Photon - Jet Correlations and Constraints on Fragmentation Functions

Z. Belghobsi (1) , M. Fontannaz (2) , J. -Ph. Guillet (3) , G. Heinrich (4) , E. Pilon (3) , M. Werlen (3)

1 Laboratoire de Physique Théorique
2 LPT - Laboratoire de Physique Théorique d'Orsay [Orsay]
3 LAPTH - Laboratoire d'Annecy-le-Vieux de Physique Théorique
4 IPPP - Institute for Particle Physics Phenomenology

We study the production of a large-pT photon in association with a jet in proton-proton collisions. We examine the sensitivity of the jet rapidity distribution to the gluon distribution function in the proton. We then assess the sensitivity of various photon + jet correlation observables to the photon fragmentation functions. We argue that RHIC data on photon-jet correlations can be used to constrain the photon fragmentation functions in a region which was barely accessible in LEP experiments.

Domaines: Physique des Hautes Energies - Phénoménologie [hep-ph]

Z. Belghobsi, M. Fontannaz, J. -Ph. Guillet, G. Heinrich, E. Pilon, et al.. Photon - Jet Correlations and Constraints on Fragmentation Functions. Physical Review D, 2009, 79, pp.114024. ⟨hal-00372636⟩