Measurement of the associatedγ+μ±production cross section inpp¯collisions ats=1.8TeV

Abstract
We present the first measurement of associated direct photon+muon production in hadronic collisions, from a sample of 1.8 TeV pp¯ collisions recorded with the Collider Detector at Fermilab. Quantum chromodynamics (QCD) predicts that these events are primarily from the Compton scattering process cgcγ, with the final state charm quark producing a muon. Hence this measurement is sensitive to the charm quark content of the proton. The measured cross section of 29±9 pb is compared to a leading-order QCD parton shower model as well as a next-to-leading-order QCD calculation.

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