Charged-particle multiplicity density at midrapidity in central Pb-Pb collisions at root s(NN)=2.76 TeV

K. Aamodt...[et al.]; B. Abelev; A. Quintana; Hans Bøggild; Hans Hjersing Dalsgaard; Børge Svane Nielsen; Ian Bearden; Christian Holm Christensen; Jens Jørgen Gaardhøje; Gaël Renault; Carsten Søgaard

doi:10.1103/PhysRevLett.105.252301

Charged-particle multiplicity density at midrapidity in central Pb-Pb collisions at root s(NN)=2.76 TeV

K. Aamodt...[et al.], B. Abelev, A. Quintana, Hans Bøggild, Hans Hjersing Dalsgaard, Børge Svane Nielsen, Ian Bearden, Christian Holm Christensen, Jens Jørgen Gaardhøje, Gaël Renault, Carsten Søgaard

350 Citations (Scopus)

Abstract

The first measurement of the charged-particle multiplicity density at midrapidity in Pb-Pb collisions at a center-of-mass energy per nucleon pair √s_NN=2.76TeV 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 √s_NN=0.2TeV. This measurement provides the first experimental constraint for models of nucleus-nucleus collisions at LHC energies.

Original language	English
Journal	Physical Review Letters
Volume	105
Issue number	25
Pages (from-to)	252301
Number of pages	11
ISSN	0031-9007
DOIs	https://doi.org/10.1103/PhysRevLett.105.252301
Publication status	Published - 13 Dec 2010

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Aamodt...[et al.], K., Abelev, B., Quintana, A., Bøggild, H., Dalsgaard, H. H., Nielsen, B. S., Bearden, I., Christensen, C. H., Gaardhøje, J. J., Renault, G., & Søgaard, C. (2010). Charged-particle multiplicity density at midrapidity in central Pb-Pb collisions at root s(NN)=2.76 TeV. Physical Review Letters, 105(25), 252301. https://doi.org/10.1103/PhysRevLett.105.252301

Aamodt...[et al.], K, Abelev, B, Quintana, A, Bøggild, H, Dalsgaard, HH, Nielsen, BS , Bearden, I , Christensen, CH , Gaardhøje, JJ, Renault, G & Søgaard, C 2010, 'Charged-particle multiplicity density at midrapidity in central Pb-Pb collisions at root s(NN)=2.76 TeV', Physical Review Letters, vol. 105, no. 25, pp. 252301. https://doi.org/10.1103/PhysRevLett.105.252301

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title = "Charged-particle multiplicity density at midrapidity in central Pb-Pb collisions at root s(NN)=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 nucleon pair √sNN=2.76TeV 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=0.2TeV. This measurement provides the first experimental constraint for models of nucleus-nucleus collisions at LHC energies.",

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doi = "10.1103/PhysRevLett.105.252301",

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T1 - Charged-particle multiplicity density at midrapidity in central Pb-Pb collisions at root s(NN)=2.76 TeV

AU - Aamodt...[et al.], K.

AU - Abelev, B.

AU - Quintana, A.

AU - Bøggild, Hans

AU - Dalsgaard, Hans Hjersing

AU - Nielsen, Børge Svane

AU - Bearden, Ian

AU - Christensen, Christian Holm

AU - Gaardhøje, Jens Jørgen

AU - Renault, Gaël

AU - Søgaard, Carsten

PY - 2010/12/13

Y1 - 2010/12/13

N2 - 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=2.76TeV 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=0.2TeV. This measurement provides the first experimental constraint for models of nucleus-nucleus collisions at LHC energies.

AB - 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=2.76TeV 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=0.2TeV. This measurement provides the first experimental constraint for models of nucleus-nucleus collisions at LHC energies.

U2 - 10.1103/PhysRevLett.105.252301

DO - 10.1103/PhysRevLett.105.252301

M3 - Journal article

SN - 0031-9007

VL - 105

SP - 252301

JO - Physical Review Letters

JF - Physical Review Letters

IS - 25

ER -

Charged-particle multiplicity density at midrapidity in central Pb-Pb collisions at root s(NN)=2.76 TeV

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