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Title: Charged-Particle Multiplicity Density at Midrapidity in Central Pb-Pb Collisions at sNN = 2.76 TeV

Abstract

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.

Authors:
 [1];  [2];  [2];  [2];  [3]
  1. University of Oslo, Norway
  2. ORNL
  3. The
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1006479
DOE Contract Number:  
DE-AC05-00OR22725
Resource Type:
Journal Article
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 105; Journal Issue: 25; Journal ID: ISSN 0031--9007
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; CENTER-OF-MASS SYSTEM; CHARGED PARTICLES; COLLISIONS; CROSS SECTIONS; DENSITY; ENERGY; MULTIPLICITY; NUCLEONS; PARTICLE RAPIDITY

Citation Formats

Aamodt, K., Awes, Terry C, Read Jr, Kenneth F, Silvermyr, David O, and ALICE, Collaboration. Charged-Particle Multiplicity Density at Midrapidity in Central Pb-Pb Collisions at sNN = 2.76 TeV. United States: N. p., 2010. Web. doi:10.1103/PhysRevLett.105.252301.
Aamodt, K., Awes, Terry C, Read Jr, Kenneth F, Silvermyr, David O, & ALICE, Collaboration. Charged-Particle Multiplicity Density at Midrapidity in Central Pb-Pb Collisions at sNN = 2.76 TeV. United States. doi:10.1103/PhysRevLett.105.252301.
Aamodt, K., Awes, Terry C, Read Jr, Kenneth F, Silvermyr, David O, and ALICE, Collaboration. Fri . "Charged-Particle Multiplicity Density at Midrapidity in Central Pb-Pb Collisions at sNN = 2.76 TeV". United States. doi:10.1103/PhysRevLett.105.252301.
@article{osti_1006479,
title = {Charged-Particle Multiplicity Density at Midrapidity in Central Pb-Pb Collisions at sNN = 2.76 TeV},
author = {Aamodt, K. and Awes, Terry C and Read Jr, Kenneth F and Silvermyr, David O and ALICE, Collaboration},
abstractNote = {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.},
doi = {10.1103/PhysRevLett.105.252301},
journal = {Physical Review Letters},
issn = {0031--9007},
number = 25,
volume = 105,
place = {United States},
year = {2010},
month = {1}
}