Bremsstrahlung of a Quark Propagating through a Nucleus
B. Z. Kopeliovich, A. Schaefer, A. V. Tarasov
Abstract
The density of gluons produced in the central rapidity region of a heavy ion collision is poorly known. We investigate the influence of the effects of quantum coherence on the transverse momentum distribution of photons and gluons radiated by a quark propagating through nuclear matter. We describe the case that the radiation time substantially exceeds the nuclear radius (the relevant case for RHIC and LHC energies), which is different from what is known as Landau-Pomeranchuk-Migdal effect corresponding to an infinite medium. We find suppression of the radiation spectrum at small transverse photon/gluon momentum kT, but enhancement for kT>1GeV. Any nuclear effects vanish for kT > 10GeV. Our results allow also to calculate the kT dependent nuclear effects in prompt photon, light and heavy (Drell-Yan) dilepton and hadron production.
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