1995/08/02 by E. Quack, Quack, E., D. K. Srivastava +1
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #hep-ph
paper · pdf · doi:10.48550/arxiv.hep-ph/9508217
6 pages in ReVTeX. Figures are sent in an extra file
arxiv created 1995/08/02 · arxiv updated 2009/11/30
Direct photon production data at fixed target and collider experiments from pp and pp collisions are analysed in NLO QCD. The results are grouped into three sets having √(s)=20-30 GeV, 630 GeV and 1.8 TeV. It is seen that at the lowest energies considered, the theory systematically underpredicts the results for all the values of the transverse momentum. At the intermediate energy of the UA2 experiment, the data are more accurately described at high pT, and at the highest collider energies no significant underprediction is seen even at low pT, when using recent structure functions as measured at HERA.