DOI 10.1007/s100529900018
A critical phenomenological study of inclusive photon production in hadronic collisions
P. Aurenche1 - M. Fontannaz2 - J.Ph. Guillet1 - B. Kniehl3 - E. Pilon1 - M. Werlen1
1 Laboratoire d'Annecy-le-Vieux de Physique Théorique LAPTH,
B.P. 110, F-74941 Annecy-le-Vieux Cedex, France
2
Laboratoire de Physique Théorique et Hautes Energies LPTHE,
Bât. 211, Université de Paris-Sud, F-91405 Orsay Cedex,
France
3 Max-Planck-Institut für Physik
(Werner-Heisenberg-Institut),
Föhringer Ring 6, D-80805 München, Germany
Received: 23 November 1998 / Published online: 22 March 1999
Abstract
We discuss fixed target and ISR inclusive photon production and attempt
a comparison between theory and experiments. The dependence of the
theoretical predictions on the structure functions, and on the
renormalization and factorization scales is investigated. The main
result of this study is that the data cannot be simultaneously fitted
with a single set of scales and structure functions. On the other hand,
there is no need for an additional primordial kT to force the
agreement between QCD predictions and experiments, with the possible
exception of one data set. Since the data cover almost overlapping
kinematical ranges this raises the question of consistency among data
sets. A comparative discussion of some possible sources of experimental
uncertainties is sketched.
Copyright Springer-Verlag
