Eur. Phys. J. C (2009) 61: 871-878
https://doi.org/10.1140/epjc/s10052-008-0842-9

Regular Article - Theoretical Physics

Investigating the high-energy QCD approaches for prompt-photon production at the LHC

¹ Centro de Ciências Exatas e Tecnológicas, Universidade Federal do Pampa, Campus de Bagé, Rua Carlos Barbosa, 96400-970, Bagé, RS, Brazil
² Departamento de Física, Universidade Federal do Rio Grande, Box 474, 96201-900, Rio Grande, RS, Brazil

^* e-mail: magno.machado@unipampa.edu.br

Received: 10 September 2008
Published online: 9 January 2009

Abstract

We investigate the rapidity and transverse-momentum distributions of the prompt photon production at the CERN LHC energies considering the current perturbative QCD approaches for this scattering process. Namely, we compare the predictions from the usual NLO pQCD calculations to the color-dipole formalism, using distinct dipole cross sections. Special attention is paid to parton-saturation models at high energies, which are expected to be important at the forward rapidities in pp collisions (  TeV) at the LHC.