Now showing 1 - 2 of 2
  • Publication
    Measurement of the Centrality Dependence of the Dijet Yield in Formula Presented Collisions at Formula Presented with the ATLAS Detector
    (2024-03-08)
    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.
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    Lindon, J. H.
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    Nishu, N.
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    Pinfold, J. L.
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    Cakir, O.
    ;
    Yildiz, H. Duran
    ;
    Kuday, S.
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    Turk Cakir, I.
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    Sultansoy, S.
    ;
    Adam Bourdarios, C.
    ;
    Arnaez, O.
    ;
    Berger, N.
    ;
    Castillo, F. L.
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    Costanza, F.
    ;
    Delmastro, M.
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    Di Ciaccio, L.
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    Hryn’ova, T.
    ;
    Jézéquel, S.
    ;
    Koletsou, I.
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    Levêque, J.
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    Lewis, D. J.
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    Little, J. D.
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    Lorenzo Martinez, N.
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    Poddar, G.
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    Sanchez Pineda, A.
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    Sauvan, E.
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    Bernardi, G.
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    Bomben, M.
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    Li, A.
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    Li, T.
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    Marchiori, G.
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    Nakkalil, K.
    ;
    Shen, Q.
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    Zhang, Y.
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    Chekanov, S.
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    Darmora, S.
    ;
    Hopkins, W. H.
    ;
    Hoya, J.
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    Love, J.
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    Luongo, N. A.
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    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.
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    Loch, P.
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    Rutherfoord, J. P.
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    Sardain, J.
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    Varnes, E. W.
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    Zhou, H.
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    Zhou, Y.
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    Bakshi Gupta, D.
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    Burghgrave, B.
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    Cardenas, J. C.J.
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    De, K.
    ;
    Farbin, A.
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    Hadavand, H. K.
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    Myers, A. J.
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    Ozturk, N.
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    Usai, G.
    ;
    White, A.
    ;
    Angelidakis, S.
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    Fassouliotis, D.
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    Fountas, L.
    ;
    Gkialas, I.
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    Kourkoumelis, C.
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    Alexopoulos, T.
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    Drivas-Koulouris, I.
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    Gazis, E. N.
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    Kitsaki, C.
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    Maltezos, S.
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    Paraskevopoulos, C.
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    Perganti, M.
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    ; ; ;
    Fernandez Luengo, S.I.
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    Fuenzalida Garrido, S.
    ;
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    Robles Gajardo, C.M.
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    Viaux Maira, N.
    ATLAS measured the centrality dependence of the dijet yield using 165  nb−1 of 𝑝+Pb data collected at √𝑠NN=8.16  TeV in 2016. The event centrality, which reflects the 𝑝+Pb impact parameter, is characterized by the total transverse energy registered in the Pb-going side of the forward calorimeter. The central-to-peripheral ratio of the scaled dijet yields, 𝑅CP, is evaluated, and the results are presented as a function of variables that reflect the kinematics of the initial hard parton scattering process. The 𝑅CP shows a scaling with the Bjorken 𝑥 of the parton originating from the proton, 𝑥𝑝, while no such trend is observed as a function of 𝑥Pb. This analysis provides unique input to understanding the role of small proton spatial configurations in 𝑝+Pb collisions by covering parton momentum fractions from the valence region down to 𝑥𝑝∼10−3 and 𝑥Pb∼4×10−4.
    Scopus© Citations 1
  • Publication
    Azimuthal Angle Correlations of Muons Produced via Heavy-Flavor Decays in 5.02 TeV Pb+Pb and pp Collisions with the ATLAS Detector
    (2024-05-17)
    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.
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    Panchal, D. K.
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    Tost, M.
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    Unal, M.
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    Huseynov, N.
    ;
    ; ; ;
    Fernandez Luengo, S.I.
    ;
    Fuenzalida Garrido, S.
    ;
    ;
    Carolina Robles Gajardo
    ;
    Tapia Araya, S.
    ;
    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 𝑝⁢𝑝 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 Δ⁢𝜙 for muon pairs having pseudorapidity separation |Δ⁢𝜂|>0.8, are measured in different Pb+Pb centrality intervals and compared to the same distribution measured in 𝑝⁢𝑝 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 Δ⁢𝜙 distributions at Δ⁢𝜙∼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 Δ⁢𝜙 distributions, are found to not vary significantly as a function of Pb+Pb collision centrality and are similar for 𝑝⁢𝑝 and Pb+Pb collisions. This observation will provide important constraints on theoretical descriptions of heavy-quark interactions with the quark-gluon plasma.