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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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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 0.44nb−1 collected with the ATLAS detector at the LHC in 2018. The values...

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Main Authors: Aad, Georges (Author) , Ackermann, Anke (Author) , Backes, Mathias (Author) , Baltes, Lisa Marie (Author) , Bartels, Falk (Author) , Dittmeier, Sebastian (Author) , Dunford, Monica (Author) , Franchino, Silvia (Author) , Junkermann, Thomas (Author) , Mkrtchyan, Tigran (Author) , Rassloff, Damir Fabrice (Author) , Sanfilippo, Lorenzo (Author) , Schöning, André (Author) , Schultz-Coulon, Hans-Christian (Author) , Sothilingam, Varsiha (Author) , Stamen, Rainer (Author) , Vigani, Luigi (Author) , Wessels, Martin (Author) , Zinßer, Joachim (Author)
Corporate Author: ATLAS Collaboration (Author)
Format: Article (Journal)
Language:English
Published: 27 August 2025
In: Physical review
Year: 2025, Volume: 112, Issue: 2, Pages: 1-34
ISSN:2469-9993
DOI:10.1103/d46f-yl4n
Online Access:Verlag, kostenfrei, Volltext: https://doi.org/10.1103/d46f-yl4n
Verlag, kostenfrei, Volltext: https://link.aps.org/doi/10.1103/d46f-yl4n
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Author Notes:G. Aad et al. (ATLAS Collaboration)*
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Summary: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 0.44nb−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 multiparticle cumulant methods. These methods are sensitive to event-by-event fluctuations and nonflow 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 multiparticle 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.
Item Description:Veröffentlicht: 27. August 2025
*ATLAS Collaboration: G. Aad, A. Ackermann, M.J. Backes, L.M. Baltes, F. Bartels, S.J. Dittmeier, M. Dunford, S. Franchino, T. Junkermann, T. Mkrtchyan, D.F. Rassloff, L. Sanfilippo, A. Schoening, H.-C. Schultz-Coulon, V. Sothilingam, R. Stamen, L. Vigani, M. Wessels, J. Zinsser [und 2872 weitere Personen]
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Im Titel steht der Ausdruck "sNN" unter dem Wurzelsymbol
Physical Description:Online Resource
ISSN:2469-9993
DOI:10.1103/d46f-yl4n

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