Phi Mesons from a Hadronic Fireball

Abstract

Production of $\varphi$ mesons is considered in the course of heavy-ion collisions at SPS energies. We investigate the possible difference in momentum distributions of $\varphi$ mesons measured via their leptonic (${\mu }^{+}{\mu }^{-}$) and hadronic ($K^{+}{K}^{-}$) decays. Rescattering of secondary kaons in the dense hadron gas together with the influence of in-medium kaon potential can lead to a relative decrease of a $\varphi$ yield observed in the hadronic channel. We analyze how the in-medium modifications of meson properties affect apparent - reconstructed momentum distributions of $\varphi$ mesons. Quantitative results are presented for central Pb+Pb collisions at $E_{beam}=158GeV/A$.

style Revtex4,9 pages, 5 figures. submitted to Phys. Rev. C

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