Eur. Phys. J. C (2016) 76: 165
https://doi.org/10.1140/epjc/s10052-016-3963-6

Regular Article - Theoretical Physics

Multi-Regge kinematics and azimuthal angle observables for inclusive four-jet production

¹ Instituto de Física Teórica UAM/CSIC, Nicolás Cabrera 15, Madrid, Spain
² Universidad Autónoma de Madrid, 28049, Madrid, Spain
³ Dipartimento di Fisica, Università della Calabria, Arcavacata di Rende, 87036, Cosenza, Italy
⁴ Istituto Nazionale di Fisica Nucleare, Gruppo Collegato di Cosenza, Arcavacata di Rende, 87036, Cosenza, Italy

^* e-mail: francescogiovanni.celiberto@fis.unical.it

Received: 14 December 2015
Accepted: 21 February 2016
Published online: 25 March 2016

Abstract

We evaluate differential cross sections for production of four jets in multi-Regge kinematics at a hadron collider. The main focus lies on the azimuthal angle dependences. As in previous studies, the ratios of correlation functions of products of cosines of azimuthal angle differences among the tagged jets offer us the cleanest quantities to compare with the experimental data. The calculations are based on the jet production from a single BFKL ladder with a convolution of three BFKL Green functions where we always have two forward/backward jets tagged in the final state. We also demand the tagging of two further jets in more central regions of the detectors with a relative separation in rapidity from each other, plus the inclusive production of an arbitrary number of mini-jets. We show that dependences on the transverse momenta and rapidity of the two central jets can be a distinct signal of the onset of BFKL dynamics.