Factorization for Jet Radius Logarithms in Jet Mass Spectra at the LHC

TL;DR

This paper develops an analytic framework for predicting jet mass spectra at the LHC, systematically resumming jet radius logarithms and incorporating realistic jet algorithms and vetoes for improved accuracy.

Contribution

It introduces a complete factorization and resummation method for jet mass spectra that includes jet radius effects beyond leading order, enhancing theoretical predictions.

Findings

Resummation of jet radius logarithms improves spectrum predictions.

Factorization formulas for different jet mass regions are established.

Universal results for nonperturbative effects are provided.

Abstract

To predict the jet mass spectrum at a hadron collider it is crucial to account for the resummation of logarithms between the transverse momentum of the jet and its invariant mass $m_J$. For small jet areas there are additional large logarithms of the jet radius $R$, which affect the convergence of the perturbative series. We present an analytic framework for exclusive jet production at the LHC which gives a complete description of the jet mass spectrum including realistic jet algorithms and jet vetoes. It factorizes the scales associated with $m_J$, $R$, and the jet veto, enabling in addition the systematic resummation of jet radius logarithms in the jet mass spectrum beyond leading logarithmic order. We discuss the factorization formulae for the peak and tail region of the jet mass spectrum and for small and large $R$, and the relations between the different regimes and how to combine them. Regions of experimental interest are classified which do not involve large nonglobal logarithms. We also present universal results for nonperturbative effects and discuss various jet vetoes.