Dilepton production by bremsstrahlung of meson fields in nuclear collisions

Details Dilepton production by bremsstrahlung of meson fields in nuclear collisions Dilepton production by bremsstrahlung of meson fields in nuclear collisions

1997-09-17

arxiv.org/abs/hep-ph/9709384v1

Phys.Rev.C57:2552-2558,1998

Physics

High Energy Physics

High Energy Physics - Phenomenology

14 pages

Scientific paper

10.1103/PhysRevC.57.2552

We study the bremsstrahlung of virtual omega mesons due to the collective deceleration of nuclei at the initial stage of an ultrarelativistic heavy-ion collision. It is shown that electromagnetic decays of these mesons may give an important contribution to the observed yields of dileptons. Mass spectra of positron-electron and muon pairs produced in central Au+Au collisions are calculated under some simplifying assumptions on the space-time variation of the baryonic current in a nuclear collision process. Comparison with the CERES data for 160 AGev Pb+Au collisions shows that the proposed mechanism gives a noticeable fraction of the observed lepton pairs in the intermediate region of invariant masses. Sensitivity of the dilepton yield to the in-medium modification of masses and widths of vector mesons is demonstrated.

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