Comparison of inclusive and photon-tagged jet suppression in 5.02 TeV Pb+Pb collisions with ATLAS
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The ATLAS collaboration (2023). Comparison of inclusive and photon-tagged jet suppression in 5.02 TeV Pb+Pb collisions with ATLAS. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 846, Article 138154. [https://doi.org/10.1016/j.physletb.2023.138154]
PatrocinadorEU-ESF; GenT Programmes Generalitat Valenciana , Spain; La Caixa Banking Foundation; PROMETEO; H2020 Marie Skłodowska-Curie Actions MSCA; CERN; European Research Council ERC; European Cooperation in Science and Technology COST; Generalitat de Catalunya; Agencia Nacional de Promoción Científica y Tecnológica ANPCyT; Ministerio de Ciencia e Innovación MICINN; Horizon 2020; European Regional Development Fund ERDF; Agencia Nacional de Investigación y Desarrollo ANID; PIC (Spain)
Parton energy loss in the quark–gluon plasma (QGP) is studied with a measurement of photon-tagged jet production in 1.7 nb−1 of Pb+Pb data and 260 pb−1 of pp data, both at sNN=5.02 TeV, with the ATLAS detector. The process pp →γ+jet+X and its analogue in Pb+Pb collisions is measured in events containing an isolated photon with transverse momentum (pT) above 50 GeV and reported as a function of jet pT. This selection results in a sample of jets with a steeply falling pT distribution that are mostly initiated by the showering of quarks. The pp and Pb+Pb measurements are used to report the nuclear modification factor, RAA, and the fractional energy loss, Sloss, for photon-tagged jets. In addition, the results are compared with the analogous ones for inclusive jets, which have a significantly smaller quark-initiated fraction. The RAA and Sloss values are found to be significantly different between those for photon-tagged jets and inclusive jets, demonstrating that energy loss in the QGP is sensitive to the colour-charge of the initiating parton. The results are also compared with a variety of theoretical models of colour-charge-dependent energy loss.