HeavyIonPublicResults

Publications

Publications appearing in peer-reviewed journals are listed below.

CONF notes

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

Short Title Int L Reference number Location in ATLAS public pages Record in CDS (if applicable)
D^(*) mesons reconstruction in pp collisions at sqrt{s} = 7 TeV 0.37nb-1 ATLAS-CONF-2010-034 ATLAS-CONF-2010-034  

PUB notes

Notes containing preliminary results based on Monte Carlo only (such as feasibility studies), the contents of which may be used in conference talks, are listed below.

Stand-alone plots

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

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.

https://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.

https://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.

https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/BPHYSICS/PUBLIC/Upsi_mass_3G_CP4_fix_EB.png
APPROVED eps file


Major updates:
-- Main.PeterSteinberg - 16-Nov-2010

Responsible: Main.PeterSteinberg
Last reviewed by: Never reviewed

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