Journal Article

Measurement of prompt and nonprompt charmonium suppression in PbPb collisions at 5.02 TeV

West, C, Pape, L, Sulak, L, Hirosky, R, Mitra, S, S Sanchez Cruz, Mestvirishvili, A, Gilbert, A, Pooth, O, Merlin, J A, Santoro, A, Harper, S, Wyslouch, B, Andrea, J, Trocsanyi, Z L, Chudasama, R, Leloup, C, Pozzobon, N, Benussi, L, Naimuddin, M, Lowette, S, Gerosa, R, Vernieri, C, Weiler, T, Ingram, Q, Katsoulis, P, Mcbrayer, W, Petkov, P, Onel, Y, Zenaiev, O, Caminada, L, Vidal, R, A Vilela Pereira, Cossutti, F, Thiel, M, C Mora Herrera, J Suarez Gonzalez, Snyder, C, Rorie, J, Schnetzer, S, Ruggles, T, Frueboes, T, A Lopez Virto, Eusebi, R, D Del Re, Kinnunen, R, Ghezzi, A, Cavallo, N, Teroerde, M, Kuznetsova, E, Litov, L, Terentyev, N, Schmitz, E, Dasu, S, Shepherd-Themistocleous, C H, Tomalin, I R, Lee, J, Grab, C, Lee, K, Lee, H, J Piedra Gomez, Ershov, A, Auffray, E, Heintz, U, Hadjiiska, R, Lee, A, Baden, A, Zenoni, F, Kleinwort, C, Yoo, J, Colaleo, A, Lustermann, W, Cole, J E, Fay, J, Antonelli, L, Faccioli, P, Lee, S, Zorbilmez, C, Heidegger, C, Obertino, M M, Topsis-Giotis, I, Grunewald, M, Kuo, C M, Rodrigo, T, Paganini, P, Johnson, M, Dragicevic, M, Rinkevicius, A, E Belchior Batista Das Chagas, Ackert, A, Ruspa, M, Tos, K, D d’Enterria, Johnson, A, Dalchenk

2018

Overview

The nuclear modification factors of J/ψ and ψ(2S) mesons are measured in PbPb collisions at a centre-of-mass energy per nucleon pair of sNN=5.02TeV. The analysis is based on PbPb and pp data samples collected by CMS at the LHC in 2015, corresponding to integrated luminosities of 464μb-1 and 28pb-1, respectively. The measurements are performed in the dimuon rapidity range of |y|<2.4 as a function of centrality, rapidity, and transverse momentum (pT ) from pT=3GeV/c in the most forward region and up to 50GeV/c. Both prompt and nonprompt (coming from b hadron decays) J/ψ mesons are observed to be increasingly suppressed with centrality, with a magnitude similar to the one observed at sNN=2.76TeV for the two J/ψ meson components. No dependence on rapidity is observed for either prompt or nonprompt J/ψ mesons. An indication of a lower prompt J/ψ meson suppression at pT>25GeV/c is seen with respect to that observed at intermediate pT. The prompt ψ(2S) meson yield is found to be more suppressed than that of the prompt J/ψ mesons in the entire pT range.

• Publisher: Springer Nature B.V
• Subject: Collisions / Dependence / Large Hadron Collider / Mesons / Solenoids / Transverse momentum