Charged-Particle Multiplicity Density at Midrapidity in Central Pb-Pb Collisions at sNN = 2.76 TeV
- University of Oslo, Norway
- ORNL
The first measurement of the charged-particle multiplicity density at midrapidity in Pb-Pb collisions at a center-of-mass energy per nculeon pair {radical}{ovr s{sub NN}} = 2.87 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 facor 1.9 relative to pp collisions at similar collision energies, and about a factor 2.2 to central Au-Au collisions at {radical}{ovr s{sub NN}} = 0.2 TeV. This measurement provides the first experimental constraint for models of nucleus-nucleus collisions at LHC energies.
- Research Organization:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- DOE Contract Number:
- DE-AC05-00OR22725
- OSTI ID:
- 1006479
- Journal Information:
- Physical Review Letters, Vol. 105, Issue 25; ISSN 0031--9007
- Country of Publication:
- United States
- Language:
- English
Similar Records
Centrality Dependence of the Charged-Particle Multiplicity Density at Midrapidity in Pb-Pb Collisions at {radical}(s{sub NN})=2.76 TeV
Centrality Dependence of the Charged-Particle Multiplicity Density at Midrapidity in Pb-Pb Collisions at root s(NN)=2.76 TeV