vasily dzhordzhadze star analysis meeting bnl october 16 2007
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Search for P and CP Violation in Heavy Ion Interactions with the STAR TPC Detector

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Vasily Dzhordzhadze STAR Analysis Meeting, BNL October 16, 2007. Search for P and CP Violation in Heavy Ion Interactions with the STAR TPC Detector. Motivation. Search for the CP violation in Heavy Ion Collisions predicted by D. Kharzeev [1] :

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vasily dzhordzhadze star analysis meeting bnl october 16 2007
Vasily Dzhordzhadze

STAR Analysis Meeting, BNL

October 16, 2007

Search for P and CP Violation in Heavy Ion Interactions with the STAR TPC Detector
motivation
Motivation
  • Search for the CP violation in Heavy Ion Collisions predicted by D. Kharzeev [1] :

We are looking for a charge asymmetry relative to the Reaction Plane in HIC

  • We are using specific angular correlations, the method developed by S. Voloshin [2] .

[1] D. Kharzeev, hep-ph/0406125 (2004)

[2] S. Voloshin, PRC 70 057901 (2004)

analysis
Analysis
  • Analysis performed by Ilya Selyuzhenkov observed very significant effect of possible CP violation -> very exciting Physics
  • Independent Analysis performed by Vasily Dzhordzhadze is reported in this presentation
  • Both analysis get consistent results
  • We found CP violation effects which needs further studies to determine the nature of the observed signals
statistics used in the analysis
Statistics used in the Analysis

Run 4 :

62 GeV: 13.4 M -> 8.3 M

200 GeV: 18.3 M -> 7.1 M (Reverse Field)

200 GeV: 5.4 M -> 4.4 M (Full Field)

Trigger cuts and Zvertex cuts, excluding

Zvertex=0

star meeting 8 29 07
STAR Meeting 8/29/07

J. Dunlope, T. Hallman, M. Potekhin, Y. Semertzidis

Recommendations to check:

1. Agreement between two searches(done)

2. Dependence on beam intensity (done)

3. Dependence on Vertex position (done)

4. Dependence on TPC Space charge

5. Dependence on TPC Pad efficiencies

6. Simulation study

tpc study not yet done
TPC Study (not yet done)
  • TPC Space Charge (In Run4 only simplified version of the Space Charge analysis is possible)
  • TPC Pad Efficiency

21

mc simulation
MC Simulation
  • MC simulation : Hijing+Geant+Reconstruction

21

mc simulation1
MC Simulation
  • MC simulation: Hijing 100K

21

mc simulation2
MC Simulation
  • MC simulation : Hijing 100K

21

mc simulation3
MC Simulation
  • Available MC events (39K) analysis shows a necessity of error reduction by factor of ~10, which means simulation of ~1-5 M events for data sample of AuAu 200 GeV. Other data also needs an independent simulation
  • Hijing simulation with and without flow is necessary to separate detector effects with the flow
star data mc available
STAR Data & MC available
  • Exp AuAu 200 GeV - Run 4 23.4 M -> 12.0 M
  • Exp AuAu 62 GeV - Run4 13.7 M -> 8.3 M
  • Exp CuCu 200 GeV - Run5
  • Exp CuCu 62 GeV - Run5
  • Exp AuAu 200 GeV – Run7
  • MC AuAu 200 GeV Run4 38.8K-> 21.2K
  • MC AuAu 62 GeV Run 4 100K
  • MC CuCu 200 GeV Run 5 54K
  • MC CuCu 62 GeV Run 5 189K
  • MC AuAu 200 GeV Run 7 100K
summary
Summary
  • CP Violating signals are seen in 3 data samples of the Run 4: 62 GeV, 200 GeV (RF) and (FF)
  • Two independent analysis shows consistent results in the limits of statistical errors
  • In the limits of the stat. errors obtained results are in good agreement for high and low beam intensities
  • With same limits result doesn’t depend on a AuAu interaction vertex position
  • Analysis of Hijing simulated data was done; More simulated efforts are foreseen
  • Study of the TPC Space Charge and Pad efficiencies influence on the signals are planned
summary continued
Summary (continued)
  • Analysis of Run 5 (CuCu, 200 and 62 GeV) and Run 7 (AuAu 200 and 62 GeV) in planned. In this runs detailed study of the TPC space charge is possible
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