A QCD description of the ATLAS jet veto measurement

TL;DR

This paper introduces a QCD-based theoretical framework using the Banfi-Marchesini-Smye equation to accurately describe the ATLAS jet veto measurement, capturing soft gluon emissions and non-global logarithms without fitting parameters.

Contribution

It presents a novel QCD description employing the Banfi-Marchesini-Smye equation to model jet veto observables at the LHC, including non-global effects and soft gluon resummation.

Findings

Successfully reproduces the fraction of high-pT di-jet events without additional emissions.

Shows the perturbative series is unstable at large rapidity intervals.

Provides a parameter-free theoretical prediction matching experimental data.

Abstract

We present a new QCD description of the ATLAS jet veto measurement, using the Banfi-Marchesini-Smye equation to constrain the inter-jet QCD radiation. This equation resums emissions of soft gluons at large angles, at leading-logarithmic accuracy, and accounts for both the so-called Sudakov and non-global logarithms. We show that this approach is able to reproduce, with no fitting parameters, the fraction of high-pT forward/backward di-jet events which do not contain additional hard emissions in the inter-jet rapidity range. We also compute the gap fraction in fixed-order perturbation theory to O(alpha_s^2) and show that the perturbative series is unstable at large rapidity intervals.