K0S and Λ Production in Pb-Pb Collisions at √sNN = 2.76 TeV

ALICE Collaboration; B Abelev; Didier Alexandre; Lee Stuart Barnby; David Evans; Luke Hanratty; Peter Jones; Anton Jusko; Graham Lee; Roman Lietava; Arvinder Palaha; Plamen Petrov; Patrick Scott; Orlando Villalobos Baillie

doi:10.1103/PhysRevLett.111.222301

K⁰_S and Λ Production in Pb-Pb Collisions at √s_NN = 2.76 TeV

ALICE Collaboration, B Abelev, Didier Alexandre, Lee Stuart Barnby, David Evans, Luke Hanratty, Peter Jones, Anton Jusko, Graham Lee, Roman Lietava, Arvinder Palaha, Plamen Petrov, Patrick Scott, Orlando Villalobos Baillie

Physics and Astronomy

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Abstract

The ALICE measurement of K0S and Λ production at midrapidity in Pb-Pb collisions at √sNN =2.76 TeV is presented. The transverse momentum (pT) spectra are shown for several collision centrality intervals and in the pT range from 0.4 GeV/c (0.6 GeV/c for Λ) to 12 GeV/c. The pT dependence of the Λ/K0S ratios exhibits maxima in the vicinity of 3 GeV/c, and the positions of the maxima shift towards higher pT with increasing collision centrality. The magnitude of these maxima increases by almost a factor of three between most peripheral and most central Pb-Pb collisions. This baryon excess at intermediate pT is not observed in pp interactions at s√=0.9 TeV and at s√=7 TeV. Qualitatively, the baryon enhancement in heavy-ion collisions is expected from radial flow. However, the measured pT spectra above 2 GeV/c progressively decouple from hydrodynamical-model calculations. For higher values of pT, models that incorporate the influence of the medium on the fragmentation and hadronization processes describe qualitatively the pT dependence of the Λ/K0S ratio.

Original language	English
Article number	222301
Journal	Physical Review Letters
Volume	111
Issue number	22
Early online date	25 Nov 2013
DOIs	https://doi.org/10.1103/PhysRevLett.111.222301
Publication status	Published - 27 Nov 2013

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K0S and Lambda Production (Physical Review Letters)
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Final published version, 339 KBLicence: Creative Commons: Attribution (CC BY)

http://journals.aps.org/prl/abstract/10.1103/PhysRevLett.111.222301

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

@article{03c7611566474b9ea51dae33695f5b94,

title = "K0S and Λ Production in Pb-Pb Collisions at √sNN = 2.76 TeV",

abstract = "The ALICE measurement of K0S and Λ production at midrapidity in Pb-Pb collisions at √sNN =2.76 TeV is presented. The transverse momentum (pT) spectra are shown for several collision centrality intervals and in the pT range from 0.4 GeV/c (0.6 GeV/c for Λ) to 12 GeV/c. The pT dependence of the Λ/K0S ratios exhibits maxima in the vicinity of 3 GeV/c, and the positions of the maxima shift towards higher pT with increasing collision centrality. The magnitude of these maxima increases by almost a factor of three between most peripheral and most central Pb-Pb collisions. This baryon excess at intermediate pT is not observed in pp interactions at s√=0.9 TeV and at s√=7 TeV. Qualitatively, the baryon enhancement in heavy-ion collisions is expected from radial flow. However, the measured pT spectra above 2 GeV/c progressively decouple from hydrodynamical-model calculations. For higher values of pT, models that incorporate the influence of the medium on the fragmentation and hadronization processes describe qualitatively the pT dependence of the Λ/K0S ratio.",

author = "{ALICE Collaboration} and B Abelev and Didier Alexandre and Barnby, {Lee Stuart} and David Evans and Luke Hanratty and Peter Jones and Anton Jusko and Graham Lee and Roman Lietava and Arvinder Palaha and Plamen Petrov and Patrick Scott and {Villalobos Baillie}, Orlando",

year = "2013",

month = nov,

day = "27",

doi = "10.1103/PhysRevLett.111.222301",

language = "English",

volume = "111",

journal = "Physical Review Letters",

issn = "0031-9007",

publisher = "American Physical Society (APS)",

number = "22",

}

TY - JOUR

T1 - K0S and Λ Production in Pb-Pb Collisions at √sNN = 2.76 TeV

AU - ALICE Collaboration

AU - Abelev, B

AU - Alexandre, Didier

AU - Barnby, Lee Stuart

AU - Evans, David

AU - Hanratty, Luke

AU - Jones, Peter

AU - Jusko, Anton

AU - Lee, Graham

AU - Lietava, Roman

AU - Palaha, Arvinder

AU - Petrov, Plamen

AU - Scott, Patrick

AU - Villalobos Baillie, Orlando

PY - 2013/11/27

Y1 - 2013/11/27

N2 - The ALICE measurement of K0S and Λ production at midrapidity in Pb-Pb collisions at √sNN =2.76 TeV is presented. The transverse momentum (pT) spectra are shown for several collision centrality intervals and in the pT range from 0.4 GeV/c (0.6 GeV/c for Λ) to 12 GeV/c. The pT dependence of the Λ/K0S ratios exhibits maxima in the vicinity of 3 GeV/c, and the positions of the maxima shift towards higher pT with increasing collision centrality. The magnitude of these maxima increases by almost a factor of three between most peripheral and most central Pb-Pb collisions. This baryon excess at intermediate pT is not observed in pp interactions at s√=0.9 TeV and at s√=7 TeV. Qualitatively, the baryon enhancement in heavy-ion collisions is expected from radial flow. However, the measured pT spectra above 2 GeV/c progressively decouple from hydrodynamical-model calculations. For higher values of pT, models that incorporate the influence of the medium on the fragmentation and hadronization processes describe qualitatively the pT dependence of the Λ/K0S ratio.

AB - The ALICE measurement of K0S and Λ production at midrapidity in Pb-Pb collisions at √sNN =2.76 TeV is presented. The transverse momentum (pT) spectra are shown for several collision centrality intervals and in the pT range from 0.4 GeV/c (0.6 GeV/c for Λ) to 12 GeV/c. The pT dependence of the Λ/K0S ratios exhibits maxima in the vicinity of 3 GeV/c, and the positions of the maxima shift towards higher pT with increasing collision centrality. The magnitude of these maxima increases by almost a factor of three between most peripheral and most central Pb-Pb collisions. This baryon excess at intermediate pT is not observed in pp interactions at s√=0.9 TeV and at s√=7 TeV. Qualitatively, the baryon enhancement in heavy-ion collisions is expected from radial flow. However, the measured pT spectra above 2 GeV/c progressively decouple from hydrodynamical-model calculations. For higher values of pT, models that incorporate the influence of the medium on the fragmentation and hadronization processes describe qualitatively the pT dependence of the Λ/K0S ratio.

U2 - 10.1103/PhysRevLett.111.222301

DO - 10.1103/PhysRevLett.111.222301

M3 - Article

SN - 0031-9007

VL - 111

JO - Physical Review Letters

JF - Physical Review Letters

IS - 22

M1 - 222301

ER -

K0S and Λ Production in Pb-Pb Collisions at √sNN = 2.76 TeV

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Birmingham Nuclear Physics Consolidated Grant

Cite this

K⁰_S and Λ Production in Pb-Pb Collisions at √s_NN = 2.76 TeV