Aamodt, K. ; Sinha, B. C. ; et., al (2010) Charged-particle multiplicity density at midrapidity in central Pb-Pb collisions at √sNN=2.76 TeV Physical Review Letters, 105 (25). 252301_1-252301_11. ISSN 0031-9007
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Official URL: http://prl.aps.org/abstract/PRL/v105/i25/e252301
Related URL: http://dx.doi.org/10.1103/PhysRevLett.105.252301
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=2.76 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 √sNN=0.2 TeV. This measurement provides the first experimental constraint for models of nucleus-nucleus collisions at LHC energies.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to The American Physical Society. |
| ID Code: | 70330 |
| Deposited On: | 21 Nov 2011 09:09 |
| Last Modified: | 21 Nov 2011 09:09 |
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