skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Suppression of Charged Particle Production at Large Transverse Momentum in Central Pb-Pb Collisions at sNN = 2.76 TeV

Abstract

Inclusive transverse momentum spectra of primary charged particles in Pb-Pb collisions at {radical}s{sub NN} = 2.76 TeV have been measured by the ALICE Collaboration at the LHC. The data are presented for central and peripheral collisions, corresponding to 0--5% and 70-80% of the hadronic Pb-PB cross section. The measured charged particle spectra in |{eta}| < 0.8 and 0.3 < p{sub T} < 20 GeV/c are compared to the expectation in pp collisions at the same {radical}s{sub NN}, scaled by the number of underlying nucleon-nucleon collisions. The comparison is expressed in terms of the nuclear modification factor R{sub AA}. The result indicates only weak medium effects (R{sub AA} {approx} 0.7) in peripheral collisions. In central collisions, R{sub AA} reaches a minimum of about 0.14 at p{sub T} = 6--7 GeV/c and increases significantly at larger p{sub T}. The measured suppression of high-p{sub T} particles is stronger than that observed at lower collision energies, indicating that a very dense medium is formed in central Pb-Pb collisions at the LHC.

Authors:
 [1];  [2];  [2];  [2];  [3]
  1. University of Oslo, Norway
  2. ORNL
  3. The
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1006477
DOE Contract Number:  
DE-AC05-00OR22725
Resource Type:
Journal Article
Journal Name:
Physics Letters B
Additional Journal Information:
Journal Volume: 696; Journal Issue: 1-2; Journal ID: ISSN 0370-2693
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ALICE; CHARGED PARTICLES; COLLISIONS; CROSS SECTIONS; DATA; INHIBITION; LEAD; MODIFICATIONS; PARTICLES; PERIPHERAL COLLISIONS; PRODUCTION; SPECTRA; TRANSVERSE MOMENTUM

Citation Formats

Aamodt, K., Awes, Terry C, Read Jr, Kenneth F, Silvermyr, David O, and ALICE, Collaboration. Suppression of Charged Particle Production at Large Transverse Momentum in Central Pb-Pb Collisions at sNN = 2.76 TeV. United States: N. p., 2011. Web. doi:10.1016/j.physletb.2010.12.020.
Aamodt, K., Awes, Terry C, Read Jr, Kenneth F, Silvermyr, David O, & ALICE, Collaboration. Suppression of Charged Particle Production at Large Transverse Momentum in Central Pb-Pb Collisions at sNN = 2.76 TeV. United States. doi:10.1016/j.physletb.2010.12.020.
Aamodt, K., Awes, Terry C, Read Jr, Kenneth F, Silvermyr, David O, and ALICE, Collaboration. Sat . "Suppression of Charged Particle Production at Large Transverse Momentum in Central Pb-Pb Collisions at sNN = 2.76 TeV". United States. doi:10.1016/j.physletb.2010.12.020.
@article{osti_1006477,
title = {Suppression of Charged Particle Production at Large Transverse Momentum in Central Pb-Pb Collisions at sNN = 2.76 TeV},
author = {Aamodt, K. and Awes, Terry C and Read Jr, Kenneth F and Silvermyr, David O and ALICE, Collaboration},
abstractNote = {Inclusive transverse momentum spectra of primary charged particles in Pb-Pb collisions at {radical}s{sub NN} = 2.76 TeV have been measured by the ALICE Collaboration at the LHC. The data are presented for central and peripheral collisions, corresponding to 0--5% and 70-80% of the hadronic Pb-PB cross section. The measured charged particle spectra in |{eta}| < 0.8 and 0.3 < p{sub T} < 20 GeV/c are compared to the expectation in pp collisions at the same {radical}s{sub NN}, scaled by the number of underlying nucleon-nucleon collisions. The comparison is expressed in terms of the nuclear modification factor R{sub AA}. The result indicates only weak medium effects (R{sub AA} {approx} 0.7) in peripheral collisions. In central collisions, R{sub AA} reaches a minimum of about 0.14 at p{sub T} = 6--7 GeV/c and increases significantly at larger p{sub T}. The measured suppression of high-p{sub T} particles is stronger than that observed at lower collision energies, indicating that a very dense medium is formed in central Pb-Pb collisions at the LHC.},
doi = {10.1016/j.physletb.2010.12.020},
journal = {Physics Letters B},
issn = {0370-2693},
number = 1-2,
volume = 696,
place = {United States},
year = {2011},
month = {1}
}