We present a measurement of the cross section and the first measurement of the heavy flavor content of associated direct photon + muon events produced in hadronic collisions. These measurements come from a sample of 1.8 TeV p (p) over bar collisions recorded with the Collider Detector at Fermilab. Quantum chromodynamics (QCD) predicts that these events are primarily due to the Compton scattering process cg-->cgamma, with the final-state charm quark producing a muon. The cross section for events with a photon transverse momentum between 12 and 40 GeV/c is measured to be 46.8+/-6.3+/-7.5 pb, which is two standard deviations below the most recent theoretical calculation. A significant fraction of the events in the sample contain a final-state bottom quark. The ratio of charm to bottom production is measured to be 2.4+/-1.2, in good agreement with QCD models.

Cross section and heavy quark composition of gamma+mu events produced in p(p)over-bar collisions

BISELLO, DARIO;BUSETTO, GIOVANNI;LUCCHESI, DONATELLA;MARIOTTI, MOSE';ROSSIN, ROBERTO;
2002

Abstract

We present a measurement of the cross section and the first measurement of the heavy flavor content of associated direct photon + muon events produced in hadronic collisions. These measurements come from a sample of 1.8 TeV p (p) over bar collisions recorded with the Collider Detector at Fermilab. Quantum chromodynamics (QCD) predicts that these events are primarily due to the Compton scattering process cg-->cgamma, with the final-state charm quark producing a muon. The cross section for events with a photon transverse momentum between 12 and 40 GeV/c is measured to be 46.8+/-6.3+/-7.5 pb, which is two standard deviations below the most recent theoretical calculation. A significant fraction of the events in the sample contain a final-state bottom quark. The ratio of charm to bottom production is measured to be 2.4+/-1.2, in good agreement with QCD models.
2002
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11577/2536887
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