muon mass hypothesis. For each trigger sample, the invariant masses are plotted in separate histograms, which are then overlaid on a single mass range. Note that the EF_2mu4_DiMu trigger was prescaled for some of the later data taking, which is why it collects fewer events. The integral of the histograms will be greater than the total number of candidates collected, since the different trigger samples overlap.

http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/BPHYSICS/PUBLIC/DiMu_mas_diff_Triggers.png
APPROVED eps file
As above in a narrower mass range http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/BPHYSICS/PUBLIC/DiMu_mas_diff_Triggers_BPhys_noLogX.png
APPROVED eps file

J/ψ and ψ(2s) candidates
J/ψ→μμ and ψ(2s)→μμ candidates; plot shows all oppositely charged di-muon pairs passing vertexing with invariant masses between 2.5 and 4.2 GeV. Events which fire any of the following triggers are accepted:
  • a single muon at level 1, confirmed at high-level trigger (HLT) with cuts of either 4, 6 or 10 GeV applied;
  • a single muon at L1, confirmed at HLT with cuts of either 4 or 6 GeV applied, and then a second muon found at HLT in the same region of interest (RoI) as the L1 muon. The two muons are required to be in the invariant mass range 0.5<Mμμ<12.0 GeV, or in the range 2.4<Mμμ<4.2 GeV;
  • a pair of muons at L1, both confirmed at HLT with cuts of (4,4) or (4,6) GeV applied.The two muons are required to be in the invariant mass range 0.5<Mμμ<12.0 GeV

Additionally the pair of muons are required to have a minimum pT of (2.5, 4) GeV as calculated by the offline reconstruction. At least one high-quality (“combined”) muon is required in each pair. The signal lineshape fits are both Gaussian with a third-order polynomial to model the background. The plot corresponds to an integrated luminosity of around 41 pb-1.

http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/BPHYSICS/PUBLIC/jpsiMass_approved.png
APPROVED eps file
Di-muon invariant mass in the region of the ψ and Υ meson families - both muons in the barrel
Υ(1s,2s,3s)→μμ candidates; plots shows all oppositely charged di-muon pairs with invariant masses between 8 and 12 GeV, where both muons are detected in the barrel. Events firing the following triggers are used, with progressively more selective triggers applied as the instantaneous luminosity rises:
  • a single muon at level 1 (L1) without further selection
  • a single muon at level 1, confirmed at high-level trigger (HLT) with cuts of either 4 or 6 GeV applied;
  • a single muon at L1, confirmed at HLT with cuts of either 4 or 6 GeV applied, and then a second muon found at HLT in the same region of interest (RoI) as the L1 muon. The two muons are required to be in the invariant mass range 0.5<Mμμ<12.0 GeV;
  • a single muon at L1, confirmed at HLT with cuts of either 4 or 6 GeV applied, and then a second muon found at HLT anywhere in the detector. The two muons are required to be in the invariant mass range 0.5<Mμμ<12.0 GeV or in the range 8.0<Mμμ<12.0 GeV;
  • a pair of muons at L1, both confirmed at HLT with cuts of (4,4) or (4,6) GeV applied. The two muons are required to be in the invariant mass range 0.5<Mμμ<12.0 GeV or in the range 8.0<Mμμ<12.0 GeV;

Additionally the pair of muons are required to have a minimum pT of (2.5, 4) GeV calculated by the offline reconstruction. At least one high-quality (“combined”) muon is required in each pair. The signal lineshape fits are Gaussian with a fourth-order Chebyshev polynomial to model the background. The separations of the three peaks are fixed using the PDG masses but the absolute position on the invariant mass scale is allowed to float in the fit. The plots corresponds to an integrated luminosity of around 41 pb-1.

