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Zhu, Hongsheng; Qvigstad, Henrik; Zhao, Chengxin; Aleksandrov, Dimitry; Alici, Andrea; Belmont-Moreno, E; Berdnikov, Y; Blair, JT; Buncic, P; Castro, AJ; Chang, B; Chibante Barroso, V; Chinellato, DD; Christiansen, P; Drozhzhova, T; Dubla, A; Epple, E; Evans, D; Evdokimov, S; Figiel, J; Finogeev, D; Francescon, A; Gauger, EF; Gorbunov, S; Görlich, L; Graham, KL; Hamagaki, H; Hess, BA; Hippolyte, B; Hussain, T; Izucheev, V; Jadlovska, S; Jena, S; Karavicheva, T; Kim, H; Kluge, A; Knichel, ML; Kondratyeva, N; Kondratyuk, E; Kopcik, M; Kour, M; Kowalski, M; Kralik, I; Kubera, AM; Kumar, L; La Pointe, SL; Lattuca, A; Li, X; Lien, J; Lindenstruth, V; Ljunggren, HM; Malaev, M; Mamonov, A; Montes, E; Moreno, LAP; Morreale, A; Naik, B; Navarro, SR; Nikulin, S; Nikulin, V; Nyanin, A; Nystrand, J; Pagano, P; Pappalardo, GS; Peitzmann, T; Pikna, M; Planinic, M; Pochybova, S; Qvigstad, H; Rakotozafindrabe, A; Read, KF; Reygers, K; Richert, T; Ryabinkin, E; Safarik, K; Sahoo, R; Scott, R; Selyuzhenkov, I; Shahoyan, R; Singh, R; Singhal, V; Sinha, T; Sitar, B; Spiriti, E; Sputowska, I; Stenlund, E; Terrevoli, C; Tumkin, A; Vande Vyvre, P; Varga, D; Vilakazi, Z; Villalobos Baillie, O; Vranic, D; Weiser, DF; Wessels, JP; Yin, Z; Zaccolo, V; Zhang, Z; Zhigareva, N; Zyzak, M
Physical review letters, 06/2016, Letnik: 116, Številka: 22Journal Article
The pseudorapidity density of charged particles, dNch / d η , at midrapidity in Pb-Pb collisions has been measured at a center-of-mass energy per nucleon pair of √ s N N = 5.02 TeV . For the 5% most central collisions, we measure a value of 1943 ± 54 . The rise in dNch / d η as a function of √ s N N is steeper than that observed in proton-proton collisions and follows the trend established by measurements at lower energy. The increase of dNch / d η as a function of the average number of participant nucleons, ⟨ N part ⟩ , calculated in a Glauber model, is compared with the previous measurement at √ s N N = 2.76 TeV . A constant factor of about 1.2 describes the increase in dNch / d η from √ s N N = 2.76 to 5.02 TeV for all centrality classes, within the measured range of 0%–80% centrality. The results are also compared to models based on different mechanisms for particle production in nuclear collisions.
