Phase-Space Description of Momentum Spectra in Relativistic Heavy-Ion Collisions

Details Phase-Space Description of Momentum Spectra in Relativistic Heavy-Ion Collisions Phase-Space Description of Momentum Spectra in Relativistic Heavy-Ion Collisions

2005-07-29

arxiv.org/abs/nucl-th/0507076v3

Nucl.Phys.A765:226-251,2006

Physics

Nuclear Physics

Nuclear Theory

23 pages, 15 figures, revtex4, v3: minor revisions

Scientific paper

10.1016/j.nuclphysa.2005.10.013

We consider a phase-space model for particle production in nuclear collisions. Once the multiplicities of the individual particle species are known, single-inclusive momentum spectra can be computed after making simplifying assumptions for the matrix element for multiparticle production. Comparison of the calculated spectra with data for pions and kaons from central Pb+Pb collisions at E_{Lab}=158 AGeV reveals a residual longitudinal phase-space dominance in the final state of the reaction. We account for this by modifying the isotropic, relativistic invariant phase space in a way which retains boost invariance in beam direction but suppresses large transverse momenta. Adjusting a single parameter, we obtain a reasonably good description of transverse momentum and rapidity spectra for both pions and kaons.

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