12 research outputs found
A new critical study of photon production in hadronic collisions
In the light of the new prompt photon data collected by PHENIX at RHIC and by
D0 at the run II of the Tevatron, we revisit the world prompt photon data, both
inclusive and isolated, in hadronic collisions, and compare them with the NLO
QCD calculations implemented in the Monte Carlo programme JETPHOX.Comment: 19 pages; 12 figure
Cross section of isolated prompt photons in hadron-hadron collisions
We consider the production of isolated prompt photons in hadronic collisions.
We present a general discussion in QCD perturbation theory of the isolation
criterion used by hadron collider experiments. The isolation criterion is
implemented in a computer programme of the Monte Carlo type, which evaluates
the production cross section at next-to-leading order accuracy in perturbative
QCD. The calculation includes both the direct and the fragmentation components
of the cross section, without any approximation of the dependence on the radius
R of the isolation cone. We examine the scale dependence of the isolated cross
section, the sensitivity of the cross section to the values of the isolation
parameters, and we provide a quantitative comparison between the full R
dependence and its small-R approximation.Comment: 29 pages, 1 figure, few comments slightly expanded, results
unchanged, misprints correcte
Electroproduction Cross Section of Large_Et Hadrons at NLO and Virtual Photon Structure Function
Latex, 32 pages with 6 figuresWe calculate Higher Order corrections to the resolved component of the electroproduction cross section of large-Et hadrons. The parton distributions in the virtual photon are studied in detail and a NLO parametrization of the latter is proposed. The contribution of the resolved component to the forward production of large-Et hadrons is calculated and its connection with the BFKL cross section is discussed