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Production of ϒ(nS) mesons in Pb + Pb and pp collisions at 5.02 TeV
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Production of ϒ(nS) mesons in Pb + Pb and pp collisions at 5.02 TeV

G. Aad, B. Abbott, D.C. Abbott, K. Abeling, S.H. Abidi, A. Aboulhorma, H. Abramowicz, H. Abreu, Y. Abulaiti, A.C. Abusleme Hoffman, …
Physical Review C, 卷.107(5), e054912
05/2023
DOI: https://doi.org/10.1103/PhysRevC.107.054912

摘要

Nuclear and High Energy Physics
A measurement of the production of vector bottomonium states, ϒ(1S), ϒ(2S), and ϒ(3S), in Pb + Pb and pp collisions at a center-of-mass energy per nucleon pair of 5.02 TeV is presented. The data correspond to integrated luminosities of 1.38 nb <sup>-1</sup> of Pb + Pb data collected in 2018, 0.44 nb <sup>-1</sup> of Pb + Pb data collected in 2015, and 0.26 fb <sup>-1</sup> of pp data collected in 2017 by the ATLAS detector at the Large Hadron Collider. The measurements are performed in the dimuon decay channel for transverse momentum p <sup>μμ</sup> <sub>T</sub> < 30 GeV, absolute rapidity |y <sup>μμ</sup> | < 1.5, and Pb + Pb event centrality 0-80%. The production rates of the three bottomonium states in Pb + Pb collisions are compared with those in pp collisions to extract the nuclear modification factors as functions of event centrality, p <sup>μμ</sup> <sub>T</sub> , and |y <sup>μμ</sup> |. In addition, the suppression of the excited states relative to the ground state is studied. The results are compared with theoretical model calculations.

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