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Aggarwal, M.M.; Bernier, T.; Delagrange, H.; Luquin, L.; Martinez Garcia, Gines; Mora, M.-J.; Pinganaud, W.; Retiere, F.; Roy, C.; Schutz, Y.
Nuclear physics. A, 2013, Volume: 898Journal Article
Measurements of direct photon production in p+Pb and p+C collisions at $\sqrt{s_\mathrm{NN}} = 17.4\mathrm{GeV}$ are presented. Upper limits on the direct photon yield as a function of $p_\mathrm{T}$ are derived and compared to the results for Pb+Pb collisions at $\sqrt{s_\mathrm{NN}} = 17.3$ GeV. The production of the $\eta$ meson, which is an important input to the direct photon signal extraction, has been determined in the $\eta \rightarrow 2\gamma$ channel for p+C collisions at $\sqrt{s_\mathrm{NN}} = 17.4\mathrm{GeV}$.