http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/BPHYSICS/PUBLIC/Upsi_mass_3G_CP4_fix_BB.png
APPROVED eps file
Di-muon invariant mass in the region of the ψ and Υ meson families - one muon in an endcap and the other in the barrel
Υ(1s,2s,3s)→μμ candidates; plots shows all oppositely charged di-muon pairs with invariant masses between 8 and 12 GeV, where one muon is detected in the barrel, and the other in an endcap. Events firing the following triggers are used, with progressively more selective triggers applied as the instantaneous luminosity rises:
  • a single muon at level 1 (L1) without further selection
  • a single muon at level 1, confirmed at high-level trigger (HLT) with cuts of either 4 or 6 GeV applied;
  • a single muon at L1, confirmed at HLT with cuts of either 4 or 6 GeV applied, and then a second muon found at HLT in the same region of interest (RoI) as the L1 muon. The two muons are required to be in the invariant mass range 0.5<Mμμ<12.0 GeV;
  • a single muon at L1, confirmed at HLT with cuts of either 4 or 6 GeV applied, and then a second muon found at HLT anywhere in the detector. The two muons are required to be in the invariant mass range 0.5<Mμμ<12.0 GeV or in the range 8.0<Mμμ<12.0 GeV;
  • a pair of muons at L1, both confirmed at HLT with cuts of (4,4) or (4,6) GeV applied. The two muons are required to be in the invariant mass range 0.5<Mμμ<12.0 GeV or in the range 8.0<Mμμ<12.0 GeV;

Additionally the pair of muons are required to have a minimum pT of (2.5, 4) GeV calculated by the offline reconstruction. At least one high-quality (“combined”) muon is required in each pair. The signal lineshape fits are Gaussian with a fourth-order Chebyshev polynomial to model the background. The separations of the three peaks are fixed using the PDG masses but the absolute position on the invariant mass scale is allowed to float in the fit. The plots corresponds to an integrated luminosity of around 41 pb-1.

http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/BPHYSICS/PUBLIC/Upsi_mass_3G_CP4_fix_EB.png
APPROVED eps file
Di-muon invariant mass in the region of the ψ and Υ meson families - both muons in the endcaps
Υ(1s,2s,3s)→μμ candidates; plots shows all oppositely charged di-muon pairs with invariant masses between 8 and 12 GeV, where both muons are detected in the endcaps. Events firing the following triggers are used, with progressively more selective triggers applied as the instantaneous luminosity rises:
  • a single muon at level 1 (L1) without further selection
  • a single muon at level 1, confirmed at high-level trigger (HLT) with cuts of either 4 or 6 GeV applied;
  • a single muon at L1, confirmed at HLT with cuts of either 4 or 6 GeV applied, and then a second muon found at HLT in the same region of interest (RoI) as the L1 muon. The two muons are required to be in the invariant mass range 0.5<Mμμ<12.0 GeV;
  • a single muon at L1, confirmed at HLT with cuts of either 4 or 6 GeV applied, and then a second muon found at HLT anywhere in the detector. The two muons are required to be in the invariant mass range 0.5<Mμμ<12.0 GeV or in the range 8.0<Mμμ<12.0 GeV;
  • a pair of muons at L1, both confirmed at HLT with cuts of (4,4) or (4,6) GeV applied. The two muons are required to be in the invariant mass range 0.5<Mμμ<12.0 GeV or in the range 8.0<Mμμ<12.0 GeV;

Additionally the pair of muons are required to have a minimum pT of (2.5, 4) GeV calculated by the offline reconstruction. At least one high-quality (“combined”) muon is required in each pair. The signal lineshape fits are Gaussian with a fourth-order Chebyshev polynomial to model the background. The separations of the three peaks are fixed using the PDG masses but the absolute position on the invariant mass scale is allowed to float in the fit. The plots corresponds to an integrated luminosity of around 41 pb-1.

http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/BPHYSICS/PUBLIC/Upsi_mass_3G_CP4_fix_EE.png
APPROVED eps file

