(3)(Lambda)Hand (3)((Lambda)over-bar)(H)over-bar production in Pb-Pb collisions at root s(NN)=2.76 TeV
ALICE Collaboration (ukupan broj autora: 982)
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The production of the hypertriton nuclei H-3(Lambda) and (3)((Lambda) over bar)(H) over bar has been measured for the first time in Pb-Pb collisions at root s(NN) = 2.76 TeVwith the ALICE experiment at LHC. The p(T)-integrated H-3(Lambda) yield in one unity of rapidity, dN/dy x B.R.((3 Lambda H - GT 3He,pi-)) = (3.86 +/- 0.77(stat.) +/- 0.68(syst.)) x 10(-5) in the 0-10% most central collisions, is consistent with the predictions from a statistical thermal model using the same temperature as for the light hadrons. The coalescence parameter B-3 shows a dependence on the transverse momentum, similar to the B-2 of deuterons and the B-3 of He-3 nuclei. The ratio of yields S-3 = H-3(Lambda)/(He-3 x Lambda/p) was measured to be S-3 = 0.60 +/- 0.13(stat.) +/- 0.21(syst.) in 0-10% centrality events; this value is compared to different theoretical models. The measured S-3 is compatible with thermal model predictions. The measured H-3(Lambda) lifetime, tau = 181(-39)(+54)(stat.) +/- 33(syst.) ps...is in agreement within 1s with the world average value. (C) 2016 CERN for the benefit of the ALICE Collaboration. Published by Elsevier B.V.
Izvor:Physics Letters B, 2016, 754, 360-372
- State Committee of Science, Armenia, World Federation of Scientists (WFS), Armenia, 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 Communitys Seventh Framework Programme, Helsinki Institute of Physics, Academy of Finland, French CNRS-IN2P3, France, Region Pays de Loire, France, Region Alsace, France, Region Auvergne, France, CEA, France, German Bundesministerium fur Bildung, Wissenschaft, Forschung und Technologie (BMBF), Helmholtz Association, General Secretariat for Research and Technology, Ministry of Development, Greece, Hungarian Orszagos Tudomanyos Kutatasi Alappgrammok (OTKA), National Office for Research and Technology (NKTH), Department of Atomic Energy and Department of Science and Technology of the Government of India, Istituto Nazionale di Fisica Nucleare (INFN), Italy, 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), Consejo Nacional de Cienca y Tecnologia (CONACYT), Mexico, Direccion General de Asuntos del Personal Academico (DGAPA), Mexico, Amerique Latine Formation academique - European Commission (ALFA-EC), EPLANET Program (European Particle Physics Latin American Network), Stichting voor Fundamenteel Onderzoek der Materie (FOM), Netherlands, Nederlandse Organisatie voor Wetenschappelijk Onderzoek (NWO), Netherlands, Research Council of Norway (NFR), National Science Centre, Poland, Ministry of National Education/Institute for Atomic Physics, Romania, National Council of Scientific Research in Higher Education (CNCSI-UEFISCDI), Romania, Ministry of Education and Science of the 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, Republic of South Africa, South Africa, Centro de Investigaciones Energeticas, Medioambientales y Tecnologicas (CIEMAT), Ministerio de Economia y Competitividad (MINECO) of Spain, Xunta de Galicia (Conselleria de Educacion), Centro de Aplicaciones Tecnologicas y Desarrollo Nuclear (CEADEN), Cubaenergia, Cuba, IAEA (International Atomic Energy Agency), Swedish Research Council (VR), 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, Ministry of Science, Education and Sports of Croatia, Unity through Knowledge Fund, Croatia, Council of Scientific and Industrial Research (CSIR), New Delhi, India