Direct-Photon Production in p+p Collisions at sqrt(s)=200 GeV at   Midrapidity
  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. 
A. Adare, S. Afanasiev, C. Aidala, N. N. Ajitanand, Y. Akiba, H.   Al-Bataineh, J. Alexander, K. Aoki, L. Aphecetche, J. Asa...
hep-ex nucl-ex