J/ψ and ψ(2s) candidates
J/ψ→μμ and ψ(2s)→μμ candidates; plot shows all oppositely charged di-muon pairs passing vertexing with invariant masses between 2.6 and 4.0 GeV. Events which fire a variety of di-muon triggers, with one or two muons at level 1 confirmed at the high level trigger (HLT), are included. The pair of muons are required to have a minimum pT of (2.5, 4) GeV as calculated by the offline reconstruction. At least one high-quality (“combined”) muon is required in each pair. The signal lineshape fits are both Gaussian with a third-order polynomial to model the background. The masses and the widths of the two signals are free parameters of the fit. The uncertainty on the yield is statistical only, whereas the uncertainty on the fitted mass corresponds to a ~1 per mille uncertainty on the pT scale calibration. The plot corresponds to an integrated luminosity of around 0.24 fb-1
http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/BPHYSICS/PUBLIC/jpsiMass_data11_B2toE_v1.png
APPROVED eps file
Di-muon invariant mass in the region of the Υ meson families - both muons in the barrel
Υ(1s,2s,3s)→μμ candidates; plots shows all oppositely charged di-muon pairs with invariant masses between 8 and 12 GeV, where both muons are detected in the barrel (|η|<1.05) Events which fire a variety of di-muon triggers, with one or two muons at level 1 confirmed at the high level trigger (HLT), are included. Additionally the pair of muons are required to have a minimum pT of (4, 4) GeV calculated by the offline reconstruction. At least one high-quality (“combined”) muon is required in each pair. The signal lineshape fits are Gaussian with a fourth-order Chebyshev polynomial to model the background. The separations of the three peaks are fixed using the PDG masses but the absolute position on the invariant mass scale is a free parameter of the fit. The widths of the 2S and 3S peaks are fixed to that of the 1S, which is a free parameter of the fit. All uncertainties quoted are statistical The plots correspond to an integrated luminosity of around 0.24 fb-1.
http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/BPHYSICS/PUBLIC/Upsi_mass_BB_without2S3S.png
APPROVED eps file

CSC B-physics chapter

  • The "CSC book" was produced in 2008 as a final Monte Carlo physics and performance exercise before data taking. All figures and tables are available under here. The full reference is:
    ATLAS Collaboration,
    Expected Performance of the ATLAS Experiment, Detector, Trigger and Physics,
    CERN-OPEN-2008-020, ISBN978-92-9083-321-5, Geneva, 2008

Daily updated table...

