Mid-Rapidity Direct-Photon Production in p+p Collisions at sqrt(s) = 200 GeV
PHENIX Collaboration, S. Adler, et al
TL;DR
This paper reports the measurement of direct photon production in proton-proton collisions at 200 GeV, showing a photon excess in a specific transverse momentum range that agrees with perturbative QCD predictions.
Contribution
First measurement of direct photons at 200 GeV in p+p collisions, providing data for testing QCD calculations.
Findings
Photon excess observed in 5.5 < p_T < 7 GeV/c range.
Measured results agree with next-to-leading-order perturbative QCD.
Data supports QCD predictions for direct photon production.
Abstract
A measurement of direct photons in p+p collisions at sqrt(s)=200 GeV is presented. A photon excess above background from pi^0 --> gamma+gamma, eta --> gamma+gamma, and other decays is observed in the transverse momentum range 5.5 < p_T < 7 GeV/c. The result is compared to a next-to-leading-order perturbative QCD calculation. Within errors, good agreement is found between the QCD calculation and the measured result.
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