Non-Gibbs Particle Spectra from Thermal Equilibrium

Details Non-Gibbs Particle Spectra from Thermal Equilibrium Non-Gibbs Particle Spectra from Thermal Equilibrium

2004-09-14

arxiv.org/abs/hep-ph/0409157v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

20 pages in preprint format incl. 3 figures

Scientific paper

We propose that transverse momentum spectra with power-law tails observed in ultrarelativistic heavy ion collisions can be interpreted as originating in a medium in thermal equilibrium. General conditions on the dynamical equations are formulated, leading in equilibrium to various energy distributions of particles. Starting with the linear Fokker-Planck equation we analyze conditions for Boltzmann-Gibbs, Tsallis, or other equilibrium distributions based upon the dependence of fluctuation and dissipation on the energy of the observed subsystem. RHIC neutral pion data definitely exclude Boltzmann-Gibbs distribution over the entire range of observed transverse momenta.

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