Schwinger tunneling and thermal character of hadron spectra

Abstract

It is shown that an oscillatory character of the solutions of the collisionless kinetic equations describing production of the quark-gluon plasma in strong color fields leads to the exponential (thermal-like) transverse-momentum spectra of partons produced in the soft region (100 MeV < pt < 1 GeV). In addition, the production of partons in the very soft region (pt < 100 MeV) is clearly enhanced above the thermal-like background.