Physics – Nuclear Physics – Nuclear Theory
Scientific paper
1999-10-07
Nucl.Phys. A671 (2000) 567-582
Physics
Nuclear Physics
Nuclear Theory
23 pages, revtex, 9 figures, added discussion on higher order effects
Scientific paper
10.1016/S0375-9474(99)00833-7
We study high mass dilepton production from gluon-induced processes, $g q \to q \gamma^*$, $g \bar q \to \bar q \gamma^*$, and $g g \to q \bar q \gamma^*$, in a thermally equilibrated but chemically under-saturated partonic matter that is expected to be created in the initial stage of ultra-relativistic heavy ion collisions. Regulating the divergence in these processes by the thermal quark mass, we find that gluon-induced processes are more important than the leading-order $q\bar q$ annihilation process as a result of the larger number of gluons than quarks in the partonic matter. The dependence of the thermal dilepton yield from the partonic stage of heavy ion collisions on the initial conditions for the partonic matter is also studied. We further discuss the feasibility of observing thermal dileptons from the quark-gluon plasma in heavy ion experiments.
Ko Che Ming
Lin Zi-wei
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