photon+jet process application for setting the absolute scale of jet energy and determining the gluon distribution at the LHC

TL;DR

This paper explores using photon+jet events at the LHC to calibrate jet energy scale and to measure the gluon distribution in protons in previously unexplored kinematic regions.

Contribution

It introduces a method for jet energy calibration and gluon distribution measurement using photon+jet processes at the LHC, extending the kinematic reach beyond HERA data.

Findings

Photon+jet events can effectively calibrate jet energy scale.

The method allows probing gluon distribution at new x, Q^2 regions.

Estimated event rates support feasibility of the approach.

Abstract

The possibility of jet energy scale setting at the CMS calorimeter by using photon+jet process is studied. The estimation of the number of photon+jet events suitable for determination of gluon distribution inside a proton in a new kinematic region of x, Q^2 variables beyond the one covered by HERA data is also presented.