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Production of charged pions, kaons and protons at large transverse momenta in pp and Pb-Pb collisions at sqrt(sNN) = 2.76 TeV

Abstract : Transverse momentum spectra of Pi+/-, K+/- and p(anti-p) up to pT = 20 GeV/c at mid-rapidity, |y| ~< 0.8, in pp and Pb-Pb collisions at sqrt(sNN) = 2.76 TeV have been measured using the ALICE detector at the LHC. At intermediate pT (2-8 GeV/c) an enhancement of the proton-to-proton ratio, (p + anti-p)/(Pi+ + Pi-), with respect to pp collisions is observed and the ratio reaches ~0.80 in central Pb-Pb collisions. The measurement of the nuclear modification factors for Pi+/-, K+/- and p(anti-p) indicates that within the systematic and statistical uncertainties they are the same at high pT (> 10 GeV/c), suggesting that the chemical composition of leading particles from jets in the medium is similar to that of vacuum jets.
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http://hal.in2p3.fr/in2p3-00925441
Contributor : Sylvie Flores <>
Submitted on : Wednesday, January 8, 2014 - 10:08:24 AM
Last modification on : Tuesday, January 5, 2021 - 9:30:19 AM

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Laurent Aphecetche, Y.W. Baek, V. Barret, N. Bastid, Guillaume Batigne, et al.. Production of charged pions, kaons and protons at large transverse momenta in pp and Pb-Pb collisions at sqrt(sNN) = 2.76 TeV. Physics Letters B, Elsevier, 2014, 736, pp.196-207. ⟨10.1016/j.physletb.2014.07.011⟩. ⟨in2p3-00925441⟩

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