Exploring double-parton scattering effects for jets with large rapidity separation and in four-jet production at the LHC

TL;DR

This paper estimates the contribution of double parton scattering (DPS) in jets with large rapidity separation and four-jet production at the LHC, showing DPS becomes more significant at large rapidity gaps and aligning well with CMS data.

Contribution

It provides the first detailed estimation of DPS effects in four-jet production at the LHC, comparing LO calculations with experimental data and BFKL predictions.

Findings

DPS contribution grows with increasing rapidity distance between jets.

Good agreement between DPS estimates and CMS four-jet data.

Proposed cuts can enhance the visibility of DPS effects.

Abstract

We present an estimation of the contribution of double parton scattering (DPS) for jets widely separated in rapidity and for four-jet sample. In the case of four-jet production we calculate cross section for both single-parton scattering (SPS) using the code ALPGEN as well as for DPS in LO collinear approach. The DPS contribution is calculated within the so-called factorized Ansatz and each step of DPS is calculated in the LO collinear approximation. We show that the relative (with respect to SPS dijets and to the BFKL Mueller-Navelet (MN) jets) contribution of DPS is growing at large rapidity distance between jets. The calculated differential cross sections as a function of rapidity distance between the most remote in rapidity jets are compared with recent results of LL and NLL BFKL calculations for the Mueller-Navelet jet production at $\sqrt{s} = 7$ TeV. Our results for four-jet sample are compared with experimental data obtained recently by the CMS collaboration and a rather good agreement is achieved. We propose to impose different cuts in order to enhance the relative DPS contribution. The relative DPS contribution increases when decreasing the lower cut on the jet transverse momenta as well as when a low lower cut on the rapidity distance between the most remote jets is imposed.