Konstantinidis, N;
ATLAS Collaboration, .;
(2019)
Measurement of angular and momentum distributions of charged particles within and around jets in Pb+Pb and pp collisions at \sqrt{(s)^NN} = 5.02 TeV with the ATLAS detector.
Physical Review C
, 100
, Article 064901. 10.1103/PhysRevC.100.064901.
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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)^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- 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 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.
| Type: | Article |
|---|---|
| Title: | Measurement of angular and momentum distributions of charged particles within and around jets in Pb+Pb and pp collisions at \sqrt{(s)^NN} = 5.02 TeV with the ATLAS detector |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1103/PhysRevC.100.064901 |
| Publisher version: | https://doi.org/10.1103/PhysRevC.100.064901 |
| Language: | English |
| Additional information: | © 2019 CERN, for the ATLAS Collaboration. Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license (https://creativecommons.org/licenses/by/4.0/). |
| Keywords: | Nuclear Physics, Relativistic heavy-ion collisions |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/10088208 |
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