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          Institute: MPI für Physik     Collection: MPI für Physik     Display Documents

ID: 544669.0, MPI für Physik / MPI für Physik
Center of mass energy and system-size dependence of photon production at forward rapidity at RHIC
Authors:STAR Collaboration; Abelev, B. I.; Schmitz, N.; Seyboth, P.; Simon, F.; et al.
Date of Publication (YYYY-MM-DD):2010
Title of Journal:Nuclear Physics A
Journal Abbrev.:Nucl.Phys.A
Issue / Number:832
Start Page:134
End Page:147
Audience:Not Specified
Intended Educational Use:No
Abstract / Description:We present the multiplicity and pseudorapidity distributions of photons produced in Au+Au and Cu+Cu collisions at \sqrt{s_NN} = 62.4 and 200 GeV. The photons are measured in the region -3.7 < \eta < -2.3 using the photon multiplicity detector in the STAR experiment at RHIC. The number of photons produced per average number of participating nucleon pairs increases with the beam energy and is independent of the collision centrality. For collisions with similar average numbers of participating nucleons the photon multiplicities are observed to be similar for Au+Au and Cu+Cu collisions at a given beam energy. The ratios of the number of charged particles to photons in the measured pseudorapidity range are found to be 1.4 +/- 0.1 and 1.2 +/- 0.1 for \sqrt{s_NN} = 62.4 GeV and 200 GeV, respectively. The energy dependence of this ratio could reflect varying contributions from baryons to charged particles, while mesons are the dominant contributors to photon production in the given kinematic region. The photon pseudorapidity distributions normalized by average number of participating nucleon pairs, when plotted as a function of \eta - ybeam, are found to follow a longitudinal scaling independent of centrality and colliding ion species at both beam energies.
Classification / Thesaurus:STAR
Comment of the Author/Creator:19 pages and 5 figures, Accepted for publication in Nuclear Physics A
External Publication Status:published
Document Type:Article
Communicated by:N.N.
Affiliations:MPI für Physik
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