Parton distributions at hadronization from bulk dense matter produced in Au+Au collisions at {radical}(s{sub NN})=200 GeV
- Nuclear Science division, Shanghai Institute of Applied Physics, CAS, Shanghai, 201800 (China)
- Department of Physics and Astronomy, University of California at Los Angeles, Los Angeles, California, 90095 (United States)
We present an analysis of {omega},{xi},{lambda}, and {phi} spectra from Au+Au collisions at {radical}(s{sub NN})=200 GeV in terms of distributions of effective constituent quarks at hadronization. Consistency in quark ratios derived from various hadron spectra provides clear evidence for hadron formation dynamics as suggested by quark coalescence or recombination models. We argue that the constituent quark distribution reflects properties of the effective partonic degree of freedom at hadronization. Experimental data indicate that strange quarks have a transverse-momentum distribution flatter than that of up/down quarks consistent with hydrodynamic expansion in partonic phase prior to hadronization. Our extracted parton transverse-momentum distributions at the hadronization provide a unique constraint on the partonic evolution history. After the multiphase transport model is tuned to reproduce the strange and up/down quark distributions, the model can describe the measured spectra of hyperons and {phi} mesons very well where hadrons are formed through dynamical coalescence.
- OSTI ID:
- 21192222
- Journal Information:
- Physical Review. C, Nuclear Physics, Vol. 78, Issue 3; Other Information: DOI: 10.1103/PhysRevC.78.034907; (c) 2008 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2813
- Country of Publication:
- United States
- Language:
- English
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