Full Title Journal Links Status Groups
 PUBLISHED  Angular analysis of $B^0_d \rightarrow K^{*}\mu^+\mu^-$ decays in $pp$ collisions at $\sqrt{s}= 8$ TeV with the ATLAS detector JHEP Inspire, arXiv, Figures JHEP 10 (2018) 047
(Submitted: 2018/05/10)
BPHY
 PUBLISHED  Search for a Structure in the $B^0_s \pi^\pm$ Invariant Mass Spectrum with the ATLAS Experiment PRL Inspire, arXiv, Figures Phys. Rev. Lett. 120 (2018) 202007
(Submitted: 2018/02/06)
BPHY
 PUBLISHED  Measurement of quarkonium production in proton--lead and proton--proton collisions at $5.02$ $\mathrm{TeV}$ with the ATLAS detector EPJC Inspire, arXiv, Figures Eur. Phys. J. C 78 (2018) 171
(Submitted: 2017/09/10)
HION / BPHY
 PUBLISHED  Measurement of $b$-hadron pair production with the ATLAS detector in proton-proton collisions at $\sqrt{s}=8$ TeV JHEP Inspire, arXiv, Figures JHEP 11 (2017) 62
(Submitted: 2017/05/09)
BPHY
 PUBLISHED  Measurement of the prompt $J/\psi$ pair production cross-section in $pp$ collisions at $\sqrt{s} = 8$ TeV with the ATLAS detector EPJC Inspire, arXiv, Figures Eur. Phys. J. C77 (2017) 76
(Submitted: 2016/12/09)
BPHY
 PUBLISHED  Measurements of $\psi(2S)$ and $X(3872) \to J/\psi\pi^{+}\pi^{-}$ production in pp collisions $\sqrt{s} = 8$ with the ATLAS detector JHEP Inspire, arXiv, Figures JHEP 01 (2017) 117
(Submitted: 2016/10/28)
BPHY
 PUBLISHED  Measurement of the relative width difference of the $B0$--$\bar B0$ system with the ATLAS detector JHEP Inspire, arXiv, Figures JHEP06 (2016) 081
(Submitted: 2016/05/24)
BPHY
 PUBLISHED  Study of the rare decays of $B^0_s$ and $B^0$ into muon pairs from data collected during the LHC Run 1 with the ATLAS detector EPJC Inspire, arXiv, Figures Eur. Phys. J. C 76 (2016) 513
(Submitted: 2016/04/14)
BPHY
 PUBLISHED  Measurement of the CP-violating phase $\phi_s$ and the $B^0_s$ meson decay width difference with $B^0_s \to J/\psi\phi$ decays in ATLAS JHEP Inspire, arXiv, Figures JHEP 08 (2016) 147
(Submitted: 2016/01/13)
BPHY
 PUBLISHED  Measurement of the differential cross-sections of prompt and non-prompt production of $J/\psi$ and $\psi(2\mathrm{S})$ in $pp$ collisi ons at $\sqrt{s} = 7$ and $8$ TeV with the ATLAS detector EPJC Inspire, arXiv, Figures Eur. Phys. J. C 76(5), 1-47, (2016)
(Submitted: 2015/12/11)
BPHY
 PUBLISHED  Measurement of $D^{*\pm}$, $D^\pm$ and $D_s^\pm$ meson production cross sections in $pp$ collisions at $\sqrt{s}=7$ TeV with the ATLAS detector NPB Inspire, arXiv, Figures Nucl. Phys. B 907 (2016) 717
(Submitted: 2015/12/09)
BPHY
 PUBLISHED  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 PRL Inspire, arXiv, Figures Phys. Rev. Lett. 115, 262001 (2015)
(Submitted: 2015/07/31)
BPHY
 PUBLISHED  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 PLB Inspire, arXiv, Figures Physics Letters B 751 (2015) 63-80
(Submitted: 2015/07/29)
BPHY
 PUBLISHED  Study of the $B_c^+ \to J/\psi D_s^+$ and $B_c^+ \to J/\psi D_s^{*+}$ decays with the ATLAS detector EPJC Inspire, arXiv, Figures Eur. Phys. J. C, 76(1), 1-24 (2016)
(Submitted: 2015/07/25)
BPHY
 PUBLISHED  Observation and measurements of the production of prompt and non-prompt J/ψ mesons in association with a Z boson in proton-proton collisions at √s = 8 TeV with the ATLAS detector EPJC Inspire, arXiv, Figures Eur. Phys. J. C75 (2015) 229
