Low-momentum pion enhancement from schematic hadronization of a gluon-saturated initial state

Abstract

We study the particle production in the early stage of the ultrarelativistic heavy-ion collisions. To this end the Boltzmann kinetic equations for gluons and pions with elastic rescattering are considered together with a simple model for the parton-hadron conversion process (hadronisation). It is shown that the overpopulation of the gluon phase space in the initial state leads to an intermediate stage of Bose enhancement in the low-momentum gluon sector which due to the gluon-pion conversion process is then reflected in the final distribution function of pions. This pattern is very similar to the experimental finding of a low-momentum pion enhancement in the ALICE experiment at CERN LHC. Relations to the thermal statistical model of hadron production and the phenomenon of thermal and chemical freeze-out are discussed in this context.

References in corpus (4)

• Bose-Einstein condensation of pions in heavy-ion collisions at the CERN Large Hadron Collider (LHC) energies
• Thermalization of gluons with Bose-Einstein condensation
• Transverse-momentum spectra of strange particles produced in Pb+Pb collisions at $\sqrt{s_{\mathrm{NN}}}=2.76$ TeV in the chemical non-equilibrium model
• Dynamical scheme for hadronization with first-order phase transition

Cited by in corpus (1)

• Nonequilibrium pion distribution within the Zubarev approach