paper

Suppression of charged particle production at large transverse momentum in central Pb-Pb collisions at TeV

arXiv:1012.1004 · doi:10.1016/j.physletb.2010.12.020

Abstract

Inclusive transverse momentum spectra of primary charged particles in Pb-Pb collisions at = 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 and GeV/ are compared to the expectation in pp collisions at the same , scaled by the number of underlying nucleon-nucleon collisions. The comparison is expressed in terms of the nuclear modification factor . The result indicates only weak medium effects ( 0.7) in peripheral collisions. In central collisions, reaches a minimum of about 0.14 at -7GeV/ and increases significantly at larger . The measured suppression of high- 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.

15 pages, 5 captioned figures, 3 tables, authors from page 10, published version, figures at http://aliceinfo.cern.ch/ArtSubmission/node/989

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