Production of charged pions, kaons and protons at large transverse momenta in pp and Pb-Pb collisions at \(\sqrt{s_{NN}}\) = 2.76 TeV
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 Rudolph; 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
Peer reviewed, Journal article
Published version
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Permanent lenke
https://hdl.handle.net/1956/17146Utgivelsesdato
2014-09Metadata
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Originalversjon
https://doi.org/10.1016/j.physletb.2014.07.011Sammendrag
Transverse momentum spectra of \(\pi^{\pm}, K^{\pm}\) and \(p(\bar{p})\) up to \(p_T\) = 20 GeV/c at mid-rapidity, |y| \(\le\) 0.8, in pp and Pb-Pb collisions at \(\sqrt{s_{NN}}\) = 2.76 TeV have been measured using the ALICE detector at the LHC. At intermediate \(p_T\) (2-8 GeV/c) an enhancement of the proton-to-proton ratio, (p + \(\bar{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 \(\pi^{\pm}, K^{\pm}\) and \(p(\bar{p})\) indicates that within the systematic and statistical uncertainties they are the same at high \(p_T\) (> 10 GeV/c), suggesting that the chemical composition of leading particles from jets in the medium is similar to that of vacuum jets.