Non-Gibbs Particle Spectra from Thermal Equilibrium

Autor:	Biro, T. S., Gyorgyi, G., Jakovac, A., Purcsel, G.
Rok vydání:	2004
Předmět:	High Energy Physics - Phenomenology High Energy Physics - Phenomenology (hep-ph) FOS: Physical sciences Nuclear Experiment
DOI:	10.48550/arxiv.hep-ph/0409157
Popis:	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. Comment: 20 pages in preprint format incl. 3 figures
Databáze:	OpenAIRE
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