Measurement of prompt and nonprompt charmonium suppression in $$\text {PbPb}$$ collisions at 5.02$$\,\text {Te}\text {V}

• Published in: The European physical journal. C, Particles and fields Vol. 78; no. 6
• Main Authors: Jeitler, M., Mikulec, I., De Visscher, S., Delcourt, M., Thiel, M., Li, Q., Sirois, Y., Gelé, D., Gadrat, S., El Mamouni, H., Feld, L., Kiesel, M. K., Klein, K., Erdweg, S., Pook, T., Kasemann, M., Mankel, R., Ntomari, E., Freund, B., Plagge, M., Geralis, T., Kesisoglou, S., Tsitsonis, D., Csanad, M., Ujvari, B., Bhattacharya, R., Mondal, K., Rane, A., Errico, F., Iaselli, G., Siroli, G. P., Chatterjee, K., Benato, L., Spagnolo, P., Longo, E., Migliore, E., Romero, A., Jo, Y., Oreshkin, V., Golubev, N., Philippov, D., Lokhtin, I., Quintario Olmeda, A., Lopez Virto, A., Pape, L., Tosi, M., Zeuner, W. D., Kotlinski, D., Rohe, T., Hits, D., Pata, J., Pinna, D., Rauco, G., Damarseckin, S., Demiroglu, Z. S., Gokbulut, G., Kangal, E. E., Topakli, H., Kreczko, L., Coughlan, J. A., Linacre, J., Lyons, L., Khan, A., Piperov, S., Band, R., Breedon, R., Smith, J., Ignatenko, M., Regnard, S., Valuev, V., Gary, J. W., Paneva, M. I., Yoo, J., Vlimant, J. R., Ryd, A., Grünendahl, S., Kreis, B., Lincoln, D., De Sá, R. Lopes, Rakness, G., Stoynev, S., Vaandering, E. W., Carver, M., Gleyzer, S. V., Baarmand, M. M., Apanasevich, L., Cavanaugh, R., Hofman, D. J., Ogul, H., Gritsan, A. V., Khalil, S., Ricci-Tam, F., Benvenuti, A. C., Evans, A., Golf, F., Lange, D., Jung, A. W., Mesropian, C., Volobouev, I., Ni, H.
• Format: Journal Article
• Language: English
• Published: United States Springer 01.06.2018
• Subjects: NUCLEAR PHYSICS AND RADIATION PHYSICS; PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
• ISSN: 1434-6044; 1434-6052
• DOI: 10.1140/epjc/s10052-018-5950-6

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