Nonequilibrium meson production in strong fields

3rd International Symposium "Optics and its Applications"

Juchnowski, L.^1 ; Blaschke, D.^1,2,3 ; Fischer, T.^1 ; Smolyansky, S.A.^4

Institute of Theoretical Physics, University of Wroclaw, Wroclaw

50-204, Poland^1

Bogoliubov Laboratory for Theoretical Physics, JINR Dubna, Dubna

141980, Russia^2

National Research Nuclear University (MEPhI), Moscow

115409, Russia^3

Department of Physics, Saratov State University, Saratov

410026, Russia^4

关键词: Chiral symmetry;    Heavy ion collision;    Kinetic equations;    Meson production;    Non equilibrium;    Non-equilibrium process;    Strong field;    Time dependent;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/673/1/012009/pdf
DOI  :  10.1088/1742-6596/673/1/012009

来源: IOP

【 摘 要 】

We develop a kinetic equation approach to nonequilibrium pion and sigma meson production in a time-dependent, chiral symmetry breaking field (inertial mechanism). We investigate the question to what extent the low-momentum pion enhancement observed in heavy- ion collisions at CERN - LHC can be addressed within this formalism. In a first step, we consider the inertial mechanism for nonequilibrium production of a - mesons and their simultaneous decay into pion pairs for two cases of a mass evolution. The resulting pion distribution shows a strong low-momentum enhancement which can be approximated by a thermal Bose distribution with a chemical potential that appears as a trace of the nonequilibrium process of its production.