Direct Photon Production in 158 A GeV 208Pb + 208Pb collisions

2000/06/11 by WA Collaboration, WA98 Collaboration, M. M. Aggarwal +1
Physics and Astronomy · #FOS: Physical sciences #High-Energy Particle Collisions Research #Nuclear Experiment (nucl-ex) #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #nucl-ex

paper · pdf · doi:10.48550/arxiv.nucl-ex/0006007

56 pages, 33 figures. Submitted to Phys. Rev. C

openalex publication_date 2000/06/11 · arxiv created 2000/06/13 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

A measurement of direct photon production in 208Pb + 208Pb collisions at 158 A GeV has been carried out in the CERN WA98 experiment. The invariant yield or upper limit of direct photons as a function of transverse momentum in the interval 0.5 < p_T < 4 GeV/c is presented. A significant direct photon excess is observed at p_T > 1.5 GeV/c in central collisions. The results are compared to proton-induced results and to theoretical predictions. Implications for the dynamics of high-energy heavy-ion collisions are discussed.

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