Direct Photon Production in 158 A GeV 208Pb + 208Pb collisions
WA98 Collaboration: M.M.Aggarwal, et al
TL;DR
This paper reports on the measurement of direct photon production in lead-lead collisions at CERN, revealing a significant excess at high transverse momentum, which provides insights into the collision dynamics.
Contribution
It presents the first detailed measurement of direct photons in 158 A GeV Pb+Pb collisions, comparing results with proton-induced data and theoretical models.
Findings
Significant direct photon excess at p_T > 1.5 GeV/c in central collisions
Comparison with proton-induced results shows enhancement in heavy-ion collisions
Results support the presence of hot, dense matter in high-energy heavy-ion collisions
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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Taxonomy
TopicsHigh-Energy Particle Collisions Research · Particle physics theoretical and experimental studies · Quantum Chromodynamics and Particle Interactions