Measurement of isolated photon-hadron correlations in $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV pp and p-Pb collisions

Abstract

This paper presents isolated photon-hadron correlations using pp and p-Pb data collected by the ALICE detector at the LHC. For photons with |$\eta$| < 0.67 and 12 < $p_{\mathrm{T}}$ < 40 GeV/$c$, the associated yield of charged particles in the range |$\eta$| < 0.80 and 0.5 < $p_{\mathrm{T}}$ < 10 GeV/$c$ is presented. These momenta are much lower than previous measurements at the LHC. No significant difference between pp and p-Pb is observed, with PYTHIA 8.2 describing both data sets within uncertainties. This measurement constrains nuclear effects on the parton fragmentation in p-Pb collisions, and provides a benchmark for future studies of Pb-Pb collisions.

arXiv comment25 pages, 5 captioned figures, 2 tables, authors from page 20, published version, figures at http://alice-publications.web.cern.ch/node/6298

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• Exploring the substructure of nucleons and nuclei with machine learning