Inclusive transverse momentum spectra of primary charged particles in Pb–Pb collisions at √sNN = 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 |η| < 0.8 and 0.3 < pT < 20 GeV/c are compared to the expectation in pp collisions at the same √sNN, scaled by the number of underlying nucleon–nucleon collisions. The comparison is expressed in terms of the nuclear modification factor RAA. The result indicates only weak medium effects (RAA ≈ 0.7) in peripheral collisions. In central collisions, RAA reaches a minimum of about 0.14 at pT = 6–7 GeV/c and increases significantly at larger pT . The measured suppression of high-pT 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.

Suppression of charged particle production at large transverse momentum in central Pb–Pb collisions at √sNN = 2.76 TeV / K., A.a., A., A.Q.b., D., A., A. M., A., M. M., A.e., G., A.R.f., A. G., A.g., S., A.S.h., Z., A.i., N., A., A., A.M.j., S. U., A., 1, ., A., A.l., D., A., B., A.n., R., A.M.h., A., A.o., 2, ., A., A., et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - STAMPA. - 696/2011:(2011), pp. 30-39. [10.1016/j.physletb.2010.12.020]

Suppression of charged particle production at large transverse momentum in central Pb–Pb collisions at √sNN = 2.76 TeV

LEA, RAMONA;BREGANT, MARCO;CAMERINI, Paolo;CONTIN, GIACOMO;FRAGIACOMO, ENRICO;GROSSO, Raffaele;MARGAGLIOTTI, GIACOMO;PIANO, STEFANO;RUI, RINALDO;VACCHI, Andrea;VENARUZZO, MASSIMO;
2011-01-01

Abstract

Inclusive transverse momentum spectra of primary charged particles in Pb–Pb collisions at √sNN = 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 |η| < 0.8 and 0.3 < pT < 20 GeV/c are compared to the expectation in pp collisions at the same √sNN, scaled by the number of underlying nucleon–nucleon collisions. The comparison is expressed in terms of the nuclear modification factor RAA. The result indicates only weak medium effects (RAA ≈ 0.7) in peripheral collisions. In central collisions, RAA reaches a minimum of about 0.14 at pT = 6–7 GeV/c and increases significantly at larger pT . The measured suppression of high-pT 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.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11368/2308174
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