Pion, Kaon, and Proton Production in Central Pb-Pb Collisions at root s(NN)=2.76 TeV
Contribuinte(s) |
UNIVERSIDADE DE SÃO PAULO |
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Data(s) |
07/11/2013
07/11/2013
2012
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Resumo |
In this Letter we report the first results on pi(+/-), K-+/-, p, and (p) over bar production at midrapidity (vertical bar y vertical bar < 0.5) in central Pb-Pb collisions at root s(NN) = 2.76 TeV, measured by the ALICE experiment at the LHC. The p(T) distributions and yields are compared to previous results at root s(NN) = 200 GeV and expectations from hydrodynamic and thermal models. The spectral shapes indicate a strong increase of the radial flow velocity with root s(NN), which in hydrodynamic models is expected as a consequence of the increasing particle density. While the K/pi ratio is in line with predictions from the thermal model, the p/pi ratio is found to be lower by a factor of about 1.5. This deviation from thermal model expectations is still to be understood. Calouste Gulbenkian Foundation from Lisbon and Swiss Fonds Kidagan, Armenia Calouste Gulbenkian Foundation from Lisbon and Swiss Fonds Kidagan, Armenia Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq) Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq) Financiadora de Estudos e Projetos (FINEP) Financiadora de Estudos e Projetos (FINEP) Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP) Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP) National Natural Science Foundation of China (NSFC) National Natural Science Foundation of China (NSFC) Chinese Ministry of Education (CMOE) Chinese Ministry of Education (CMOE) Ministry of Science and Technology of China (MSTC) Ministry of Science and Technology of China (MSTC) Ministry of Education and Youth of the Czech Republic Ministry of Education and Youth of the Czech Republic Danish Natural Science Research Council Danish Natural Science Research Council Carlsberg Foundation Carlsberg Foundation Danish National Research Foundation Danish National Research Foundation European Research Council under the European Community European Research Council under the European Community Helsinki Institute of Physics Helsinki Institute of Physics Academy of Finland Academy of Finland French CNRSIN2P3 French CNRS-IN2P3 Region Pays de Loire Region Pays de Loire Region Alsace Region Alsace Region Auvergne Region Auvergne CEA, France CEA, France German BMBF German BMBF Helmholtz Association Helmholtz Association General Secretariat for Research and Technology, Ministry of Development, Greece General Secretariat for Research and Technology, Ministry of Development, Greece Hungarian OTKA Hungarian OTKA National Office for Research and Technology (NKTH) National Office for Research and Technology (NKTH) Department of Atomic Energy Department of Atomic Energy Department of Science and Technology of the Government of India Department of Science and Technology of the Government of India Istituto Nazionale di Fisica Nucleare (INFN) of Italy Istituto Nazionale di Fisica Nucleare (INFN) of Italy MEXT GrantinAid for Specially Promoted Research, Japan MEXT Grant-in-Aid for Specially Promoted Research, Japan Joint Institute for Nuclear Research, Dubna Joint Institute for Nuclear Research, Dubna National Research Foundation of Korea (NRF) National Research Foundation of Korea (NRF) CONACYT CONACYT DGAPA, Mexico DGAPA, Mexico ALFAEC ALFA-EC HELEN Program (High-Energy physics Latin-American-European Network) HELEN Program (HighEnergy physics LatinAmericanEuropean Network) Stichting voor Fundamenteel Onderzoek der Materie (FOM) Stichting voor Fundamenteel Onderzoek der Materie (FOM) Nederlandse Organisatie voor Wetenschappelijk Onderzoek (NWO), Netherlands Nederlandse Organisatie voor Wetenschappelijk Onderzoek (NWO), Netherlands Research Council of Norway (NFR) Research Council of Norway (NFR) Polish Ministry of Science and Higher Education Polish Ministry of Science and Higher Education National Authority for Scientific Research NASR (Autoritatea Nationala pentru Cercetare Stiintifica ANCS) National Authority for Scientific Research-NASR (Autoritatea Nationala pentru Cercetare Stiintifica-ANCS) Federal Agency of Science of the Ministry of Education and Science of Russian Federation Federal Agency of Science of the Ministry of Education and Science of Russian Federation International Science and Technology Center International Science and Technology Center Russian Academy of Sciences Russian Academy of Sciences Russian Federal Agency of Atomic Energy Russian Federal Agency of Atomic Energy Russian Federal Agency for Science and Innovations Russian Federal Agency for Science and Innovations CERNINTAS CERN-INTAS Ministry of Education of Slovakia Ministry of Education of Slovakia CIEMAT CIEMAT EELA EELA Ministerio de Educacion y Ciencia of Spain Ministerio de Educacion y Ciencia of Spain Xunta de Galicia (Conselleria de Educacion) Xunta de Galicia (Conselleria de Educacion) CEADEN, Cubaenergia, Cuba CEADEN, Cubaenergia, Cuba IAEA (International Atomic Energy Agency) IAEA (International Atomic Energy Agency) Ministry of Science and Technology and the National Research Foundation (NRF), South Africa Ministry of Science and Technology and the National Research Foundation (NRF), South Africa Swedish Reseach Council (VR) Swedish Reseach Council (VR) Knut & Alice Wallenberg Foundation (KAW) Knut & Alice Wallenberg Foundation (KAW) Ukraine Ministry of Education and Science Ukraine Ministry of Education and Science United Kingdom Science and Technology Facilities Council (STFC) United Kingdom Science and Technology Facilities Council (STFC) United States Department of Energy United States Department of Energy United States National Science Foundation United States National Science Foundation State of Texas State of Texas State of Ohio State of Ohio |
Identificador |
PHYSICAL REVIEW LETTERS, COLLEGE PK, v. 109, n. 25, supl. 1, Part 1, pp. 10903-10906, DEC 18, 2012 0031-9007 http://www.producao.usp.br/handle/BDPI/42796 10.1103/PhysRevLett.109.252301 |
Idioma(s) |
eng |
Publicador |
AMER PHYSICAL SOC COLLEGE PK |
Relação |
PHYSICAL REVIEW LETTERS |
Direitos |
openAccess Copyright AMER PHYSICAL SOC |
Palavras-Chave | #HEAVY-ION COLLISIONS #QCD PHASE-TRANSITION #TOTAL CROSS-SECTIONS #CHEMICAL FREEZE-OUT #QUARK-GLUON PLASMA #FINITE-TEMPERATURE #HADRON-PRODUCTION #MONTE-CARLO #SPECTRUM #MODELS #PHYSICS, MULTIDISCIPLINARY |
Tipo |
article original article publishedVersion |