Measurement of angular and momentum distributions of charged particles within and around jets in Pb plus Pb and <i>pp</i> collisions at √s<sub>NN</sub>=5.02 TeV with ATLAS at the LHC



Puri, Akshat, Aaboud, M, Aad, G, Abbott, B, Abdinov, O, Abeloos, B, Abhayasinghe, DK, Abidi, SH, AbouZeid, OS, Abraham, NL
et al (show 2924 more authors) (2019) Measurement of angular and momentum distributions of charged particles within and around jets in Pb plus Pb and <i>pp</i> collisions at √s<sub>NN</sub>=5.02 TeV with ATLAS at the LHC. NUCLEAR PHYSICS A, 982 (6). pp. 177-179.

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Abstract

Studies of the fragmentation of jets into charged particles in heavy-ion collisions can provide information about the mechanism of jet-quenching by the hot and dense QCD matter created in such collisions, the quark-gluon plasma. This paper presents a measurement of the angular distribution of charged particles around the jet axis in $\sqrt{s_{\mathrm{NN}}}=$ 5.02 TeV Pb+Pb and $pp$ collisions, using the ATLAS detector at the LHC. The Pb+Pb and $pp$ data sets have integrated luminosities of 0.49 nb$^{-1}$ and 25 pb$^{-1}$, respectively. The measurement is performed for jets reconstructed with the anti-$k_{t}$ algorithm with radius parameter $R = 0.4$ and is extended to an angular distance of $r= 0.8$ from the jet axis. Results are presented as a function of Pb+Pb collision centrality and distance from the jet axis for charged particles with transverse momenta in the 1$-$63 GeV range, matched to jets with transverse momenta in the 126$-$316 GeV range and an absolute value of jet rapidity of less than 1.7. Modifications to the measured distributions are quantified by taking a ratio to the measurements in $pp$ collisions. Yields of charged particles with transverse momenta below 4 GeV are observed to be increasingly enhanced as a function of angular distance from the jet axis, reaching a maximum at $r=0.6$. Charged particles with transverse momenta above 4 GeV have an enhanced yield in Pb+Pb collisions in the jet core for angular distances up to $r = 0.05$ from the jet axis, with a suppression at larger distances.

Item Type: Article
Additional Information: 44 pages in total, author list starting page 28, 11 figures and no table, submitted to PRC. All figures including auxiliary material figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HION-2018-03/
Uncontrolled Keywords: jets, fragmentation functions, jet shapes
Depositing User: Symplectic Admin
Date Deposited: 27 Feb 2019 16:23
Last Modified: 17 Mar 2024 03:12
DOI: 10.1016/j.nuclphysa.2018.09.021
Open Access URL: https://doi.org/10.1016/j.nuclphysa.2018.09.021
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URI: https://livrepository.liverpool.ac.uk/id/eprint/3033526