1. Fu Jinghua Institute of Particle Physics, Huazhong Normal University
Statistical Model Analysis of K/ and p/ fluctuations in heavy-ion collisions
Fu Jinghua
Institute of Particle Physics, Huazhong Normal University

2. Motivation a phase transition event-by-event fluctuations
statistical (thermal) model
ratios of hadron yields
hadronic statistical model
particle yield fluctuations.

3. Energy dependence

4. Centrality dependence
STAR

5. Particle ratio fluctuations
ratios of particles volume fluctuations cancel

6. Particle ratio fluctuations

7. Statistical model
Upper sign for frmions, lower sign for bosons

8. Model parameters
Thermal model codes THERMUS

9. Volume
From Ref. Nucl.Phys.A 772 (2006) 167, in unit of fm3

10. Correction NA49 3D acceptance table HIJING simulations
The percentage of particles inside the NA49
acceptance table

11. Correction
STAR

12. Energy dependence
Data :
Full symbols:
Model :
Open symbols:

13. Centrality dependence
The volume parameter is decided by asking
the average number of K- in the model the
same as the STAR measured K- integrated
rapidity density

14. Data :
Full symbols:
Model :
Open symbols:

15. Conclusion
Detector acceptance increase of fluctuations at the lower NA49 energies
Kinematic cuts & tracking efficiency good description of most central STAR K/
dN/d scaled K/ fluctuations independent of centrality
Opposite sign: resonance decay contributions reduced
Same sign: other sources of correlations

16. Energy dependence