Measurement of event background fluctuations for charged particle jet reconstruction in 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 |
The effect of event background fluctuations on charged particle jet reconstruction in Pb-Pb collisions at root s(NN) = 2.76 TeV has been measured with the ALICE experiment. The main sources of non-statistical fluctuations are characterized based purely on experimental data with an unbiased method, as well as by using single high p(t) particles and simulated jets embedded into real Pb-Pb events and reconstructed with the anti-k(t) jet finder. The influence of a low transverse momentum cut-off on particles used in the jet reconstruction is quantified by varying the minimum track p(t) between 0.15 GeV/c and 2 GeV/c. For embedded jets reconstructed from charged particles with p(t) > 0.15 GeV/c, the uncertainty in the reconstructed jet transverse momentum due to the heavy-ion background is measured to be 11.3 GeV/c (standard deviation) for the 10% most central Pb-Pb collisions, slightly larger than the value of 11.0 GeV/c measured using the unbiased method. For a higher particle transverse momentum threshold of 2 GeV/c, which will generate a stronger bias towards hard fragmentation in the jet finding process, the standard deviation of the fluctuations in the reconstructed jet transverse momentum is reduced to 4.8-5.0 GeV/c for the 10% most central events. A non-Gaussian tail of the momentum uncertainty is observed and its impact on the reconstructed jet spectrum is evaluated for varying particle momentum thresholds, by folding the measured fluctuations with steeply falling spectra. 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 CNRS-IN2P3 French CNRSIN2P3 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 and Department of Science and Technology of the Government of India Department of Atomic Energy and 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, Japan MEXT, 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 (High-Energy physics Latin-American-European Network) HELEN (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, Russian Academy of Sciences International Science and Technology Center, 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 Department of Science and Technology, South Africa Department of Science and Technology, South Africa 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 CEADEN Cubaenergia, Cuba Cubaenergia, Cuba IAEA (International Atomic Energy Agency) IAEA (International Atomic Energy Agency) 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 |
JOURNAL OF HIGH ENERGY PHYSICS, NEW YORK, v. 47, n. 3, supl. 1, Part 6, pp. 1750-1756, MAR, 2012 1126-6708 http://www.producao.usp.br/handle/BDPI/43090 10.1007/JHEP03(2012)053 |
Idioma(s) |
eng |
Publicador |
SPRINGER NEW YORK |
Relação |
JOURNAL OF HIGH ENERGY PHYSICS |
Direitos |
closedAccess Copyright SPRINGER |
Palavras-Chave | #HEAVY IONS #QUARK-GLUON PLASMA #COLLABORATION #PERSPECTIVE #MATTER #STAR #PHYSICS, PARTICLES & FIELDS |
Tipo |
article original article publishedVersion |