Production of charged pions, kaons and protons at large transverse momenta in pp and Pb-Pb collisions at $\sqrt{s_{NN}}$ = 2.76 TeV
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2014-09Author
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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.
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Alme J, Altinpinar S, Djuvsland Ø, Fehlker D, Haaland ØS, Huang M, Lønne P, Nystrand J, Rehman Au, Røhrich D, Skjerdal K, Ullaland K, Wagner B, Yang S, Arsene IC, Bätzing P, Dordic O, Eyyubova G, Lindal S, Løvhøiden G, Milosevic J, Qvigstad H, Richter M, Røed K, Skaali TB, Tveter TS, Wikne JC, Zhao C, Langøy R, Lien JA, Abelev B, Adam J, Adamová D, Adare AM, Aggarwal MM, Aglieri Rinella G, Agocs AG, Agostinelli A, Aguilar Salazar S, Ahammed Z, Ahmad N, Ahmad Masoodi A, Ahn SU, Ahn S, Ajaz M, ALICE C, Windelband B, Zampolli C, Zaporozhets S, Zarochentsev A. Production of charged pions, kaons and protons at large transverse momenta in pp and Pb-Pb collisions at √sNN=2.76 TeV. Physics Letters B. 2014;736:196-207Publisher
ElsevierSubject
Identified particle productionHigh pTParticle ratiosBaryon anomalyNuclear modification factorALICELHCCollections
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