Jet angularity measurements for single inclusive jet production

TL;DR

This paper develops a theoretical framework for measuring jet angularities in single-inclusive jet production at the LHC, enabling improved jet shape analysis and quark-gluon discrimination with NLL resummation accuracy.

Contribution

It establishes a factorization theorem within SCET for semi-inclusive jet angularities, including NLL resummation, and compares these to exclusive jet measurements.

Findings

Theoretical predictions for semi-inclusive jet angularities at the LHC.

Demonstrates potential for jet angularities to improve quark-gluon discrimination.

Provides a framework for future experimental measurements.

Abstract

We study jet angularity measurements for single-inclusive jet production at the LHC. Jet angularities depend on a continuous parameter $a$ allowing for a smooth interpolation between different traditional jet shape observables. We establish a factorization theorem within Soft Collinear Effective Theory (SCET) where we consistently take into account in- and out-of-jet radiation by making use of semi-inclusive jet functions. For comparison, we elaborate on the differences to jet angularities measured on an exclusive jet sample. All the necessary ingredients for the resummation at next-to-leading logarithmic (NLL) accuracy are presented within the effective field theory framework. We expect semi-inclusive jet angularity measurements to be feasible at the LHC and we present theoretical predictions for the relevant kinematic range. In addition, we investigate the potential impact of jet angularities for quark-gluon discrimination.