Eur. Phys. J. C (2008) 57: 681-688
https://doi.org/10.1140/epjc/s10052-008-0731-2

Regular Article - Theoretical Physics

Jet–jet and hadron–jet correlations in hadro- and electroproduction

¹ Laboratoire d’Annecy-le-Vieux de Physique Théorique, UMR 5108 du CNRS, Université de Savoie, CNRS, B.P. 110, 74941, Annecy-le-Vieux Cedex, France
² The Institute of Mathematical Sciences, Chennai, 600 113, India
³ Laboratoire de Physique Théorique, UMR 8627 CNRS, Université Paris XI, Bâtiment 210, 91405, Orsay Cedex, France

^* e-mail: rahul@imsc.res.in

Received: 18 July 2008
Published online: 13 September 2008

Abstract

We discuss, in the framework of perturbative QCD at next to leading order, two related observables which are usually considered to provide tests of the BFKL dynamics: jet–jet correlations at Tevatron energies and forward particle–jet correlations at HERA. In the first case we study the rapidity gap dependence of the azimuthal correlations and find slightly too strong correlations at large gap. In the second case we discuss the cross section as well as the azimuthal correlations over a rapidity gap range of 5 units. We find that the requirement of a forward particle imposes strong kinematical constraints which distort the distributions, notably at small rapidity gaps. We also show that the decorrelation is stronger in electroproduction than in hadron–hadron collisions. Unfortunately data are not yet available for comparison.