Measurement of ψ(2S) to J/ψ cross-section ratio as function of multiplicity in pPb collisions at √s_NN=8.16 TeV

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Aaij, R, Abdelmotteleb, ASW, Beteta, C Abellan, Abudinen, F, Ackernley, T, Adefisoye, AA, Adeva, B, Adinolfi, M, Adlarson, P, Agapopoulou, C et al (show 1134 more authors) , Aidala, CA, Ajaltouni, Z, Akar, S, Akiba, K, Albicocco, P, Albrecht, J, Alessio, F, Aliouche, Z, Cartelle, P Alvarez, Amalric, R, Amato, S, An, L, Anderlini, L, Andreola, P, Andreotti, M, Anelli, A, Ao, D, Archilli, F, Areg, Z, Argenton, M, Arguedas Cuendis, S, Artamonov, A, Artuso, M, Aslanides, E, Da Silva, R Ataide, Atzeni, M, Audurier, B, Authier, JA, Bacher, D, Perea, I Bachiller, Bachmann, S, Bachmayer, M, Back, JJ, Baladron Rodriguez, P, Balagura, V, Balboni, A, Baldini, W, Balzani, L, Bao, H, Leite, J Baptista de Souza, Barbero Pretel, C, Barbetti, M, Barbosa, IR, Barlow, RJ, Barnyakov, M, Barsuk, S, Barter, W, Bartz, J, Bashir, S, Batsukh, B, Battista, PB, Bay, A, Beck, A, Becker, M, Bedeschi, F, Bediaga, IB, Behling, NA, Belin, S, Belous, K, Belov, I, Belyaev, I, Benane, G, Bencivenni, G, Ben-Haim, E, 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Golobardes, E, Golubkov, D, Golutvin, A, Gomez Fernandez, S, Gomulka, W, Goncales Vaz, I, Abrantes, F Goncalves, Goncerz, M, Gong, G, Gooding, JA, Gorelov, IV, Gotti, C, Govorkova, E, Grabowski, JP, Cardoso, LA Granado, Grauges, E, Graverini, E, Grazette, L, Graziani, G, Grecu, AT, Greeven, LM, Grieser, NA, Grillo, L, Gromov, S, Gu, C, Guarise, M, Guerry, L, Guliaeva, V, Guenther, PA, Guseinov, A-K, Gushchin, E, Guz, Y, Gys, T, Habermann, K, Hadavizadeh, T, Hadjivasiliou, C, Haefeli, G, Haen, C, Hallett, G, Hamilton, PM, Hammerich, J, Han, Q, Han, X, Hansmann-Menzemer, S, Hao, L, Harnew, N, Harris, TH, Hartmann, M, Hashmi, S, He, J, Hemmer, F, Henderson, C, Henderson, R, Henderson, RDL, Hennequin, AM, Hennessy, K ORCID: 0000-0002-1529-8087, Henry, L, Herd, J, Gascon, P Herrero, Heuel, J, Hicheur, A, Mendizabal, G Hijano, Horswill, J, Hou, R, Hou, Y, Howarth, N, Hu, J, Hu, W, Hu, X, Hulsbergen, W, Hunter, RJ, Hushchyn, M, Hutchcroft, D ORCID: 0000-0002-4174-6509, Idzik, M, Ilin, D, Ilten, P, Iniukhin, A, Ishteev, A, Ivshin, K, Jage, H, Jaimes Elles, SJ, Jakobsen, S, Jans, E, Jashal, BK, Jawahery, A, Jayaweera, C, Jevtic, V, Jiang, E, Jiang, X, Jiang, Y, Jiang, YJ, John, M, Rajan, A John Rubesh, Johnson, D, Jones, CR, Jones, TP, Joshi, S, Jost, B, Castella, J Juan, Jurik, N, Juszczak, I, Kaminaris, D, Kandybei, S, Kane, M, Kang, Y, Kar, C, Karacson, M, Karpenkov, D, Kauniskangas, A, Kautz, JW, Kazanecki, MK, Keizer, F, Kenzie, M, Ketel, T, Khanji, B, Kharisova, A, Kholodenko, S, Khreich, G, Kirn, T, Kirsebom, VS, Kitouni, O, Klaver, S, Kleijne, N, Klimaszewski, K, Kmiec, MR, Koliiev, S, Kolk, L, Konoplyannikov, A, Kopciewicz, P, Koppenburg, P, Korchin, A, Korolev, M, Kostiuk, I, Kot, O, Kotriakhova, S, Kowalczyk, E, Kozachuk, A, Kravchenko, P, Kravchuk, L, Kreps, M, Krokovny, P, Krupa, W, Krzemien, W, Kshyvanskyi, O, Kubis, S, Kucharczyk, M, Kudryavtsev, V, Kulikova, E, Kupsc, A, Kushnir, V, Kutsenko, B, Kyryllin, I, Lacarrere, D, Laguarta Gonzalez, P, Lai, A, 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Munoz-Rojas, F, Murta, R, Mytrochenko, V, Naik, P ORCID: 0000-0001-6977-2971, Nakada, T, Nandakumar, R, Nanut, T, Nasteva, I, Needham, M, Nekrasova, E, Neri, N, Neubert, S, Neufeld, N, Neustroev, P, Nicolini, J, Nicotra, D, Niel, EM, Nikitin, N, Niu, Q, Nogarolli, P, Nogga, P, Normand, C, Novoa Fernandez, J, Nowak, G, Nunez, C, Nur, HN, Oblakowska-Mucha, A, Obraztsov, V, Oeser, T, Okhotnikov, A, Okhrimenko, O, Oldeman, R, Oliva, F, Olivart Pino, E, Olocco, M, Onderwater, CJG, O'Neil, RH, Osthues, D, Otalora Goicochea, JM, Owen, P, Oyanguren, A, Ozcelik, O, Paciolla, F, Padee, A, Padeken, KO, Pagare, B, Pajero, T, Palano, A, Palutan, M, Pan, C, Pan, X, Panebianco, S, Panshin, G, Paolucci, L, Papanestis, A, Pappagallo, M, Pappalardo, LL, Pappenheimer, C, Parkes, C, Parmar, D, Passalacqua, B, Passaleva, G, Passaro, D, Pastore, A, Patel, M, Patoc, J, Patrignani, C, Paul, A, Pawley, CJ, Pellegrino, A, Peng, J, Peng, X, Altarelli, M Pepe, Perazzini, S, Pereima, D, Da Costa, H Pereira, 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Sheng, S, Shevchenko, V, Shi, B, Shi, Q, Shi, WS, Shimizu, Y, Shmanin, E, Shorkin, R, Shupperd, JD, Coutinho, R Silva, Simi, G, Simone, S, Singha, M, Skidmore, N, Skwarnicki, T, Slater, MW, Smith, E, Smith, K, Smith, M, Lavra, L Soares, Sokoloff, MD, Soler, FJP, Solomin, A, Solovev, A, Sommerfeld, NS, Song, R, Song, Y, Song, YS, De Almeida, FL Souza, Souza De Paula, B, Norella, E Spadaro, Spedicato, E, Speer, JG, Spiridenkov, E, Spradlin, P, Sriskaran, V, Stagni, F, Stahl, M, Stahl, S, Stanislaus, S, Stefaniak, M, Stein, EN, Steinkamp, O, Stevens, H, Strekalina, D, Su, Y, Suljik, F, Sun, J, Sun, L, Sundfeld, D, Sutcliffe, W, Swientek, K, Swystun, F, Szabelski, A, Szumlak, T, Tan, Y, Tang, Y, Tang, YT, Tat, MD, Terentev, A, Terzuoli, F, Teubert, F, Thoma, U, Thomas, E, Thompson, DJD, Thomson-Strong, AR, Tilquin, H, Tisserand, V, T'Jampens, S, Tobin, M, Tomassetti, L, Tonani, G, Tong, X, Tork, T, Torres Machado, D, Toscano, L, Tou, DY, Trippl, C, Tuci, G, Tuning, N, Uecker, LH, Ukleja, 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Wilson, FF, Winn, M, Wislicki, W, Witek, M, Witola, L, Wolf, TW, Wormser, G, Wotton, SA, Wu, H, Wu, J, Wu, X, Wu, Y, Wu, Z, Wyllie, K, Xian, S, Xiang, Z, Xie, Y, Xing, TX, Xu, A, Xu, L, Xu, M, Xu, Z, Yang, K, Yang, X, Yang, Y, Yang, Z, Yeroshenko, V, Yeung, H, Yin, H, Yin, X, Yu, CY, Yu, J, Yuan, X, Yuan, Y, Zaffaroni, E, Zavertyaev, M, Zdybal, M, Zenesini, F, Zeng, C, Zeng, M, Zhang, C, Zhang, D, Zhang, J, Zhang, L, Zhang, R, Zhang, S, Zhang, Y, Zhang, YZ, Zhang, Z, Zhao, Y, Zhelezov, A, Zheng, SZ, Zheng, XZ, Zheng, Y, Zhou, T, Zhou, X, Zhou, Y, Zhovkovska, V, Zhu, LZ, Zhu, X, Zhu, Y, Zhukov, V, Zhuo, J, Zou, Q, Zuliani, D, Zunica, G, Amey, JL, Amhis, Y and Andersson, M (2025) Measurement of ψ(2S) to J/ψ cross-section ratio as function of multiplicity in pPb collisions at √s_NN=8.16 TeV JOURNAL OF HIGH ENERGY PHYSICS, 2025 (11). 169-. ISSN 1126-6708, 1029-8479

