Journal
PHYSICS LETTERS B
Volume 710, Issue 3, Pages 363-382Publisher
ELSEVIER
DOI: 10.1016/j.physletb.2012.02.045
Keywords
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Funding
- ANPCyT, Argentina
- YerPhI, Armenia
- ARC, Australia
- BMWF, Austria
- ANAS, Azerbaijan
- SSTC, Belarus
- CNPq, Brazil
- FAPESP, Brazil
- NSERC, Canada
- NRC, Canada
- CFI, Canada
- CERN
- CONICYT, Chile
- CAS, China
- MOST, China
- NSFC, China
- COLCIENCIAS, Colombia
- MSMT CR, Czech Republic
- MPO CR, Czech Republic
- VSC CR, Czech Republic
- DNRF, Denmark
- DNSRC, Denmark
- Lundbeck Foundation, Denmark
- ARTEMIS
- European Union
- IN2P3-CNRS, France
- CEA-DSM/IRFU, France
- GNAS, Georgia
- BMBF, Germany
- DFG, Germany
- HGF, Germany
- MPG, Germany
- AvH Foundation, Germany
- GSRT, Greece
- ISF, Israel
- MINERVA, Israel
- GIF, Israel
- DIP, Israel
- Benoziyo Center, Israel
- INFN, Italy
- MEXT, Japan
- JSPS, Japan
- CNRST, Morocco
- FOM, Netherlands
- NWO, Netherlands
- RCN, Norway
- MNiSW, Poland
- GRICES, Portugal
- FCT, Portugal
- MERYS (MECTS), Romania
- MES of Russia
- ROSATOM, Russian Federation
- JINR
- MSTD, Serbia
- MSSR, Slovakia
- ARRS, Slovenia
- MVZT, Slovenia
- DST/NRF, South Africa
- MICINN, Spain
- SRC, Sweden
- Wallenberg Foundation, Sweden
- SER, Switzerland
- SNSF, Switzerland
- Canton of Bern, Switzerland
- Canton of Geneva, Switzerland
- NSC, Taiwan
- TAEK, Turkey
- STFC, United Kingdom
- Royal Society, United Kingdom
- Leverhulme Trust, United Kingdom
- DOE, United States of America
- NSF, United States of America
- Division Of Physics
- Direct For Mathematical & Physical Scien [1119200] Funding Source: National Science Foundation
- Science and Technology Facilities Council [ATLAS, ST/K001418/1, ST/J004944/1, ST/H001093/2, ST/G502320/1, PP/E003699/1, ST/M001431/1, ST/M001512/1, ST/H001026/1, ST/H001069/2, ST/K001361/1 MINOS/MINOS+, ST/H001026/2, ST/I005803/1, ST/M001474/1, ST/I003142/1, ST/K001329/1 ATLAS, ST/I003525/1, ST/K001361/1 ATLAS, ST/K001248/1, ST/I005803/1 GRIDPP, ST/K001264/1 ATLAS, ST/K001337/1, ST/K001361/1, ST/H001093/1, ST/K001361/1 LHCb Upgrades, PP/E000347/1, ST/J004928/1 ATLAS Upgrade, ST/K001361/1 LHCb, ST/J002798/1, ST/K001248/1 ATLAS, ST/J005576/1, ST/I000186/1, ST/K001337/1 ATLAS, ST/I006080/1, ST/J004928/1, PP/E003087/1, ST/I003517/1, ST/L001144/1, PP/E003699/2, GRIDPP, ST/K00073X/1, ST/F007337/1, ST/K001361/1 ATLAS Upgrades] Funding Source: researchfish
- STFC [ST/L001144/1, ST/J004928/1, ST/G502320/1, ST/I006080/1, ST/H001093/1, ST/H001026/1, ST/I003142/1, ST/M000753/1, ST/F007337/1, ST/J004944/1, PP/E003699/2, ST/J005576/1, ST/H001069/2, ST/K001361/1, ST/I003525/1, ST/I005803/1, PP/E003087/1, ST/I000186/1, ST/J002798/1, ST/K001329/1, ST/M001431/1, ST/H001093/2, ST/K001248/1, ST/K00073X/1, ST/M001512/1, PP/E003699/1, ST/H001026/2, ST/K001337/1, PP/E000347/1, ST/I003517/1] Funding Source: UKRI
- ICREA Funding Source: Custom
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The ATLAS experiment at the LHC has measured the centrality dependence of charged particle pseudorapidity distributions over vertical bar eta vertical bar < 2 in lead-lead collisions at a nucleon-nucleon centre-of-mass energy of root s(NN) = 2.76 TeV. In order to include particles with transverse momentum as low as 30 MeV, the data were recorded with the central solenoid magnet off. Charged particles were reconstructed with two algorithms (2-point tracklets and full tracks) using information from the pixel detector only. The lead-lead collision centrality was characterized by the total transverse energy in the forward calorimeter in the range 3.2 < vertical bar eta vertical bar< 4.9. Measurements are presented of the per-event charged particle pseudorapidity distribution, dN(ch)/d eta, and the average charged particle multiplicity in the pseudorapidity interval vertical bar eta vertical bar < 0.5 in several intervals of collision centrality. The results are compared to previous mid-rapidity measurements at the LHC and RHIC. The variation of the mid-rapidity charged particle yield per colliding nucleon pair with the number of participants is consistent with lower root s(NN) results. The shape of the dN(ch)/d eta distribution is found to be independent of centrality within the systematic uncertainties of the measurement. (C) 2012 CERN. Published by Elsevier B.V. All rights reserved.
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