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Article
Report number	hep-ph/0103044 ; CERN-TH-2001-080 ; HD-THEP-2001-13
Title	Hard Thermal Photon Production in Relativistic Heavy Ion Collisions
Author(s)	Steffen, Frank D. (Heidelberg U.) ; Thoma, Markus H. (CERN)
Affiliation	(ITP Heidelberg) ; (CERN)
Publication	2001
Imprint	4 Mar 2001
Number of pages	16
Note	16 pages with 5 figures; footnote added, corrected Fig. labels, to be published in Phys. Lett. B Report-no: CERN-TH/2001-080, HD-THEP-01-13
In:	Phys. Lett. B 510, 1-4 (2001) pp.98-106
DOI	10.1016/j.physletb.2007.11.020 10.1016/S0370-2693(01)00525-1
Subject category	Particle Physics - Phenomenology
Abstract	The recent status of hard thermal photon production in relativistic heavy ion collisions is reviewed and the current rates are presented with emphasis on corrected bremsstrahlung processes in the quark-gluon plasma (QGP) and quark-hadron duality. Employing Bjorken hydrodynamics with an EOS supporting the phase transition from QGP to hot hadron gas (HHG), thermal photon spectra are computed. For SPS 158 GeV Pb+Pb collisions, comparison with other theoretical results and the WA98 direct photon data indicates significant contributions due to prompt photons. Extrapolating the presented approach to RHIC and LHC experiments, predictions of the thermal photon spectrum show a QGP outshining the HHG in the high-pT-region.
Copyright/License	Elsevier Science B.V.

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