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Charged-particle multiplicity density at midrapidity in central Pb-Pb collisions at sqrt[S(NN)] = 2.76 TeV |
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| Authors: | Aamodt K Abelev B Quintana A Abrahantes Adamová D Adare A M Aggarwal M M Rinella G Aglieri Agocs A G Salazar S Aguilar Ahammed Z Masoodi A Ahmad Ahmad N Ahn S U Akindinov A Aleksandrov D Alessandro B Molina R Alfaro Alici A Alkin A Avi?a E Almaráz Alt T Altini V Altinpinar S Altsybeev I Andrei C Andronic A Anguelov V Anson C Anti?i? T Antinori F Antonioli P Aphecetche L Appelsh?user H Arbor N Arcelli S Arend A Armesto N Arnaldi R Aronsson T Arsene I C Asryan A Augustinus A Averbeck R Awes T C Ayst? J Azmi M D Bach M Badalà A Baek Y W Bagnasco S Bailhache R Bala R Ferroli R Baldini |
| Institution: | Department of Physics and Technology, University of Bergen, Bergen, Norway. |
| 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 = 2.76 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 √ S NN = 2.76 TeV. This measurement provides the first experimental constraint for models of nucleus-nucleus collisions at LHC energies. |
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