Jet vetoing at the LHC

TL;DR

This paper investigates the impact of jet vetoes at the LHC, focusing on summing dominant logarithms, assessing super-leading logarithms, and comparing theoretical predictions with HERWIG++ simulations.

Contribution

It introduces a detailed analysis of jet veto effects, including the significance of super-leading logarithms and validation against parton shower models.

Findings

Large corrections from Coulomb gluon exchanges at high jet transverse momentum

Super-leading logarithms can significantly affect predictions

Comparison shows varying accuracy of HERWIG++ in modeling jet veto effects

Abstract

We study the effect of a veto on additional jets in the rapidity region between a pair of high transverse momentum jets at the LHC. We aim to sum the most important logarithms in the ratio of the jet transverse momentum to the veto scale and to that end we attempt to assess the significance of the super-leading logarithms that appear at high orders in the perturbative expansion. We also compare our results to those of HERWIG++, in an attempt to ascertain the accuracy of the angular ordered parton shower. We find that there are large corrections that arise for large enough jet transverse momenta as a consequence of Coulomb gluon exchanges.