Butterworth, Jonathan;
ATLAS Collaboration;
(2023)
Measurement of Suppression of Large-Radius Jets and Its Dependence on Substructure in
Pb
+
Pb
Collisions at
√
s
N
N
=
5.02
TeV
with the ATLAS Detector.
Physical Review Letters
, 131
, Article 172301. 10.1103/PhysRevLett.131.172301.
Preview |
Text
PhysRevLett.131.172301.pdf - Published Version Download (49MB) | Preview |
Abstract
This letter presents a measurement of the nuclear modification factor of large-radius jets in ffiffiffiffiffiffiffiffi sNN p ¼ 5.02 TeV Pb þ Pb collisions by the ATLAS experiment. The measurement is performed using 1.72 nb−1 and 257 pb−1 of Pb þ Pb and pp data, respectively. The large-radius jets are reconstructed with the anti-kt algorithm using a radius parameter of R ¼ 1.0, by reclustering anti-kt R ¼ 0.2 jets, and are measured over the transverse momentum (pT) kinematic range of 158 < pT < 1000 GeV and absolute pseudorapidity jyj < 2.0. The large-radius jet constituents are further reclustered using the kt algorithm in order to obtain the splitting parameters, ffiffiffiffiffiffi d12 p and ΔR12, which characterize the transverse momentum scale and angular separation for the hardest splitting in the jet, respectively. The nuclear modification factor, RAA, obtained by comparing the Pb þ Pb jet yields to those in pp collisions, is measured as a function of jet transverse momentum (pT ) and ffiffiffiffiffiffi d12 p or ΔR12. A significant difference in the quenching of large-radius jets having single subjet and those with more complex substructure is observed. Systematic comparison of jet suppression in terms of RAA for different jet definitions is also provided. Presented results support the hypothesis that jets with hard internal splittings lose more energy through quenching and provide a new perspective for understanding the role of jet structure in jet suppression.
| Type: | Article |
|---|---|
| Title: | Measurement of Suppression of Large-Radius Jets and Its Dependence on Substructure in Pb + Pb Collisions at √ s N N = 5.02 TeV with the ATLAS Detector |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1103/PhysRevLett.131.172301 |
| Publisher version: | https://doi.org/10.1103/PhysRevLett.131.172301 |
| Language: | English |
| Additional information: | 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. |
| 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/10180297 |
Archive Staff Only
 |
View Item |
