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Al-Turany, M.; Alt, T.; Andrei, C.; Apadula, N.; Bailhache, R.; Bartsch, E.; Baruffaldi, F.; Bastid, N.; Bhasin, A.; Bianchi, N.; Biswas, S.; Bluhme, N.; Blume, C.; Bodova, T.; Boldizsár, L.; Borissov, A.; Bratrud, L.; Braun-Munzinger, P.; Bregant, M.; Buthelezi, Z.; Bylinkin, A.; Camacho, J. M. M.; Chakaberia, I.; Concas, M.; Conesa Balbastre, G.; Contreras, J. G.; Das, P.; Das, P.; Degenhardt, H. F.; Eikeland, V. N.; Fabbietti, L.; Feofilov, G.; Fokin, I.; Fuchs, U.; Galvan, C. D.; Garcia, J. R. A.; Giubellino, P.; Guo, W.; Hellbär, E.; Heybeck, B.; Horak, D.; Hosokawa, R.; Hristov, P.; Iddon, J. P.; Ilyas, H.; Ivanov, V.; Jacobs, P. M.; Kim, J.; Klemenz, T.; Konopka, P. J.; Koryciak, S. D.; Krüger, M.; Kvapil, J.; Lesser, E. D.; Liu, J.; Luparello, G.; Mager, M.; Martin, N. A.; Mazzaschi, F.; Mhlanga, S.; Nystrand, J.; Oppedisano, C.; Otwinowski, J.; Patra, R. N.; Paul, B.; Pisano, S.; Poghosyan, M. G.; Rath, R.; Redlich, K.; Rehman, A.; Rescakova, Z.; Rogochaya, E.; Rubini, N.; Rueda, O. V.; Rustamov, A.; Sadek, R.; Sadovsky, S.; Schmidt, N. V.; Schotter, R.; Selyuzhenkov, I.; Sevcenco, A.; Shabetai, A.; Shangaraev, A.; Sharma, A.; Sharma, H.; Sharma, N.; Sharma, U.; Singh, R.; Sitar, B.; Sitta, M.; Stan, I.; Suaide, A. A. P.; Swain, S.; Tveter, T. S.; Vala, M.; Vrláková, J.; Wilkinson, J.; Yang, S.; Zaviyalov, N.; Zhou, Y.
The journal of high energy physics, 06/2023, Letnik: 2023, Številka: 6Journal Article
A bstract Production of inclusive charmonia in pp collisions at center-of-mass energy of s = 13 TeV and p–Pb collisions at center-of-mass energy per nucleon pair of s NN = 8 . 16 TeV is studied as a function of charged-particle pseudorapidity density with ALICE. Ground and excited charmonium states ( J/ψ , ψ (2S)) are measured from their dimuon decays in the interval of rapidity in the center-of-mass frame 2 . 5 < y cms < 4 . 0 for pp collisions, and 2 . 03 < y cms < 3 . 53 and −4 . 46 < y cms < −2 . 96 for p–Pb collisions. The charged-particle pseudorapidity density is measured around midrapidity (| η | < 1 . 0). In pp collisions, the measured charged-particle multiplicity extends to about six times the average value, while in p-Pb collisions at forward (backward) rapidity a multiplicity corresponding to about three (four) times the average is reached. The ψ (2S) yield increases with the charged-particle pseudorapidity density. The ratio of ψ (2S) over J/ψ yield does not show a significant multiplicity dependence in either colliding system, suggesting a similar behavior of J/ψ and ψ (2S) yields with respect to charged-particle pseudorapidity density. Results for the ψ (2S) yield and its ratio with respect to J/ψ agree with available model calculations.
