Direct hadron production in ultrarelativistic heavy-ion collisions

Abstract

Hadrons emitted by the pre-surface layer of a quark-gluon plasma (QGP) before the phase transition into a hadronic gas are considered as possible sources of direct information about QGP. It is shown that if QGP is created in ultrarelativistic heavy-ion collisions, then these hadrons strongly contribute at soft p t at SpS energy and dominate up to an order of magnitude at LHC energy.