A measurement of the production of vector bottomonium states, Υ(1S), Y(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^{−1} of Pb+Pb data collected in 2018, 0.44 nb^{−1} of Pb+Pb data collected in 2015, and 0.26 fb^{−1} 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^{μμ}_T<30 GeV, absolute rapidity |y^{μμ}|<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^{μμ}_T, and |y^{μμ}|. In addition, the suppression of the excited states relative to the ground state is studied. The results are compared with theoretical model calculations.
Production of Υ(nS) mesons in Pb+Pb and pp collisions at 5.02 TeV / Anulli, F.; Artoni, G.; Bagnaia, P.; Bauce, M.; Bini, C.; Bruscino, N.; Carnesale, M.; Chomont, A. R.; Corradi, M.; De Salvo, A.; Di Bello, F. A.; Di Domenico, A.; Falciano, S.; Gauzzi, P.; Gentile, S.; Giagu, S.; Ippolito, V.; Kado, M.; Lacava, F.; Longarini, I.; Luci, C.; Martinelli, L.; Morodei, F.; Nisati, A.; Padovano, G.; Pasqualucci, E.; Rosati, S.; Sabetta, L.; Safai Tehrani, F.; Santi, L.; Vari, R.; Veneziano, S.. - In: PHYSICAL REVIEW C. - ISSN 2469-9985. - 107:5(2023). [10.1103/PhysRevC.107.054912]
Production of Υ(nS) mesons in Pb+Pb and pp collisions at 5.02 TeV
G. Artoni;P. Bagnaia;M. Bauce;C. Bini;M. Carnesale;A. R. Chomont;A. De Salvo;F. A. Di Bello;A. Di Domenico;S. Falciano;P. Gauzzi;S. Gentile;S. Giagu;V. Ippolito;M. Kado;F. Lacava;I. Longarini;C. Luci;L. Martinelli;F. Morodei;G. Padovano;L. Sabetta;F. Safai Tehrani;L. Santi;
2023
Abstract
A measurement of the production of vector bottomonium states, Υ(1S), Y(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^{−1} of Pb+Pb data collected in 2018, 0.44 nb^{−1} of Pb+Pb data collected in 2015, and 0.26 fb^{−1} 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^{μμ}_T<30 GeV, absolute rapidity |y^{μμ}|<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^{μμ}_T, and |y^{μμ}|. In addition, the suppression of the excited states relative to the ground state is studied. The results are compared with theoretical model calculations.File | Dimensione | Formato | |
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