Measurement of the photon and jet production with the ATLAS detector

TL;DR

This paper presents precise measurements of photon and jet production at the LHC using ATLAS data, testing perturbative QCD predictions and constraining proton structure functions.

Contribution

It provides the first detailed comparison of photon and jet production cross-sections at 8 and 13 TeV with advanced theoretical models and MC simulations.

Findings

Measured inclusive photon production at 8 and 13 TeV.

Measured inclusive jet production at 13 TeV.

Results agree with NLO QCD predictions within uncertainties.

Abstract

Production of prompt isolated photons at hadron colliders provides a probe of perturbative QCD and can be used to study the gluon density function of the proton. The ATLAS collaboration has performed precise measurements of the inclusive production of isolated prompt photons in 20.2 fb${}^{-1}$ of data collected at $\sqrt{s}=8$ TeV and in 6.4 pb${}^{-1}$ of data collected at $\sqrt{s}=13$ TeV. The measurements are compared with state-of-the-art theory predictions at NLO in QCD and with predictions of several MC generators. Production of inclusive jets at hadron colliders also provides a probe of perturbative QCD. The inclusive jet production cross-section was measured in 78 pb${}^{-1}$ of data collected at $\sqrt{s}=13$ TeV. Results have been compared with (state-of-the-art) theory predictions at NLO in QCD, interfaced with different parton distribution functions.