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

Abstract : The differential cross section for the production of direct photons in p+p collisions at sqrt(s)=200 GeV at midrapidity was measured in the PHENIX detector at the Relativistic Heavy Ion Collider. Inclusive-direct photons were measured in the transverse-momentum range from 5.5--25 GeV/c, extending the range beyond previous measurements. Event structure was studied with an isolation criterion. Next-to-leading-order perturbative-quantum-chromodynamics calculations give a good description of the spectrum. When the cross section is expressed versus x_T, the PHENIX data are seen to be in agreement with measurements from other experiments at different center-of-mass energies.
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http://hal.in2p3.fr/in2p3-00703928
Contributor : Dominique Girod <>
Submitted on : Monday, June 4, 2012 - 3:18:52 PM
Last modification on : Friday, November 13, 2020 - 9:12:02 AM

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A. Adare, Laurent Aphecetche, E. T. Atomssa, A. Baldisseri, H. Borel, et al.. Direct-Photon Production in p+p Collisions at sqrt(s)=200 GeV at Midrapidity. Physical Review D, American Physical Society, 2012, 86, pp.072008. ⟨10.1103/PhysRevD.86.072008⟩. ⟨in2p3-00703928⟩

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