Jet-jet and hadron-jet correlations in hadro- and electro-production

Understand

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.