Inclusive transverse momentum spectra of primary charged particles in Pb–Pb collisions at sqrtS_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 |η|<0.8 and 0.3<pT<20 GeV/c are compared to the expectation in pp collisions at the same sqrt(S_NN), 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 root s(NN)=2.76 TeV
SORAMEL, FRANCESCA;CAFFARRI, DAVIDE;LUNARDON, MARCELLO;MORANDO, MAURIZIO;MORETTO, SANDRA;SCARLASSARA, FERNANDO;SEGATO, GIANFRANCO;TERREVOLI C;VIESTI, GIUSEPPE;
2011
Abstract
Inclusive transverse momentum spectra of primary charged particles in Pb–Pb collisions at sqrtS_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 |η|<0.8 and 0.3
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