(Submitted: 2014/12/19)
BPHY
 PUBLISHED  Search for the $X_b$ and other hidden-beauty states in the $\pi^+ \pi^- \Upsilon$(1S) channel at ATLAS PLB Inspire, arXiv, Figures Physics Letters B 740 (2015), pp. 199-217
(Submitted: 2014/10/16)
BPHY
 PUBLISHED  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 JHEP Inspire, arXiv, Figures JHEP09(2014)079
(Submitted: 2014/07/21)
BPHY
 PUBLISHED  Flavour tagged time dependent angular analysis of the Bs→J/ψ phi decay and extraction of Delta Gammas and the weak phase phis in ATLAS PRD Inspire, arXiv, Figures Phys. Rev. D. 90, 052007 (2014)
(Submitted: 2014/07/05)
BPHY
 PUBLISHED  Observation of an excited $B_{c}$ meson state PRL Inspire, arXiv, Figures Phys. Rev. Lett. 113, 212004 (2014)
(Submitted: 2014/07/03)
BPHY
 PUBLISHED  Measurement of $\chi_{c1}$ and $\chi_{c2}$ production with $\sqrt{s} = 7$~TeV $pp$ collisions at ATLAS JHEP Inspire, arXiv, Figures JHEP07(2014)154
(Submitted: 2014/04/28)
BPHY
 PUBLISHED  Measurement of the parity violating asymmetry parameter &α;b and the helicity amplitudes for the decay &Λ;B → J/ψ &Λ;0 with the ATLAS detector PRD Inspire, arXiv, Figures PhysRevD.89.092009
(Submitted: 2014/04/04)
BPHY
 PUBLISHED  Measurement of the production cross-section of prompt J/Psi mesons in association with a W boson in pp collisions at √s = 7 TeV with the ATLAS detector JHEP Inspire, arXiv, Figures JHEP04(2014)172
(Submitted: 2014/01/14)
BPHY
 PUBLISHED  Measurement of the differential cross section of B+ meson production in pp collisions at √s = 7 TeV at ATLAS JHEP Inspire, arXiv, Figures JHEP10(2013)042
(Submitted: 2013/06/29)
BPHY
 PUBLISHED  Measurement of &Υ; production in 7 TeV pp collisions at ATLAS PRD Inspire, arXiv, Figures Phys. Rev. D 87, 052004 (2013)
(Submitted: 2012/11/30)
BPHY
 PUBLISHED  Time dependent angular analysis of the decay Bs→J/ψ phi and extraction of Delta Gammas and the CP-violating weak phase phis by ATLAS JHEP Inspire, arXiv, Figures JHEP 1212 (2012) 072
(Submitted: 2012/08/02)
BPHY
 PUBLISHED  Measurement of the &Λ;b lifetime and mass in the ATLAS experiment PRD Inspire, arXiv, Figures Phys. Rev. D 87, 032002 (2013)
(Submitted: 2012/07/10)
BPHY
 PUBLISHED  Measurement of the b-hadron production cross section using decays to D*muX final states in pp collisions at √s = 7 TeV with the ATLAS detector NPB Inspire, arXiv, Figures Nucl. Phys. B 864 (2012) 341-381
(Submitted: 2012/06/14)
BPHY
 PUBLISHED  Search for the decay B0s→mu+mu- with the ATLAS detector PLB Inspire, arXiv, Figures Phys. Lett. B 713 (2012) 387-407
(Submitted: 2012/04/03)
BPHY
 PUBLISHED  Observation of a new chib state in radiative transitions to &Υ;(1S) and &Υ;(2S) at ATLAS PRL Inspire, arXiv, Figures Phys. Rev. Lett. 108 (2012) 152001
(Submitted: 2011/12/21)
BPHY
 PUBLISHED  $\&Υ;(1S)$ differential production cross section PLB Inspire, arXiv, Figures Phys.Lett. B 705 (2011) 9
(Submitted: 2011/06/27)
BPHY
 PUBLISHED  Measurement of the differential cross-sections of inclusive, prompt and non-prompt J/ψ production in proton-proton collisions at √s = 7 TeV NPB Inspire, arXiv, Figures Nucl. Phys. B 850 (2011) 387-444
(Submitted: 2011/04/15)
BPHY
Last updated: 2018-11-21, 17:14

