Isolated Photons at Hadron Colliders at O($\alpha alph{a}_s^2$) (I): Spin Averaged Case

Abstract

The cross sections for isolated and non-isolated prompt photon production with unpolarized hadron beams are studied at order $\alpha {\alpha }_s^2$. Two methods of performing the calculations are compared. One uses purely analytic techniques and the second uses a combination of analytic and Monte Carlo techniques to perform the phase-space integrations. The results of the analytic and Monte Carlo methods are compared both before and after isolation cuts are placed on the photon. Fragmentation contributions are included at next-to-leading order in the analytic case, and the question of the infrared sensitivity of this contribution once isolation is implemented is addressed. Numerical results are presented and compared with the latest CDF data for $p\bar{p}\to \gamma +X$ using the latest parton densities for the proton.

29 pages, 14 figures

References in corpus (5)

• Improved Parton Distributions from Global Analysis of Recent Deep Inelastic Scattering and Inclusive Jet Data
• Parton distributions: a study of the new HERA data, ${\alpha }_s$, the gluon and $p\bar{p}$ jet production
• Breakdown of Conventional Factorization for Isolated Photon Cross Sections
• Multiple Parton Emission Effects in Next-to-Leading Order Direct Photon Production
• Isolated Prompt Photon Production in Hadronic Final States of $e^{+}{e}^{-}$ Annihilation

Cited by in corpus (11)

• Theory of hard photoproduction
• Direct Photons from Relativistic Heavy-Ion Collisions
• kt Effects in Direct-Photon Production
• Survey of present data on photon structure functions and resolved photon processes
• Massive Lepton Pairs as a Prompt Photon Surrogate
• Radiative Corrections to the Photon + 1 Jet Rate at LEP
• Spin Dependence of Massive Lepton Pair Production in Proton-Proton Collisions
• Isolated Photons at Hadron Colliders at O(αalpha_s^2) (II): Spin Dependent Case
• Spin Structure of the Proton and Large p_T Processes in Polarized pp Collisions
• Rapidity Correlations and $\Delta G$ from Prompt Photon plus Jet Production in Polarized $pp$ Collisions
• Spin Dependence of Associated Production of a Prompt Photon and a Charm Quark at Next-to-Leading Order in QCD