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

Charged-Particle Multiplicity Density at Midrapidity in Central Pb-Pb Collisions at root s(NN)=2.76 TeV / Aamodt, K., Abel, N., Abeysekara, U., Abrahantes Quintana, A., Abramyan, A., Adamová, D., Aggarwal, M.M., Aglieri Rinella, G., Agocs, A.G., Aguilar Salazar, S., Ahammed, Z., Ahmad, A., Ahmad, N., Ahn, S.U., Akimoto, R., Akindinov, A., Aleksandrov, D., Alessandro, B., Alfaro Molina, R., Alici, A., et al.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - STAMPA. - 105:25(2010). [10.1103/PhysRevLett.105.252301]

Charged-Particle Multiplicity Density at Midrapidity in Central Pb-Pb Collisions at root s(NN)=2.76 TeV

Bruno, G. E.;
2010

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 root s(NN) = 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 root s(NN) = 0.2 TeV. This measurement provides the first experimental constraint for models of nucleus-nucleus collisions at LHC energies.
2010
Charged-Particle Multiplicity Density at Midrapidity in Central Pb-Pb Collisions at root s(NN)=2.76 TeV / Aamodt, K., Abel, N., Abeysekara, U., Abrahantes Quintana, A., Abramyan, A., Adamová, D., Aggarwal, M.M., Aglieri Rinella, G., Agocs, A.G., Aguilar Salazar, S., Ahammed, Z., Ahmad, A., Ahmad, N., Ahn, S.U., Akimoto, R., Akindinov, A., Aleksandrov, D., Alessandro, B., Alfaro Molina, R., Alici, A., et al.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - STAMPA. - 105:25(2010). [10.1103/PhysRevLett.105.252301]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11589/3280
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