Article

# Multiplicity and pseudorapidity distributions of photons in Au+Au collisions at square root of (S(NN)) = 62.4 GeV.

University of Birmingham, Birmingham, United Kingdom.
Physical Review Letters (impact factor: 7.37). 08/2005; 95(6):062301. pp.062301
Source: PubMed

ABSTRACT We present the first measurement of pseudorapidity distribution of photons in the region 2.3 < or = eta < or = 3.7 for different centralities in Au+Au collisions at square root of (S(NN)) = 62.4 GeV. We find that the photon yield scales with the number of participating nucleons at all collision centralities studied. The pseudorapidity distribution of photons, dominated by pi0 decays, has been compared to those of charged pions, photons, and inclusive charged particles from heavy-ion and nucleon-nucleon collisions at various energies. The photon production has been shown to be consistent with the energy and centrality independent limiting fragmentation scenario.

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### Keywords

Au+Au collisions

centrality independent

different centralities

first measurement

heavy-ion

inclusive

nucleon-nucleon collisions

nucleons

photon yield scales

pseudorapidity distribution

various energies