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Abstract

The production ratio of ψ(2S) to J/ψ charmonium states is presented as a function of multiplicity in proton-lead collisions at a centre-of-mass energy of sNN=8.16 TeV, for both prompt and nonprompt sources. The total luminosity recorded by the LHCb experiment corresponds to 13.6 nb⁻¹ for pPb collisions and 20.8 nb⁻¹ for Pbp collisions, where the first particle corresponds to the particle traveling towards the detector. Measurements are performed in the dimuon final state at forward (backward) centre-of-mass rapidity, with respect to the proton direction, 1.5 < y^*< 4.0 (−5.0 < y^*< −2.5) for pPb (Pbp) collisions. A multiplicity dependence of the prompt production ratio is observed in pPb collisions, whereas no dependence is found in nonprompt production, nor in either prompt or nonprompt production in Pbp collisions. These results suggest that in the Pb-going direction additional suppression mechanisms beyond comover effects may be present, possibly related to the formation of quark-gluon plasma. This highlights a transition from small to large collision systems and provides important insight into the suppression of charmonia in proton-nucleus collisions.

Item Type:	Article
Uncontrolled Keywords:	Heavy Ion Experiments, Heavy-Ion Collision, Quarkonium
Divisions:	Faculty of Science & Engineering Faculty of Science & Engineering > School of Engineering Faculty of Science & Engineering > School of Physical Sciences Faculty of Science & Engineering > School of Physical Sciences > Physics Faculty of Science & Engineering > School of Engineering > Civil and Environmental Engineering
Depositing User:	Symplectic Admin
Date Deposited:	08 Dec 2025 16:23
Last Modified:	16 Jun 2026 07:13
DOI:	10.1007/JHEP11(2025)169
Open Access URL:	https://link.springer.com/content/pdf/10.1007/JHEP...
Related Websites:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3195982
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