Naslov
Charged-particle multiplicity measurement in proton–proton collisions at √s = 7 TeV with ALICE at LHC

Autori
Aamodt, K. ; ... ; Antičić, Tome ; ... ; Gotovac, Sven ; ... ; Mudnić, Eugen ; ... ; Šuša, Tatjana ; ... ; Vicković, Linda ; ... ; Zynovyev, M. (The ALICE Collaboration)

Izvornik
The European Physical Journal C - Particles and Fields (1434-6044) 68 (2010), 3/4; 345-354

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

Ključne riječi
LHC; ALICE; p+p; charged-particle; multiplicity

Sažetak
The pseudorapidity density and multiplicity distribution of charged particles produced in proton–proton collisions at the LHC, at a centre-of-mass energy √s = 7 TeV, were measured in the central pseudorapidity region |η| < 1. Comparisons are made with previous measurements at √s = 0.9 TeV and 2.36 TeV. At √s = 7 TeV, for events with at least one charged particle in |η| < 1, we obtain dNch/dη = 6.01 ± 0.01(stat.) +0.20 −0.12(syst.). This corresponds to an increase of 57.6%±0.4%(stat.) +3.6 −1.8%(syst.) relative to collisions at 0.9 TeV, significantly higher than calculations from commonly used models. The multiplicity distribution at 7 TeV is described fairly well by the negative binomial distribution.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

POVEZANOST RADA