Measurement of the differential cross section for the production of an isolated photon with associated jet in pp collisions at √s = 1.96 TeV

Authors

V. M. Abazov, Joint Institute for Nuclear Research, Dubna, Russia
Kenneth A. Bloom, University of Nebraska-LincolnFollow
Gregory Snow, University of Nebraska-LincolnFollow
DØ Collaboration

Date of this Version

June 2008

Comments

Published in Physics Letters B 666 (2008) 435–445.

Abstract

The process pp → γ + jet + X is studied using 1.0 fb⁻¹ of data collected by the D0 detector at the Fermilab Tevatron pp collider at a center-of-mass energy √s = 1.96 TeV. Photons are reconstructed in the central rapidity region |y^γ | < 1.0 with transverse momenta in the range 30 < p^γ_T < 400 GeV while jets are reconstructed in either the central |y^jet| < 0.8 or forward 1.5 < |y^jet| < 2.5 rapidity intervals with p^jet_T > 15 GeV. The differential cross section d³σ/dp^γ_T dy^γ dy^jet is measured as a function of p^γ_T in four regions, differing by the relative orientations of the photon and the jet in rapidity. Ratios between the differential cross sections in each region are also presented. Next-to-leading order QCD predictions using different parameterizations of parton distribution functions and theoretical scale choices are compared to the data. The predictions do not simultaneously describe the measured normalization and p^γ_T dependence of the cross section in the four measured regions.