Eur. Phys. J. C (2011) 71: 1616
https://doi.org/10.1140/epjc/s10052-011-1616-3

Regular Article - Theoretical Physics

NLO calculation of prompt photon production in DIS at HERA

¹ LAPTH, Université de Savoie, CNRS, BP 110, Chemin de Bellevue, 74941, Annecy-le-Vieux Cedex, France
² The Institute of Mathematical Sciences, Chennai, 600 113, India
³ Laboratoire de Physique Théorique, UMR 8627 du CNRS, Université Paris XI, Bâtiment 210, 91405, Orsay Cedex, France

^* e-mail: aurenche@lapp.in2p3.fr

Received: 6 January 2011
Published online: 9 April 2011

Abstract

We present a next-to-leading order calculation of prompt photon production in deep-inelastic scattering. The calculation involves direct, fragmentation and resolved contributions. Inclusive as well as isolated photon production cross sections are presented. The relevance of imposing a transverse momentum cut-off in the virtual-photon proton center-of-mass system rather than in the laboratory frame is discussed. Whenever possible, a comparison of the theoretical results with recent HERA data is carried out.