Measurement of direct photon production at Tevatron fixed target energies
Fermilab E706 Collaboration: L. Apanasevich, et al
TL;DR
This paper reports measurements of high transverse momentum direct photon production at Tevatron fixed target energies, comparing experimental data with QCD predictions and phenomenological models.
Contribution
It provides new experimental data on direct photon production at specific energies and kinematic ranges, and compares these results with theoretical models.
Findings
Data agrees with NLO QCD calculations within uncertainties.
Phenomenological parton-k_T model describes the data well.
Results help constrain parton distribution functions and QCD models.
Abstract
Measurements of the production of high transverse momentum direct photons by a 515 GeV/c piminus beam and 530 and 800 GeV/c proton beams in interactions with beryllium and hydrogen targets are presented. The data span the kinematic ranges of 3.5 < p_T < 12 GeV/c in transverse momentum and 1.5 units in rapidity. The inclusive direct-photon cross sections are compared with next-to-leading-order perturbative QCD calculations and expectations based on a phenomenological parton-k_T model.
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