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Abstract
The first measurement of the charged-particle multiplicity density at mid-rapidity in Pb-Pb collisions at a centre-of-mass energy per nucleon pair sqrt(sNN) = 2.76 TeV is presented. For an event sample corresponding to the most central 5% of the hadronic cross section the pseudo-rapidity density of primary charged particles at mid-rapidity is 1584 +- 4 (stat) +- 76 (sys.), which corresponds to 8.3 +- 0.4 (sys.) 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 sqrt(sNN) = 0.2 TeV. This measurement provides the first experimental constraint for models of nucleus-nucleus collisions at LHC energies.
Original language | English |
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Article number | 252301 |
Number of pages | 10 |
Journal | Physical Review Letters |
Volume | 105 |
Issue number | 25 |
DOIs | |
Publication status | Published - 13 Dec 2010 |
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Dive into the research topics of 'Charged-particle multiplicity density at mid-rapidity in central Pb-Pb collisions at √sNN=2.76 TeV'. Together they form a unique fingerprint.Projects
- 1 Finished
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Birmingham Nuclear Physics Group Rolling Grant
Tungate, G., Lazzeroni, C., Evans, P., Jones, P. & Freer, M.
SCIENCE & TECHNOLOGY FACILITIES COUNCIL
1/08/08 → 31/07/13
Project: Research Councils