Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1998-11-18
Eur.Phys.J.C9:107-119,1999
Physics
High Energy Physics
High Energy Physics - Phenomenology
22 pages, 3 tables, 10 figures, Latex
Scientific paper
10.1007/s100529900018
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 intrinsic $k_{_T}$ 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.
Aurenche Patrick
Fontannaz Michel
Guillet J.-Ph.
Kniehl Bernd
Pilon Eric
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