Study of jet quenching with isolated-photon+jet correlations in PbPb and pp collisions at [formula omitted

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Traczyk ,M Gouzevitch ,N Woods

doi:10.1016/j.physletb.2018.07.061

Abstract

Measurements of azimuthal angle and transverse momentum (pT ) correlations of isolated photons and associated jets are reported for pp and PbPb collisions at sNN=5.02 TeV. The data were recorded with the CMS detector at the CERN LHC. For events containing a leading isolated photon with pTγ>40 GeV/c and an associated jet with pTjet>30 GeV/c, the photon+jet azimuthal correlation and pT imbalance in PbPb collisions are studied as functions of collision centrality and pTγ. The results are compared to pp reference data collected at the same collision energy and to predictions from several theoretical models for parton energy loss. No evidence of broadening of the photon+jet azimuthal correlations is observed, while the ratio pTjet/pTγ decreases significantly for PbPb data relative to the pp reference. All models considered agree within uncertainties with the data. The number of associated jets per photon with pTγ>80 GeV/c is observed to be shifted towards lower pTjet values in central PbPb collisions compared to pp collisions.

Highlights

Quantum chromodynamics predicts that in relativistic heavy ion collisions a state of deconfined quarks and gluons known as the quark-gluon plasma (QGP) can be formed [1, 2]
In the results reported in this paper, the electroweak boson is an isolated photon, which is selected experimentally by using an isolation requirement, namely that the additional energy in a cone of fixed radius around the direction of the reconstructed photon is less than a specified value [23, 24]
Possible modification of the back-to-back photon and recoiling jet alignment by the medium can be studied by comparing the relative azimuthal angle (∆φjγ) distributions in pp and PbPb collisions [16, 17]

Summary

Introduction

Quantum chromodynamics predicts that in relativistic heavy ion collisions a state of deconfined quarks and gluons known as the quark-gluon plasma (QGP) can be formed [1, 2]. The study of correlations in boson-jet events, such as the azimuthal angle (φ) difference and pT ratio between the boson and the associated jets, opens the possibility for in-depth studies of the parton energy loss mechanisms utilizing theoretically well-controlled initial production processes. These studies facilitate the extraction of QGP properties via comparisons with theoretical models [31, 33,34,35,36,37]. The precision of these previous measurements was limited by the available number of boson-jet pairs

Methods

Results

Conclusion