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



ID: 544660.0, MPI für Physik / MPI für Physik
Inclusive pi^0, eta, and direct photon production at high transverse momentum in p+p and d+Au collisions at sqrt(s_NN) = 200 GeV
Authors:STAR Collaboration; Abelev, B. I.; Schmitz, N.; Seyboth, P.; Simon, F.; et al.
Date of Publication (YYYY-MM-DD):2010
Title of Journal:Physical Review C
Journal Abbrev.:Phys.Rev.C
Issue / Number:81
Start Page:064904
Audience:Not Specified
Intended Educational Use:No
Abstract / Description:We report a measurement of high-p_T inclusive pi^0, eta, and direct photon production in p+p and d+Au collisions at sqrt(s_NN) = 200 GeV at midrapidity (0 < eta < 1). Photons from the decay pi^0 -> gamma gamma were detected in the Barrel Electromagnetic Calorimeter of the STAR experiment at the Relativistic Heavy Ion Collider. The eta -> gamma gamma decay was also observed and constituted the first eta measurement by STAR. The first direct photon cross section measurement by STAR is also presented, the signal was extracted statistically by subtracting the pi^0, eta, and omega(782) decay background from the inclusive photon distribution observed in the calorimeter. The analysis is described in detail, and the results are found to be in good agreement with earlier measurements and with next-to-leading order perturbative QCD calculations.
Classification / Thesaurus:STAR
Comment of the Author/Creator:28 pages, 30 figures, 6 tables, the updated version that was accepted by Phys. Rev. C
External Publication Status:published
Document Type:Article
Communicated by:N.N.
Affiliations:MPI für Physik
Identifiers:LOCALID:MPP-2010-232
URL:http://www.slac.stanford.edu/spires/find/hep/www?r...
URL:http://arXiv.org/abs/arxiv:0912.3838
URL:http://publications.mppmu.mpg.de/?action=search&mp...
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