Search for direct photons in p+Pb and p+C collisions at sqrt(sNN) = 17.4 GeV
Christoph Baumann (for the WA98 collaboration)
TL;DR
This paper reports upper limits on direct photon production in p+C and p+Pb collisions at 17.4 GeV, comparing results with Pb+Pb collisions to explore potential thermal photon contributions.
Contribution
It provides the first upper limits on direct photon yields in small collision systems at this energy, offering insights into thermal photon production in heavy-ion collisions.
Findings
Upper limits set on direct photon production for 0.7 < pT <= 3.2 GeV/c.
Comparison with Pb+Pb collisions suggests possible thermal photon contributions.
Results constrain models of photon emission in small collision systems.
Abstract
Upper limits on direct photon production were determined as a function of the transverse momentum for 0.7 < pT <= 3.2 GeV/c with the WA98 experiment in p+C and p+Pb collisions at sqrt(sNN) = 17.4 GeV. The results are compared to direct photon measurements in Pb+Pb collisions at sqrt(sNN) = 17.3 GeV by WA98. Implications for a possible thermal direct photon contribution are discussed.
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