Suppression of Charged Particle Production at Large Transverse Momentum in Central Pb-Pb Collisions at sNN = 2.76 TeV
- University of Oslo, Norway
- ORNL
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.
- Research Organization:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- DOE Contract Number:
- DE-AC05-00OR22725
- OSTI ID:
- 1006477
- Journal Information:
- Physics Letters B, Vol. 696, Issue 1-2; ISSN 0370-2693
- Country of Publication:
- United States
- Language:
- English
Similar Records
Measurement of jet suppression in central Pb–Pb collisions at
Measurement of the production of high-pT electrons from heavy-flavour hadron decays in Pb–Pb collisions at