Study of dijet events with large rapidity separation in proton-proton collisions at $\sqrt{s} =$ 2.76 TeV

TL;DR

This paper measures dijet production cross sections with large rapidity separation in proton-proton collisions at 2.76 TeV, comparing results with various theoretical models to study QCD evolution effects.

Contribution

It provides the first detailed measurement of Mueller-Navelet dijet cross sections at this energy, testing BFKL and DGLAP QCD evolution models.

Findings

Cross sections increase with rapidity separation.

Data favor models including BFKL effects.

Jet veto improves sensitivity to BFKL dynamics.

Abstract

The cross sections for inclusive and Mueller-Navelet dijet production are measured as a function of the rapidity separation between the jets in proton-proton collisions at $\sqrt{s} =$ 2.76 TeV for jets with transverse momentum $p_\mathrm{T}$ $\gt$ 35 GeV and rapidity $\vert y\vert$ $\lt$ 4.7. Various dijet production cross section ratios are also measured. A veto on additional jets with $p_\mathrm{T}$ $\gt$ 20 GeV is introduced to improve the sensitivity to the effects of the Balitsky-Fadin-Kuraev-Lipatov (BFKL) evolution. The measurement is compared with the predictions of various Monte Carlo models based on leading-order and next-to-leading-order calculations including the Dokshitzer-Gribov-Lipatov-Altarelli-Parisi leading-logarithm (LL) parton shower as well as the LL BFKL resummation.