Flash of photons from the early stage of heavy-ion collisions

Details Flash of photons from the early stage of heavy-ion collisions Flash of photons from the early stage of heavy-ion collisions

1998-02-11

arxiv.org/abs/nucl-th/9802034v1

Phys.Rev.C58:1734-1737,1998

Physics

Nuclear Physics

Nuclear Theory

4 pages including 3 postscript figures

Scientific paper

10.1103/PhysRevC.58.1734

The dynamics of partonic cascades may be an important aspect for particle production in relativistic collisions of nuclei at CERN SPS and BNL RHIC energies. Within the Parton-Cascade Model, we estimate the production of single photons from such cascades due to scattering of quarks and gluons q g -> q gamma, quark-antiquark annihilation q qbar -> g gamma, or gamma gamma, and from electromagnetic brems-strahlung of quarks q -> q gamma. We find that the latter QED branching process plays the dominant role for photon production, similarly as the QCD branchings q -> q g and g -> g g play a crucial role for parton multiplication. We conclude therefore that photons accompanying the parton cascade evolution during the early stage of heavy-ion collisions shed light on the formation of a partonic plasma.

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