Particle Multiplicities and Thermalization in High Energy Collisions

Details Particle Multiplicities and Thermalization in High Energy Collisions Particle Multiplicities and Thermalization in High Energy Collisions

2000-01-25

arxiv.org/abs/nucl-th/0001044v2

Int.J.Mod.Phys. E12 (2003) 649-659

Physics

Nuclear Physics

Nuclear Theory

12 pages, 2 figures; Revised version to appear in IJMPE. References added, including to previous work by C.N. Yang et al

Scientific paper

10.1142/S0218301303001478

We investigate the conditions under which particle multiplicities in high energy collisions are Boltzmann distributed, as is the case for hadron production in e^+e^-, pp, p-pbar and heavy ion collisions. We show that the apparent temperature governing this distribution does not necessarily imply equilibrium (thermal or chemical) in the usual sense, as we explain. We discuss an explicit example using tree level amplitudes for N photon production in which a Boltzmann-like distribution is obtained without any equilibration. We argue that the failure of statistical techniques based on free particle ensembles may provide a signal for collective phenomena (such as large shifts in masses and widths of resonances) related to the QCD phase transition.

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