Measurement of angular and momentum distributions of charged particles within and around jets in $\mathrm{Pb}+\mathrm{Pb}$ and $pp$ collisions at $\sqrt{{s}_{NN}}=5.02$ TeV with the ATLAS detector

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Measurement of angular and momentum distributions of charged particles within and around jets in $Pb + Pb$ and $p p$ collisions at $\sqrt{s_{N N}} = 5.02$ TeV with the ATLAS detector

G. Aad et al. (ATLAS Collaboration)

Phys. Rev. C 100, 064901 – Published 2 December 2019; Erratum Phys. Rev. C 101, 059903 (2020)

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 $\sqrt{s_{N N}} = 5.02$ TeV $Pb + Pb$ and pp collisions, using the ATLAS detector at the LHC. The $Pb + Pb$ and $p p$ 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- to 63-GeV range, matched to jets with transverse momenta in the 126- to 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 $p p$ 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.

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Received 17 August 2019

DOI:https://doi.org/10.1103/PhysRevC.100.064901

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

Physics Subject Headings (PhySH)

Fragmentation into hadrons Jets & heavy flavor physics Relativistic heavy-ion collisions

Nuclear Physics

Erratum

Erratum: Measurement of angular and momentum distributions of charged particles within and around jets in $Pb + Pb$ and $p p$ collisions at $\sqrt{s_{N N}} = 5.02 TeV$ with the ATLAS detector [Phys. Rev. C 100, 064901 (2019)]

G. Aad et al. and ATLAS Collaboration

Phys. Rev. C 101, 059903 (2020)

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Vol. 100, Iss. 6 — December 2019

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Physical Review C

covering nuclear physics

Measurement of angular and momentum distributions of charged particles within and around jets in $Pb + Pb$ and $p p$ collisions at $\sqrt{s_{N N}} = 5.02$ TeV with the ATLAS detector

G. Aad et al. (ATLAS Collaboration)

Phys. Rev. C 100, 064901 – Published 2 December 2019; Erratum Phys. Rev. C 101, 059903 (2020)

Abstract

Physics Subject Headings (PhySH)

Erratum

Erratum: Measurement of angular and momentum distributions of charged particles within and around jets in $Pb + Pb$ and $p p$ collisions at $\sqrt{s_{N N}} = 5.02 TeV$ with the ATLAS detector [Phys. Rev. C 100, 064901 (2019)]

G. Aad et al. and ATLAS Collaboration

Phys. Rev. C 101, 059903 (2020)

Authors & Affiliations

Article Text

References

Issue

Physical Review C

covering nuclear physics

Measurement of angular and momentum distributions of charged particles within and around jets in Pb+Pb and pp collisions at sNN=5.02 TeV with the ATLAS detector

G. Aad et al. (ATLAS Collaboration)

Phys. Rev. C 100, 064901 – Published 2 December 2019; Erratum Phys. Rev. C 101, 059903 (2020)

Abstract

Physics Subject Headings (PhySH)

Erratum

Erratum: Measurement of angular and momentum distributions of charged particles within and around jets in Pb+Pb and pp collisions at sNN=5.02TeV with the ATLAS detector [Phys. Rev. C 100, 064901 (2019)]

G. Aad et al. and ATLAS Collaboration

Phys. Rev. C 101, 059903 (2020)

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Article Text

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Measurement of angular and momentum distributions of charged particles within and around jets in $Pb + Pb$ and $p p$ collisions at $\sqrt{s_{N N}} = 5.02$ TeV with the ATLAS detector

Erratum: Measurement of angular and momentum distributions of charged particles within and around jets in $Pb + Pb$ and $p p$ collisions at $\sqrt{s_{N N}} = 5.02 TeV$ with the ATLAS detector [Phys. Rev. C 100, 064901 (2019)]