Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2008-04-10
Physics
Nuclear Physics
Nuclear Theory
5 pages, 4 figures. Paper submitted to Phys. Rev. Lett
Scientific paper
The partition function of nonequilibrium distribution which we recently obtained [arXiv:0802.0259] in the framework of the maximum isotropization model (MIM) is exploited to extract physical information from experimental data on the proton rapidity and transverse mass distributions. We propose to partition all interacting nucleons into ensembles in accordance with the number of collisions. We analyze experimental rapidity distribution and get the number of particles in every collision ensemble. We argue that even a large number of effective nucleon collisions cannot lead to thermalization of nucleon system; the thermal source which describes the proton distribution in central rapidity region arises as a result of fast thermalization of the parton degrees of freedom. The obtained number of nucleons which corresponds to the thermal contribution is treated as a ``nucleon power'' of the created quark-gluon plasma in a particular experiment.
Anchishkin Dmitry
Yezhov Stanislav
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