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Physical Review D 86 (2012) 072008
Direct-Photon Production in p+p Collisions at sqrt(s)=200 GeV at Midrapidity
A. Adare, L. Aphecetche1, E. T. Atomssa2, A. Baldisseri3, H. Borel3, J. -L. Charvet3, T. Dahms2, D. d'Enterria2, O. Drapier2, F. Fleuret2, M. Gonin2, J. Gosset3, R. Granier de Cassagnac2, A. Hadj Henni1, D. Jouan4, B. Lenzi3, M. Nguyen2, H. Pereira3, A. Rakotozafindrabe3, G. Roche5, P. Rosnet5, C. Silvestre3, F. Staley3, C. Suire4, V-N. Tram2
PHENIX Collaboration(s)
(2012)

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.
1 :  SUBATECH - Laboratoire SUBATECH Nantes
2 :  LLR - Laboratoire Leprince-Ringuet
3 :  IRFU - Institut de Recherches sur les lois Fondamentales de l'Univers (ex DAPNIA)
4 :  IPNO - Institut de Physique Nucléaire d'Orsay
5 :  LPC-CLERMONT - Laboratoire de Physique Corpusculaire de Clermont-Ferrand
Physique/Physique des Hautes Energies - Expérience

Physique/Physique Nucléaire Expérimentale
Lien vers le texte intégral : 
http://fr.arXiv.org/abs/1205.5533