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

ALICE Collaboration; Lee Stuart Barnby; Didier Alexandre; David Evans; Luke Hanratty; Peter Jones; Anton Jusko; Marian Krivda; Graham Lee; Roman Lietava; Patrick Scott; Orlando Villalobos Baillie

doi:10.1016/j.physletb.2014.07.011

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

ALICE Collaboration, Lee Stuart Barnby, Didier Alexandre, David Evans, Luke Hanratty, Peter Jones, Anton Jusko, Marian Krivda, Graham Lee, Roman Lietava, Patrick Scott, Orlando Villalobos Baillie

Physics and Astronomy

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Abstract

Transverse momentum spectra of π±, K± and p(p ̄) up to pT = 20 GeV/c at mid-rapidity in pp, peripheral (60–80%) and central (0–5%) Pb–Pb collisions at √sNN = 2.76 TeV have been measured using the ALICE detector at the Large Hadron Collider. The proton-to-pion and the kaon-to-pion ratios both show a distinct peak at pT ≈ 3 GeV/c in central Pb–Pb collisions. Below the peak, pT < 3 GeV/c, both ratios are in good agreement with hydrodynamical calculations, suggesting that the peak itself is dominantly the result of radial flow rather than anomalous hadronization processes. For pT > 10 GeV/c particle ratios in pp and 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.

Original language	English
Pages (from-to)	196-207
Number of pages	12
Journal	Physics Letters B
Volume	736
Early online date	15 Jul 2014
DOIs	https://doi.org/10.1016/j.physletb.2014.07.011
Publication status	Published - 7 Sept 2014

Keywords

Identified particle production
high-pt
particle ratios
baryon anomaly
nuclear modification factor
ALICE
LHC

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10.1016/j.physletb.2014.07.011Licence: Creative Commons: Attribution (CC BY)

ALICE_Production_charged_pions_2014Final published version, 689 KBLicence: Creative Commons: Attribution (CC BY)

Birmingham Nuclear Physics Consolidated Grant
Freer, M. (Principal Investigator), Evans, P. (Co-Investigator), Jones, P. (Co-Investigator), Wheldon, C. (Co-Investigator) & Lazzeroni, C. (Co-Investigator)
SCIENCE & TECHNOLOGY FACILITIES COUNCIL
1/08/11 → 31/07/14
Project: Research Councils

Cite this

ALICE Collaboration, Barnby, L. S., Alexandre, D., Evans, D., Hanratty, L., Jones, P., Jusko, A., Krivda, M., Lee, G., Lietava, R., Scott, P., & Villalobos Baillie, O. (2014). Production of charged pions, kaons and protons at large transverse momenta in pp and Pb–Pb collisions at√s_NN = 2.76 TeV. Physics Letters B, 736, 196-207. https://doi.org/10.1016/j.physletb.2014.07.011

@article{9be1992b02dc424f800e14044ce24417,

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

abstract = "Transverse momentum spectra of π±, K± and p(p{\= }) up to pT = 20 GeV/c at mid-rapidity in pp, peripheral (60–80%) and central (0–5%) Pb–Pb collisions at √sNN = 2.76 TeV have been measured using the ALICE detector at the Large Hadron Collider. The proton-to-pion and the kaon-to-pion ratios both show a distinct peak at pT ≈ 3 GeV/c in central Pb–Pb collisions. Below the peak, pT < 3 GeV/c, both ratios are in good agreement with hydrodynamical calculations, suggesting that the peak itself is dominantly the result of radial flow rather than anomalous hadronization processes. For pT > 10 GeV/c particle ratios in pp and 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.",

keywords = "Identified particle production, high-pt, particle ratios, baryon anomaly, nuclear modification factor, ALICE, LHC",

author = "{ALICE Collaboration} and Barnby, {Lee Stuart} and Didier Alexandre and David Evans and Luke Hanratty and Peter Jones and Anton Jusko and Marian Krivda and Graham Lee and Roman Lietava and Patrick Scott and {Villalobos Baillie}, Orlando",

year = "2014",

month = sep,

day = "7",

doi = "10.1016/j.physletb.2014.07.011",

language = "English",

volume = "736",

pages = "196--207",

journal = "Physics Letters B",

issn = "0370-2693",

publisher = "Elsevier",

}

ALICE Collaboration, Barnby, LS, Alexandre, D, Evans, D, Hanratty, L, Jones, P, Jusko, A, Krivda, M, Lee, G, Lietava, R, Scott, P & Villalobos Baillie, O 2014, 'Production of charged pions, kaons and protons at large transverse momenta in pp and Pb–Pb collisions at√s_NN = 2.76 TeV', Physics Letters B, vol. 736, pp. 196-207. https://doi.org/10.1016/j.physletb.2014.07.011

TY - JOUR

T1 - Production of charged pions, kaons and protons at large transverse momenta in pp and Pb–Pb collisions at√sNN = 2.76 TeV

AU - ALICE Collaboration

AU - Barnby, Lee Stuart

AU - Alexandre, Didier

AU - Evans, David

AU - Hanratty, Luke

AU - Jones, Peter

AU - Jusko, Anton

AU - Krivda, Marian

AU - Lee, Graham

AU - Lietava, Roman

AU - Scott, Patrick

AU - Villalobos Baillie, Orlando

PY - 2014/9/7

Y1 - 2014/9/7

N2 - Transverse momentum spectra of π±, K± and p(p ̄) up to pT = 20 GeV/c at mid-rapidity in pp, peripheral (60–80%) and central (0–5%) Pb–Pb collisions at √sNN = 2.76 TeV have been measured using the ALICE detector at the Large Hadron Collider. The proton-to-pion and the kaon-to-pion ratios both show a distinct peak at pT ≈ 3 GeV/c in central Pb–Pb collisions. Below the peak, pT < 3 GeV/c, both ratios are in good agreement with hydrodynamical calculations, suggesting that the peak itself is dominantly the result of radial flow rather than anomalous hadronization processes. For pT > 10 GeV/c particle ratios in pp and 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.

AB - Transverse momentum spectra of π±, K± and p(p ̄) up to pT = 20 GeV/c at mid-rapidity in pp, peripheral (60–80%) and central (0–5%) Pb–Pb collisions at √sNN = 2.76 TeV have been measured using the ALICE detector at the Large Hadron Collider. The proton-to-pion and the kaon-to-pion ratios both show a distinct peak at pT ≈ 3 GeV/c in central Pb–Pb collisions. Below the peak, pT < 3 GeV/c, both ratios are in good agreement with hydrodynamical calculations, suggesting that the peak itself is dominantly the result of radial flow rather than anomalous hadronization processes. For pT > 10 GeV/c particle ratios in pp and 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.

KW - Identified particle production

KW - high-pt

KW - particle ratios

KW - baryon anomaly

KW - nuclear modification factor

KW - ALICE

KW - LHC

U2 - 10.1016/j.physletb.2014.07.011

DO - 10.1016/j.physletb.2014.07.011

M3 - Article

SN - 0370-2693

VL - 736

SP - 196

EP - 207

JO - Physics Letters B

JF - Physics Letters B

ER -

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

Abstract

Keywords

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Birmingham Nuclear Physics Consolidated Grant

Cite this

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