O( alphas^2) QCD Corrections to the Electroproduction of Hadrons with High Transverse Momentum

DANIEL DE FLORIAN; ALEJANDRO DALEO; RODOLFO SASSOT

PHYSICAL REVIEW D - PARTICLE AND FILDS

American Physical Society

Año: 2005 vol. 71 p. 1 - 11

0556-2821

We compute the order alphas corrections to the one particle inclusive electroproduction cross section of hadrons with nonvanishing transverse momentum. We perform the full calculation analytically, and obtain the expression of the factorized (finite) cross section at this order. We compare our results with H1 data on forward production of pi0 , and discuss the phenomenological implications of the rather large higher order contributions obtained in that case. Specifically, we analyze the cross section sensitivity to the factoriza- tion and renormalization scales, and to the input fragmentation functions, over the kinematical region covered by data. We conclude that the data is well described by the Order(alphas^2) predictions within the theoretical uncertainties and without the inclusion of any physics content beyond the Dokshitzer-Grivov- Lipatov-Altarelli-Parisi (DGLAP) approach.