Jet energy scale setting with "Gamma+Jet" events at LHC energies. Detailed study of the background suppression

TL;DR

This paper investigates methods to suppress background events in gamma+jet measurements at LHC, aiming to improve jet energy scale calibration by analyzing background suppression factors and signal efficiency under specific selection criteria.

Contribution

It provides a detailed study of background suppression techniques for gamma+jet events at LHC, focusing on QCD subprocesses and selection criteria to enhance signal detection.

Findings

Quantified background suppression factors.

Estimated signal event numbers at low luminosity.

Analyzed effectiveness of selection criteria.

Abstract

The possibilities of the background events suppression, based on the QCD subprocesses of qg-, gg-, qq- scattering with big cross sections, to the signal \gpj events are studied. Basing on the introduced selection criteria, the background suppression factors and signal events selection efficiencies and the number of the events, that can be collected at LHC with low luminosity L=10^{33}cm^2 s^{-1} during one month of continuous work, are determined.