Single photons from relativistic collision of lead nuclei at CERN SPS: A reanalysis

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dc.creatorChatterjee, Rupa
dc.creatorSrivastava, Dinesh K.
dc.creatorJeon, Sangyong
dc.date2009-02-06
dc.date.accessioned2026-07-07T13:02:19Z
dc.date.available2026-07-07T13:02:19Z
dc.descriptionWe present a reanalysis of single photon production from relativistic collision of lead nuclei at CERN SPS measured by the WA98 experiment. The refinements include use of iso-spin and shadowing corrected NLO pQCD treatment for prompt photon production using an optimized scale for factorization, renormalization, and fragmentation and use of hydrodynamics suited for non-central collisions along with a well tested equation of state admitting a quark-hadron phase transition. A quantitative explanation of the data requires a large initial temperature (at a small formation time of about 0.2 fm/$c$) and a moderate increase in the prompt yield which could perhaps be attributed to the Cronin effect in nuclei. The data can also be explained using a moderate initial temperature (at a formation time of about 1 fm/$c$) with a very large $K$-factor multiplying the prompt yield. We show that different initial times give rise to different values for the elliptic flow parameter $v_2$ for thermal photons. We also show that a measurement of $v_2$ for thermal photons could also distinguish between the scenarios with or without a phase transition.
dc.description10 pages, 13 figures
dc.identifierhttps://arxiv.org/abs/0902.1036
dc.identifierhttp://arxiv.org/abs/0902.1036
dc.identifierPhys.Rev.C79:034906,2009
dc.identifierdoi:10.1103/PhysRevC.79.034906
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/226413
dc.subjectNuclear Theory
dc.subjectHigh Energy Physics - Phenomenology
dc.subjectNuclear Experiment
dc.titleSingle photons from relativistic collision of lead nuclei at CERN SPS: A reanalysis
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