Photon multiplicity measurements at forward rapidity in the ALICE experiment at CERN

Details Photon multiplicity measurements at forward rapidity in the ALICE experiment at CERN Photon multiplicity measurements at forward rapidity in the ALICE experiment at CERN

2011-03-09

arxiv.org/abs/1103.1668v1

Nucl.Phys.A862-863:279-282,2011

Physics

High Energy Physics

High Energy Physics - Experiment

4 pages, 6 figures

Scientific paper

10.1016/j.nuclphysa.2011.05.091

We present the first preliminary results on photon multiplicity measurements at LHC at forward pseudorapidity (2.3 $\textless$ $\eta$ $\textless$ 3.9) in proton-proton ($pp$) collisions at $\sqrt{s}$ = 7 TeV. The multiplicity distribution is found to be reasonably well explained by a double Negative Binomial Distribution (NBD). The average photon multiplicity increases logarithmically with $\sqrt{s}$. It is found that none of the models we used (PYTHIA6D6T, PHOJET, and HERWIG) could explain the data.

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