# Measurement of direct photon production in p + p collisions at $\sqrt{s}$ = 200 GeV

Abstract : Cross sections for mid-rapidity production of direct photons in p+p collisions at the Relativistic Heavy Ion Collider (RHIC) are reported for 3 < p_T < 16 GeV/c. Next-to-leading order (NLO) perturbative QCD (pQCD) describes the data well for p_T > 5 GeV/c, where the uncertainties of the measurement and theory are comparable. We also report on the effect of requiring the photons to be isolated from parton jet energy. The observed fraction of isolated photons is well described by pQCD for p_T > 7 GeV/c.
Document type :
Journal articles

http://hal.in2p3.fr/in2p3-00132117
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Submitted on : Tuesday, February 20, 2007 - 12:44:54 PM
Last modification on : Tuesday, April 20, 2021 - 12:00:09 PM

### Citation

S. S. Adler, S. Afanasiev, C. Aidala, N.N. Ajitanand, Y. Akiba, et al.. Measurement of direct photon production in p + p collisions at $\sqrt{s}$ = 200 GeV. Physical Review Letters, American Physical Society, 2007, 98, pp.012002. ⟨10.1103/PhysRevLett.98.012002⟩. ⟨in2p3-00132117⟩

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