Mid-Rapidity Direct-Photon Production in p+p Collisions at sqrt(s) = 200 GeV

Abstract

A measurement of direct photons in p+p collisions at sqrt(s)=200 GeV is presented. A photon excess above background from pi^0 --> gamma+gamma, eta --> gamma+gamma, and other decays is observed in the transverse momentum range 5.5 < p_T < 7 GeV/c. The result is compared to a next-to-leading-order perturbative QCD calculation. Within errors, good agreement is found between the QCD calculation and the measured result.

arXiv comment330 authors, 7 pages text, RevTeX, 2 figures, 2 tables. Submitted to Physical Review D. Plain text data tables for the points plotted in figures for this and previous PHENIX publications are (or will be) publicly available at http://www.phenix.bnl.gov/papers.html

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• New Generation of Parton Distributions with Uncertainties from Global QCD Analysis
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• Mid-Rapidity Neutral Pion Production in Proton-Proto Collisions at sqrt(s_NN) = 200 GeV
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• Quark helicity distributions from longitudinal spin asymmetries in muon-proton and muon-deuteron scattering
• Measurement of direct photon production in p + p collisions at sqrt(s) = 200 GeV
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• Single Electrons from Heavy Flavor Decays in p+p Collisions at sqrt(s) = 200 GeV
• Sensitivity of isolated photon production at TeV hadron colliders to the gluon distribution in the proton
• Centrality Dependence of Direct Photons in Au+Au Collisions at sqrt(s_NN) = 200 GeV
• Investigating the high energy QCD approaches for prompt photon production at the LHC
• Parton transverse momenta and direct photon production in hadronic collisions at high energies
• Thermal photon to dilepton ratio in ultra-relativistic heavy ion collisions
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• Towards an understanding of nucleon spin structure: from hard to soft scales
• Probing Dense Partonic Matter at RHIC
• Measurement of the Transverse Single-Spin Asymmetry for Mid-rapidity Production of Neutral Pions in Polarized p+p Collisions at 200 GeV Center-of-Mass Energy
• Measurement of direct photons in s(NN)**1/2 = 200 GeV p+p and Au+Au collisions with the PHENIX Experiment at RHIC
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