Full Title Ref Code Publication Date Groups
Study of the rare decays of B0s and B0 into muon pairs from data collected during 2015 and 2016 with the ATLAS detector ATLAS-CONF-2018-046 2018/09/18 BPHY
Angular analysis of $B0_d → K^{*}\mu^+\mu^-$ decays in $pp$ collisions at $√s= 8$ TeV with the ATLAS detector ATLAS-CONF-2017-023 2017/03/21 BPHY
Measurement of the prompt J/ψ pair production cross-section in pp collisions at √s = 8 TeV with the ATLAS detector ATLAS-CONF-2016-047 2016/08/02 BPHY
Production measurements of ψ(2S) and X(3872) →J/ψ(→μ+μ-+π- at √s = 8 TeV with the ATLAS detector ATLAS-CONF-2016-028 2016/06/06 BPHY
$B^\pm$ mass reconstruction in $B^\pm → J/\ψ K^\pm$ decay at ATLAS at 13 TeV $pp$ collisions at the LHC ATLAS-CONF-2015-064 2015/12/14 BPHY
Measurement of Υ(nS) production with p+Pb collisions at 5.02 TeV and pp collisions at 2.76 TeV ATLAS-CONF-2015-050 2015/09/26 HION / BPHY
Measurement of the differential non-prompt J/ψ production fraction √s = 13 TeV pp collisions at the ATLAS experiment ATLAS-CONF-2015-030 2015/07/21 BPHY
Measurement of the differential cross-sections of prompt and non-prompt production of J/ψ and ψ(2S) in pp collisions at √s = 7 TeV and 8 TeV with the ATLAS detector ATLAS-CONF-2015-024 2015/06/06 BPHY
Study of the Bc+→J/ψDs+ and Bc+→J/ψDs*+ decays with the ATLAS detector ATLAS-CONF-2015-014 2015/03/23 BPHY
Measurement of the χc1 and χc2 production with √s = 7 TeV proton-proton collisions at ATLAS ATLAS-CONF-2013-095 2013/08/30 BPHY
Cross-section measurement of ψ(2S) → J/ψ(→ μ+μ-+π- in √s = 7 TeV proton-proton collisions at ATLAS ATLAS-CONF-2013-094 2013/08/30 BPHY
Limit on Bos → μμ branching fraction based on 4.9 fb-1 of integrated luminosity ATLAS-CONF-2013-076 2013/07/16 BPHY
Measurement of the parity violating asymmetry parameter &α;b and the helicity amplitudes for the decay &Λ;b0→ J/ψ &Λ;0 in the ATLAS experiment ATLAS-CONF-2013-071 2013/07/16 BPHY
Measurement of the production cross section of prompt J/ψ mesons in association with a W± boson in pp collisions at √s = 7 TeV ATLAS-CONF-2013-042 2013/04/20 BPHY
Flavour tagged time dependent angular analysis of the B0s → J/ψ ϕ decay and extraction of ΔΓs and the weak phase φs in ATLAS. ATLAS-CONF-2013-039 2013/04/09 BPHY
Angular analysis of B0d→K*0μ+μ- with the ATLAS Experiment ATLAS-CONF-2013-038 2013/04/05 BPHY
Measurement of the differential cross section of B+ meson production in pp collisions at √s = 7 TeV at ATLAS ATLAS-CONF-2013-008 2013/03/02 BPHY
Search for the rare decays B0(s) → μ+μ- at the LHC with the ATLAS, CMS and LHCb experiments ATLAS-CONF-2012-061 2012/06/18 BPHY
Measurement of the &Λ;0b lifetime and mass in the ATLAS experiment ATLAS-CONF-2012-055 2012/06/04 BPHY
Observation of the B±c meson in the decay B±c → J/ψ(μ+μ-± with the ATLAS detector at the LHC ATLAS-CONF-2012-028 2012/03/07 BPHY
Search for the decay B0s → μ+μ- with the ATLAS detector ATLAS-CONF-2012-010 2012/03/02 BPHY
Measurement of the average B lifetime in inclusive B → J/ψ X → μ+μ− X decays with the ATLAS detector ATLAS-CONF-2011-145 2011/10/11 BPHY
Observation of the χc1(1P) and χc2(1P) charmonium states in √s = 7 TeV pp collisions at the ATLAS experiment ATLAS-CONF-2011-136 2011/08/25 BPHY
Observation of the decay &Λ;b → J/ψ (μμ)&Λ; with the ATLAS experiment at the LHC ATLAS-CONF-2011-124 2011/08/26 BPHY
Observation of the decay $B0_d→ J/\psi(\mu^+\mu^-)K_S0(\pi^+\pi^-)$ with the ATLAS experiment at the LHC ATLAS-CONF-2011-105 2011/07/20 BPHY
Measurement of the B0d and B0s lifetimes in the decay modes B0d→J/ψK0* and B0s→J/ψφ in ATLAS ATLAS-CONF-2011-092 2011/07/05 BPHY
Observation of the B0d and B0s mesons in the decays B0d→J/ψK0* and B0s→J/ψφ in ATLAS ATLAS-CONF-2011-050 2011/04/01 BPHY
Measurement of D^(*) meson production cross sections in pp collisions at √s = 7 TeV with the ATLAS detector ATLAS-CONF-2011-017 2011/03/12 BPHY
Observation of the B± meson in the decay B±→J/ψ(μ+μ-)K± in ATLAS ATLAS-CONF-2010-098 2010/11/16 BPHY
J/ψ Performance of the ATLAS Inner Detector ATLAS-CONF-2010-078 2010/07/21 IDTR / BPHY
A first measurement of the differential cross section for the J/ψ→μμ resonance and the non-prompt to prompt J/ψ cross section ratio with pp collisions at √s = 7 TeV in ATLAS ATLAS-CONF-2010-062 2010/07/21 BPHY
First observation of the J/ψ→μ+μ- resonance in ATLAS pp collisions at √s = 7 TeV ATLAS-CONF-2010-045 2010/06/07 BPHY
D^(*) mesons reconstruction in pp collisions at √s = 7 TeV ATLAS-CONF-2010-034 2010/06/05 IDTR / BPHY
Number of ConfNotes: 33

Last updated: 2018-11-21, 17:14


Major updates:
-- Main.DarrenPrice - 2016-07-08 -- Pavel.Reznicek - 04-Aug-2015

Responsible: Main.PavelReznicek
Subject: public

Last reviewed by: PavelReznicek - 04-Aug-2015

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