Direct photons from relativistic heavy-ion collisions

Details Direct photons from relativistic heavy-ion collisions Direct photons from relativistic heavy-ion collisions

2008-05-22

arxiv.org/abs/0805.3401v2

J.Phys.G35:104026,2008

Physics

Nuclear Physics

Nuclear Theory

Invited Plenary Talk at Quark Matter 2008, Jaipur, India. 10 pages, 7 eps figures

Scientific paper

10.1088/0954-3899/35/10/104026

We recall the seminal developments in the study of radiation of direct photons from relativistic heavy ion collisions, which have helped to enhance the scope of single photons as a probe of the quark gluon plasma considerably. There is a mounting evidence that in addition to providing information about the initial temperature of the plasma as envisaged originally, these radiations measure the momentum anisotropy of the deconfined quarks and gluons, energy loss of the quarks, the initial spatial asymmetry of the plasma, and the history of evolution of the system. After a brief description of the theoretical developments and results for direct photons at SPS energies, we discuss the expectations and findings at RHIC.

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