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Azimuthal Angle Correlations of Muons Produced via Heavy-Flavor Decays in 5.02 TeV Pb+Pb and pp Collisions with the ATLAS Detector
Journal
Physical Review Letters
Date Issued
2024-05-17
Author(s)
Filmer, E. K.
Grant, C. M.
Jackson, P.
Kong, A. X.Y.
Pandya, H. D.
Potti, H.
Ruggeri, T. A.
Ting, E. X.L.
White, M. J.
Gingrich, D. M.
Lindon, J. H.
Nishu, N.
Pinfold, J. L.
Cakir, O.
Yildiz, H. Duran
Kuday, S.
Turk Cakir, I.
Sultansoy, S.
Adam Bourdarios, C.
Arnaez, O.
Berger, N.
Castillo, F. L.
Costanza, F.
Delmastro, M.
Di Ciaccio, L.
Hryn’ova, T.
Jézéquel, S.
Koletsou, I.
Levêque, J.
Lewis, D. J.
Little, J. D.
Lorenzo Martinez, N.
Poddar, G.
Sanchez Pineda, A.
Sauvan, E.
Bernardi, G.
Bomben, M.
Li, A.
Li, T.
Marchiori, G.
Nakkalil, K.
Shen, Q.
Zhang, Y.
Chekanov, S.
Darmora, S.
Hopkins, W. H.
Hoya, J.
Love, J.
Luongo, N. A.
Metcalfe, J.
Mete, A. S.
Paramonov, A.
Proudfoot, J.
Van Gemmeren, P.
Wamorkar, T.
Wang, R.
Zhang, J.
Cheu, E.
Cui, Z.
Ghosh, A.
Johns, K. A.
Lampl, W.
Lindley, R. E.
Loch, P.
Rutherfoord, J. P.
Sardain, J.
Varnes, E. W.
Zhou, H.
Zhou, Y.
Bakshi Gupta, D.
Burghgrave, B.
Cardenas, J. C.J.
De, K.
Farbin, A.
Hadavand, H. K.
Myers, A. J.
Ozturk, N.
Usai, G.
White, A.
Angelidakis, S.
Fassouliotis, D.
Fountas, L.
Gkialas, I.
Kourkoumelis, C.
Alexopoulos, T.
Drivas-Koulouris, I.
Gazis, E. N.
Kitsaki, C.
Maltezos, S.
Paraskevopoulos, C.
Perganti, M.
Tzanis, P.
Andeen, T.
Burton, C. D.
Choi, K.
Onyisi, P. U.E.
Panchal, D. K.
Tost, M.
Unal, M.
Huseynov, N.
Fernandez Luengo, S.I.
Fuenzalida Garrido, S.
Carolina Robles Gajardo
Tapia Araya, S.
Abstract
Angular correlations between heavy quarks provide a unique probe of the quark-gluon plasma created in ultrarelativistic heavy-ion collisions. Results are presented of a measurement of the azimuthal angle correlations between muons originating from semileptonic decays of heavy quarks produced in 5.02 TeV Pb+Pb and 𝑝𝑝 collisions at the LHC. The muons are measured with transverse momenta and pseudorapidities satisfying 𝑝𝜇T>4 GeV and |𝜂𝜇|<2.4, respectively. The distributions of azimuthal angle separation Δ𝜙 for muon pairs having pseudorapidity separation |Δ𝜂|>0.8, are measured in different Pb+Pb centrality intervals and compared to the same distribution measured in 𝑝𝑝 collisions at the same center-of-mass energy. Results are presented separately for muon pairs with opposite-sign charges, same-sign charges, and all pairs. A clear peak is observed in all Δ𝜙 distributions at Δ𝜙∼𝜋, consistent with the parent heavy-quark pairs being produced via hard-scattering processes. The widths of that peak, characterized using Cauchy-Lorentz fits to the Δ𝜙 distributions, are found to not vary significantly as a function of Pb+Pb collision centrality and are similar for 𝑝𝑝 and Pb+Pb collisions. This observation will provide important constraints on theoretical descriptions of heavy-quark interactions with the quark-gluon plasma.
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