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Physical Review D 86 (2012) 072008
Direct photon production in d+Au collisions at sqrt(s_NN)=200 GeV at midrapidity
A. Adare, E. T. Atomssa1, A. Baldisseri2, H. Borel2, Xavier Camard3, 4, J. -L. Charvet2, Y. Cobigo2, Jean-Pierre Cussonneau3, 4, T. Dahms1, Hugues Delagrange3, 4, O. Drapier1, C. Finck3, F. Fleuret1, S. Gadrat5, M. Gonin1, J. Gosset2, R. Granier de Cassagnac1, Ahmed Hadj Henni3, 4, B. Lenzi2, Ginés Martinez3, 4, M. Nguyen1, H. Pereira2, A. Rakotozafindrabe2, G. Roche5, P. Rosnet5, Yves Schutz3, 4, F. Staley2, V-N. Tram1
(2012)

The differential cross section for the production of direct photons in p+p collisions at √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 xT, the PHENIX data are seen to be in agreement with measurements from other experiments at different center-of-mass energies.
1 :  LLR - Laboratoire Leprince-Ringuet
2 :  IRFU - Institut de Recherches sur les lois Fondamentales de l'Univers (ex DAPNIA)
3 :  SUBATECH - Laboratoire SUBATECH Nantes
4 :  EM NANTES - École nationale supérieure des Mines de Nantes
5 :  LPC - Laboratoire de Physique Corpusculaire [Clermont-Ferrand]
Physique/Physique Nucléaire Expérimentale
Lien vers le texte intégral : 
http://fr.arXiv.org/abs/1208.1234