HeavyIonQuarkonia

Introduction

At this page you will find data on quarkonia in Heavy Ion environment

U

• U mass resolution in central Pb+Pb collisions as a function of eta (blue circles). For comparison, mass resolution for single U is shown by magenta squares. Error bars show statistical errors only.

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• U mass resolution in central Pb+Pb collisions as a function of pT. Error bars show statistical errors only.

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• U acceptance times efficiency as a function of |eta| (left) and pT (right) for central (b=2 fm) Pb+Pb collisions. Error bars show statistical errors only.

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• Di-muon invariant mass distribution as expected for one month of data, taking into account acceptance and efficiency, for decay muons in the barrel region only (|eta| < 1). Error bars show statistical errors only. Solid color histograms represent expected yields from the three U states, and black crosses show the sum of signal and background. (Right plot is used for PPR):

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• The upsilon mass resolution (top) and the integrated upsilon selection efficiency after cuts (bottom), as a function of pseudo-rapidity acceptance of the decay muons for different strategies.

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• PT and pseudo-rapidity distributions of muons produced by upsilons (top) and J/psi (bottom). The black full lines correspond to ordinary combined muons, whereas the red dashed lines correspond to additional muons obtained by tagging.

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• dN/dpT (left) and dN/dy (right) distributions for U ! μ+μ− (color online). The generated distributions are in full black, the reconstructed distributions are in dotted blue for the standard selection with a muon-pT >3 GeV, and in dashed red for the tagged muon selection with a muon-pT >3 GeV.

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• dN/dpT (left) and dN/dy (right) distributions for J/y ! μ+μ− (color online). The generated distributions are in full black, the reconstructed distributions (x 5) are in dashed-dotted black for the standard selection with a muon-pT >3 GeV, in dotted blue for the standard selection with a muon-pT >1.5 GeV and in dashed red for the tagged muon selection with a muon pT >1.5 GeV.

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• (left) Di-muon invariant mass distribution for Z bosons embedded in p+p collisions. (right) Di-muon invariant mass distribution for Z bosons embedded in central Pb+Pb collisions.
  

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• (left) Z acceptance times reconstruction efficiency (Ae) for p+p collisions as a function of h and transverse momentum. The largest-size boxes correspond to efficiency of about 75%. (right) Ae for p+p collisions (black histogram) and for central Pb+Pb collisions (blue markers) as a function of pseudorapidity. (right) Di-muon invariant mass distribution for Z bosons embedded in central Pb+Pb collisions.

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• Ratio of the Z reconstruction efficiency in central Pb+Pb collisions to that found in p+p collisions as a function of pseudorapidity.

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• Pseudorapidity (black curve) and rapidity (magenta histogram) distributions of Z predicted by PYTHIA for p+p collisions at 5.5 TeV.

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Major updates:
-- AdamTrzupek - 08 Jul 2009

Responsible: AdamTrzupek
Last reviewed by: Never reviewed