Naslov
Charged-Particle Multiplicity Density at Midrapidity in Central Pb-Pb Collisions at √sNN=2.76 TeV

Autori
Aamodt, K. ; ... ; Antičić, Tome ; ... ; Gotovac, Sven ; ... ; Mudnić, Eugen ; ... ; Šuša, Tatjana ; ... ; Vicković, Linda ; ... ; Zynovyev, M.

Izvornik
Physical Review Letters (0031-9007) 105 (2010), 25; 252301-1

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

Ključne riječi
LHC; ALICE; 2.76 TeV; Charged Particle Multiplicity

Sažetak
The first measurement of the charged-particle multiplicity density at midrapidity in Pb-Pb collisions at a center-of-mass energy per nucleon pair √sNN=2.76 TeV is presented. For an event sample corresponding to the most central 5% of the hadronic cross section, the pseudorapidity density of primary charged particles at midrapidity is 1584±4(stat)±76(syst), which corresponds to 8.3±0.4(syst) per participating nucleon pair. This represents an increase of about a factor 1.9 relative to pp collisions at similar collision energies, and about a factor 2.2 to central Au-Au collisions at √sNN=0.2  TeV. This measurement provides the first experimental constraint for models of nucleus-nucleus collisions at LHC energies.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

Napomena
The ALICE Collaboration

POVEZANOST RADA