Naslov
Centrality dependence of the charged-particle multiplicity density at mid-rapidity in Pb-Pb collisions at √sNN = 5.02 TeV

Autori
Adam, J. ; ... ; Antičić, Tome ; ... ; Erhardt, Filip ; ... ; Gotovac, Sven ; ... ; Mudnić, Eugen ; ... ; Planinić, Mirko ; ... ; Poljak, Nikola ; ... ; Simatović, Goran ; ... ; Utrobičić, Antonija ; ... ; Vicković, Linda ; ... ; Zyzak, M.

Kolaboracija
ALICE Collaboration

Izvornik
Physical review letters (0031-9007) 116 (2016); 222302, 12

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
centrality ; multiplicity density ; mid-rapidity ; lead-lead

Sažetak
The pseudorapidity density of charged particles (dNch/dη) at mid-rapidity in Pb-Pb collisions has been measured at a center-of-mass energy per nucleon pair of √sNN = 5.02 TeV. It increases with centrality and reaches a value of 1943±54 in |η|< 0.5 for the 5% most central collisions. A rise in dNch/dη as a function of √sNN for the most central collisions is observed, steeper than that observed in proton- proton collisions and following the trend established by measurements at lower energy. The centrality dependence of dNch/dη as a function of the average number of participant nucleons, ⟨Npart⟩, calculated in a Glauber model, is compared with the previous measurement at lower energy. A constant factor of about 1.2 describes the increase in 2⟨Npart⟩ ⟨dNch/dη⟩ from √sNN = 2.76 TeV to √sNN = 5.02 TeV for all centrality intervals, 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.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

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