Parton distributions at hadronization from bulk dense matter produced at RHIC. Jin-Hui Chen Shanghai Institute of Applied Physics, CAS In collaboration with F. Jin, D. Gangadharan, X. Cai, H. Huang and Y. Ma. Introduction and Motivation
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Parton distributions at hadronization from bulk dense matter produced at RHIC
Shanghai Institute of Applied Physics, CAS
In collaboration with F. Jin, D. Gangadharan, X. Cai, H. Huang and Y. Ma
Introduction and Motivation
Phenomena @ RHIC in favor of quark Coalescence/Recombination mechanism
Results and Discussions
Constituent quark pT distribution at hadronization
s/d quark ratio at hadronization
Parton freeze-out properties
Dynamical model calculation
Summary and Outlook
STAR RunII Au+Au @ 200 GeV
0 1 2 3 4 5 6 7 8 9 10 11 12 GeV/c
STAR RunIV Au+Au @ 200 GeV
Extract the s quarks pT distributions from high stat. W f data?
If baryons of pT are mostly formed from coalescence of partons at pT/3 and mesons of pT are mostly formed from coalescence of partons at pT/2 [1,2,3]
 R.C. Hwa et al., Phys. Rev. C 66, 025205 (2002);
 V. Greco et al., Phys. Rev. Lett. 90, 202302 (2003);
 R.J. Fries et al., Phys. Rev. Lett. 90, 202303 (2003).
 B.I. Abelev et al., Phys. Rev. Lett. 97, 132301 (2006);
 S. Wheaton and J. Cleymans, J. Phys. G 31, S1069 (2005);
 M. Bleicher et al., J. Phys. G 25, 1859 (1999); H.J. Drescher et al., Phys. Rep. 350, 93 (2001).
 R. Witt, J. Phys. G 34, S921 (2007);
s/d ratio compared with Reco. model calculation
Good agreement with the data; Large exp. uncertainty;
Thermal parton distribution function:
R.J. Fries et al.,Phys. Rev. C 68,044902 (2003);
Phys. Rev. Lett. 90,202303 (2003).
i.e. the hadronic evolution process have been added to the hydrodynamic models as an afterburner and have been shown to significantly alter the spectra shapes of ordinary hadrons. T. Hirano et al., Phys. Rev. C 77, 044909 (2008)
Can our derived quark distributions, representing a cumulative effect from initial conditions through partonic evolution, be used to determine the final-state hadron momentum distribution?
 Z.W. Lin et al., Phys. Rev. C 72, 064901 (2005)
It can faithfully reproduce the data at intermediate pT.
An essential ingredient in Reco./Coa. model calculation: the distribution of effective constituent quarks that readily turn into hadron.
Our approach in complement with the constituent quark number scaling in elliptic flow provides a means to measure quantitative parton distributions at hadronization.
c.f. Phys. Rev. C 78 (2008) 034907
Quantify the parton distributions at hadronization
Strange quark momentum difference in AMPT model