Azimuthal anisotropies of charged particles with high transverse momentum in Pb+Pb collisions at √𝒔NN = 5.02 TeV with the ATLAS detector

ATLAS Collaboration; G Aad; E Aakvaag; B Abbott; S Abdelhameed; K Abeling; Usha Mallik

doi:10.48550/arXiv.2412.15658

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Azimuthal anisotropies of charged particles with high transverse momentum in Pb+Pb collisions at √𝒔NN = 5.02 TeV with the ATLAS detector

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Azimuthal anisotropies of charged particles with high transverse momentum in Pb+Pb collisions at √𝒔NN = 5.02 TeV with the ATLAS detector

ATLAS Collaboration, G Aad, E Aakvaag, B Abbott, S Abdelhameed, K Abeling and Usha Mallik

ArXiV.org

Cornell University

12/20/2024

DOI: 10.48550/arXiv.2412.15658

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https://doi.org/10.48550/arXiv.2412.15658View

Preprint (Author's original) This preprint has not been evaluated by subject experts through peer review. Preprints may undergo extensive changes and/or become peer-reviewed journal articles. Open Access

Abstract

A measurement is presented of elliptic (𝑣2) and triangular (𝑣3) azimuthal anisotropy coefficients for charged particles produced in Pb+Pb collisions at √𝑠NN = 5.02 TeV using a dataset corresponding to an integrated luminosity of 0.44 nb−1 collected with the ATLAS detector at the LHC in 2018. The values of 𝑣2 and 𝑣3 are measured for charged particles over a wide range of transverse momentum (𝑝T), 1–400 GeV, and Pb+Pb collision centrality, 0–60%, using the scalar product and multi-particle cumulant methods. These methods are sensitive to event-by-event fluctuations and non-flow effects in the measurements of azimuthal anisotropies. Positive values of 𝑣2 are observed up to a 𝑝T of approximately 100 GeV from both methods across all centrality intervals. Positive values of 𝑣3 are observed up to approximately 25 GeV using both methods, though the application of the three-subevent technique to the multi-particle cumulant method leads to significant changes at the highest 𝑝T. At high 𝑝T (𝑝T ⪆ 10 GeV), charged particles are dominantly from jet fragmentation. These jets, and hence the measurements presented here, are sensitive to the path-length dependence of parton energy loss in the quark-gluon plasma produced in Pb+Pb collisions.

Details

Title: Subtitle: Azimuthal anisotropies of charged particles with high transverse momentum in Pb+Pb collisions at √𝒔NN = 5.02 TeV with the ATLAS detector
Creators: ATLAS Collaboration
G Aad (Contributor) - Aix-Marseille Université
E Aakvaag (Contributor)
B Abbott (Contributor)
S Abdelhameed (Contributor)
K Abeling (Contributor)
Usha Mallik (Contributor)
Resource Type: Preprint
Publication Details: ArXiV.org
DOI: 10.48550/arXiv.2412.15658
ISSN: 2331-8422
Publisher: Cornell University; Ithaca, New York
Language: English
Date posted: 12/20/2024
Date updated: 02/24/2025
Academic Unit: Physics and Astronomy
Record Identifier: 9984825635502771

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