Naslov
Centrality dependence of the pseudorapidity density distribution for charged particles in Pb- -Pb collisions at √sNN = 5.02 TeV

Autori
Adam, J. ; ... ; Antičić, Tome ; ... ; Erhardt, Filip ; ... ; Gotovac, Sven ; ... ; Jerčić, Marko ; ... ; Lončar, Petra ; ... ; Mudnić, Eugen ; ... ; Planinić, Mirko ; ... ; Poljak, Nikola ; ... ; Simatović, Goran ; ... ; Utrobičić, Antonija ; ... ; Vicković, Linda ; ... ; Zmeskal, J.

Kolaboracija
ALICE Collaboration

Izvornik
Physics letters. B (0370-2693) 772 (2017); 567-577

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

Ključne riječi
centrality, pseudorapidity, Pb-Pb

Sažetak
We present the charged-particle pseudorapidity density in Pb-Pb collisions at √sNN=5.02TeV in centrality classes measured by ALICE. The measurement covers a wide pseudorapidity range from −3.5 to 5, which is sufficient for reliable estimates of the total number of charged particles produced in the collisions. For the most central (0-5%) collisions we find 21400±1300 while for the most peripheral (80- 90%) we find 230±38. This corresponds to an increase of (27±4) over the results at √sNN =2.76TeV previously reported by ALICE. The energy dependence of the total number of charged particles produced in heavy-ion collisions is found to obey a modified power- law like behaviour. The charged-particle pseudorapidity density of the most central collisions is compared to model calculations -- - none of which fully describes the measured distribution. We also present an estimate of the rapidity density of charged particles. The width of that distribution is found to exhibit a remarkable proportionality to the beam rapidity, independent of the collision energy from the top SPS to LHC energies.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

POVEZANOST RADA