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

Transverse momentum spectra of π±, K±and p(¯p)up to pT=20GeV/cat mid-rapidity in pp, peripheral (60–80%) and central (0–5%) Pb–Pb collisions at √sNN=2.76TeVhave been measured using the ALICE detector at the Large Hadron Collider. The proton-to-pion and the kaon-to-pion ratios both show adistinct pea...

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Main Authors: Alme, Johan, Altinpinar, Sedat, Djuvsland, Øystein, Fehlker, Dominik, Haaland, Øystein Senneset, Huang, Meidana, Lønne, Per-Ivar, Nystrand, Joakim, Rehman, Attiq ur, Røhrich, Dieter, Skjerdal, Kyrre, Ullaland, Kjetil, Wagner, Boris, Yang, Shiming, Arsene, Ionut Christian, Bätzing, Paul Christoph, Dordic, Olja, Eyyubova, Gyulnara, Lindal, Svein, Løvhøiden, Gunnar, Milosevic, Jovan, Qvigstad, Henrik, Richter, Matthias, Røed, Ketil, Skaali, Toralf Bernhard, Tveter, Trine Spedstad, Wikne, Jon Christopher, Zhao, Chengxin, Langøy, Rune, Lien, Jørgen, Abelev, Betty, Adam, Jaroslav, Adamová, Dagmar, Adare, Andrew Marshall, Aggarwal, Madan M, Aglieri Rinella, Gianluca, Agocs, Andreas Gabor, Agostinelli, Andrea, Aguilar Salazar, Saul, Ahammed, Zubayer, Ahmad, Nazeer, Ahmad Masoodi, Arshar, Ahn, Sang Un, Ahn, Sul-Ah, Ajaz, Muhammad, ALICE, Collaboration, Windelband, B, Zampolli, C, Zaporozhets, S, Zarochentsev, A
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Language:English
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Summary:Transverse momentum spectra of π±, K±and p(¯p)up to pT=20GeV/cat mid-rapidity in pp, peripheral (60–80%) and central (0–5%) Pb–Pb collisions at √sNN=2.76TeVhave been measured using the ALICE detector at the Large Hadron Collider. The proton-to-pion and the kaon-to-pion ratios both show adistinct peak at pT≈3GeV/cin central Pb–Pb collisions. Below the peak, pT10GeV/cparticle ratios in ppand Pb–Pb collisions are in agreement and the nuclear modification factors for π±, K±and p(¯p)indicate that, within the systematic and statistical uncertainties, the suppression is the same. This suggests that the chemical composition of leading particles from jets in the medium is similar to that of vacuum jets.