Direct emission of light mesons from quark-gluon plasma surface

Original · EN

On the basis of hydrodynamic model of evolution of heavy ion collision we consider emission of π,K,η,ρ,ω,K* mesons directly from the surface of quark-gluon plasma, with accounting of their absorption by surrounding plasma hadronic gas. We evaluate upper and lower limits on yields of these direct mesons in Pb+Pb collision at 158 AGeV (SpS) and 3150+3150 AGeV (LHC), and find, that even in the case of the lowest yield, direct η and heavier mesons dominate at LHC energy at soft pₜ (pₜ≤ 0.5 GeV/c). This enhancement of the low pₜ meson production can be considered as a quark-gluon plasma signature.