8 research outputs found
Cross Section and Heavy Quark Composition of Photon+Muon Events Produced in ppbar Collisions
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 ppbar
collisions recorded with the Collider Detector at Fermilab. Quantum
chromodynamics (QCD) predicts that these events are primarily due to Compton
scattering process charm+gluon -> charm+photon, 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 prediction. 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.Comment: 15 pages, 5 figure