Journal
PHYSICAL REVIEW LETTERS
Volume 111, Issue 22, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.111.222301
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Funding
- State Committee of Science
- World Federation of Scientists (WFS)
- Swiss Fonds Kidagan
- Armenia
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq)
- Financiadora de Estudos e Projetos (FINEP)
- Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP)
- National Natural Science Foundation of China (NSFC)
- Chinese Ministry of Education (CMOE)
- Ministry of Science and Technology of China (MSTC)
- Ministry of Education and Youth of the Czech Republic
- Danish Natural Science Research Council
- Carlsberg Foundation
- Danish National Research Foundation
- European Research Council under the European Community
- Helsinki Institute of Physics
- Academy of Finland
- French CNRS-IN2P3
- CEA, France
- German BMBF
- Helmholtz AssociationGeneral Secretariat for Research and Technology, Ministry of Development, Greece
- Hungarian OTKA
- National Office for Research and Technology (NKTH)
- Department of Atomic Energy
- Department of Science and Technology of the Government of India
- Istituto Nazionale di Fisica Nucleare (INFN)
- Centro Fermi-Museo Storico della Fisica e Centro Studi e Ricerche Enrico Fermi, Italy
- MEXT, japan
- Joint Institute for Nuclear Research, Dubna
- National Research Foundation of Korea (NRF)
- CONACYT
- DGAPA
- ALFA-EC
- EPLANET Program (European Particle Physics Latin American Network)
- Stichting voor Fundamenteel Onderzoek der Materie (FOM)
- Nederlandse Organisatie voor Wetenschappelijk Onderzoek (NWO), Netherlands
- Research Council of Norway (NFR)
- Polish Ministry of Science and Higher Education
- National Authority for Scientific Research-NASR
- Ministry of Education and Science of Russian Federation
- Russian Academy of Sciences
- Russian Federal Agency of Atomic Energy
- Russian Federal Agency for Science and Innovations
- Russian Foundation for Basic Research
- Ministry of Education of Slovakia
- Department of Science and Technology, South Africa
- CIEMAT
- EELA
- Ministerio de Economia y Competitividad (MINECO) of Spain
- Xunta de Galicia (Conselleria de Educacion)
- CEADEN, Cubaenergia, Cuba
- IAEA (International Atomic Energy Agency)
- Swedish Research Council
- Knut and Alice Wallenberg Foundation (KAW)
- Ukraine Ministry of Education and Science
- United Kingdom Science and Technology Facilities Council (STFC)
- United States Department of Energy
- United States National Science Foundation
- State of Texas
- State of Ohio
- Grants-in-Aid for Scientific Research [23340074, 23244055, 25287048] Funding Source: KAKEN
- Division Of Physics
- Direct For Mathematical & Physical Scien [0968903, 1305280, 0969966] Funding Source: National Science Foundation
- Division Of Physics
- Direct For Mathematical & Physical Scien [1307461] Funding Source: National Science Foundation
- Science and Technology Facilities Council [ST/J000108/1] Funding Source: researchfish
- STFC [ST/J000094/1, ST/J000108/1, ST/J000140/1] Funding Source: UKRI
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The ALICE measurement of K-S(0) and Lambda production at midrapidity in Pb-Pb collisions at root sNN = 2.76 TeV is presented. The transverse momentum (p(T)) spectra are shown for several collision centrality intervals and in the p(T) range from 0: 4 GeV/c (0: 6 GeV/c for Lambda) to 12 GeV/c. The p(T) dependence of the Lambda/K-S(0) ratios exhibits maxima in the vicinity of 3 GeV/c, and the positions of the maxima shift towards higher p(T) 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 p(T) is not observed in pp interactions at root s = 0.9 TeV and at root s = 7 TeV. Qualitatively, the baryon enhancement in heavy-ion collisions is expected from radial flow. However, the measured p(T) spectra above 2 GeV/c progressively decouple from hydrodynamical-model calculations. For higher values of p(T), models that incorporate the influence of the medium on the fragmentation and hadronization processes describe qualitatively the p(T) dependence of the Lambda/K-S(0) ratio.
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