Dilepton emission and the QCD phase transition in ultrarelativistic nuclear collisions

K. Kajantie, J. Kapusta, L. McLerran, A. Mekjian

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The emission of dileptons from a matter distribution undergoing longitudinal hydrodynamic expansion as might be produced in ultrarelativistic nuclear collisions is computed. Contributions come from quark-gluon plasma, from pion gas, and from a mixed phase while the matter undergoes a first-order confinement phase transition. This yield is compared with that expected from other sources. It is found that the signals from quark-gluon plasma and pion gas probably exceed such background for sufficiently high initial temperature. The ratio of dilepton rapidity density to the square of the pion rapidity density may provide a measurement of the phase transition temperature. The dilepton mass distribution for various values of transverse energy may provide a measure of vector-meson masses as a function of temperature, and a mass shift due to the restoration of chiral symmetry might be seen.

Original languageEnglish (US)
Pages (from-to)2746-2754
Number of pages9
JournalPhysical Review D
Issue number9
StatePublished - 1986

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