1. Heavy Quark Correlations and J/ψ Production in Heavy Ion Collisions REU Presentation Presenter: Ray Niazi Mentor: Dr. Ko

2. Quark Gluon Plasma (QGP)
All matter was in the QGP for the first 10-6 seconds of the universe’s origin
Created at high
temperatures and energy densities

3. Heavy Ion Collisions Super Proton Synchrotron (SPS) (√sNN=17.3 GeV)
Relativistic Heavy Ion Collider (RHIC)
(√sNN=200 GeV)
Large Hadron Collider (LHC)
(√sNN=2.76 TeV)
Used to recreate the Quark Gluon Plasma

4. J/ψ as a Probe of the QGP
J/ψ is a bound state of charm and anticharm quarks

5. Parton Cascade Model (PCM)
Used to simulate QGP dynamics
Classical trajectories in phase space
Relativistic Kinematics

6. Sigma represents the cross section σ = 4 mb
Criteria for collision is a critical distance between partons at the time of closest approach
Sigma represents the cross section
σ = 4 mb
Processes considered in the simulation d

7. Parton Initialization
Uncorrelated
Correlated c c g g g g c c

8. Varying Collider Parameters
Npartons
Npairs
T (MeV)
Volume (fm3)
dz (fm)
SPS
1071 1
290
84.79
0.5
RHIC
2409 3
380
81.77
LHC
4958 20
480

9. Testing the Validity of the Code

10. Simulation Results
Graph of the time evolution of the number of J/Ψ produced in the correlated and uncorrelated cases for SPS energy. It is apparent that the correlated case is mostly larger.

11. Graph of the ratio of the number of J/Ψ produced in the correlated and uncorrelated cases for the parameters of the different beams.

12. Charm Pairs Dependence
As the amount of pairs increase, the disparity between the correlated and uncorrelated cases decreases.

13. Number of Partons Dependence
As the number of partons increases, the disparity between the correlated and uncorrelated cases increases.

14. Screening Effects Results
These are the ratios when the dissociation temperature is the average of the free energy and internal energy limits

15. Conclusions and Future Studies
Correlation increases the overall yield of J/ψ
Increasing the number of gluons enhances this effect
Increasing the number of charm pairs decreases this effect
Have more realistic initial parton distributions

16. Acknowledgments National Science Foundation (NSF)
Department of Energy (DoE)
Cyclotron Institute (Dr. Sherry Yennello and Lauren Heilborn)
Dr. Che-Ming Ko
Dr. Yunpeng Liu