SEARCH FOR POINT-LIKE SOURCES OF ULTRA-HIGH ENERGY NEUTRINOS AT THE PIERRE AUGER OBSERVATORY AND IMPROVED LIMIT ON THE DIFFUSE FLUX OF TAU NEUTRINOS
Contribuinte(s) |
UNIVERSIDADE DE SÃO PAULO |
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Data(s) |
25/09/2013
25/09/2013
2012
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Resumo |
The surface detector array of the Pierre Auger Observatory can detect neutrinos with energy E-nu between 10(17) eV and 10(20) eV from point-like sources across the sky south of +55 degrees and north of -65 degrees declinations. A search has been performed for highly inclined extensive air showers produced by the interaction of neutrinos of all flavors in the atmosphere (downward-going neutrinos), and by the decay of tau leptons originating from tau neutrino interactions in Earth's crust (Earth-skimming neutrinos). No candidate neutrinos have been found in data up to 2010 May 31. This corresponds to an equivalent exposure of similar to 3.5 years of a full surface detector array for the Earth-skimming channel and similar to 2 years for the downward-going channel. An improved upper limit on the diffuse flux of tau neutrinos has been derived. Upper limits on the neutrino flux from point-like sources have been derived as a function of the source declination. Assuming a differential neutrino flux k(PS) . E-nu(-2). from a point-like source, 90% confidence level upper limits for k(PS) at the level of approximate to 5x10(-7) and 2.5x10(-6) GeV cm(-2) s(-1) have been obtained over a broad range of declinations from the searches for Earth-skimming and downward-going neutrinos, respectively. Comision Nacional de Energia Atomica, Argentina Fundacion Antorchas, Argentina Gobierno De La Provincia de Mendoza, Argentina Municipalidad de Malargue, Argentina NDM Holdings, Argentina Valle Las Lenas, Argentina Australian Research Council Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq), Brazil Financiadora de Estudos e Projetos (FINEP), Brazil Fundacao de Amparo a Pesquisa do Estado de Rio de Janeiro (FAPERJ), Brazil Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP), Brazil Ministerio de Ciencia e Tecnologia (MCT), Brazil AVCR, Czech Republic [AV0Z10100502, AV0Z10100522] GAAV, Czech Republic [KJB100100904, MSMT-CRLA08016, LG11044, MEB111003, MSM0021620859, LA08015] TACR, Czech Republic [TA01010517] Centre de Calcul IN2P3/CNRS, France Centre National de la Recherche Scientifique (CNRS), France Conseil Regional Ile-de-France, France Departement Physique Nucleaire et Corpusculaire (PNCIN2P3/CNRS), France Departement Sciences de l'Univers (SDU-INSU/CNRS), France Bundesministerium fur Bildung und Forschung (BMBF), Germany Deutsche Forschungsgemeinschaft (DFG), Germany Finanzministerium Baden-Wurttemberg, Germany Helmholtz-Gemeinschaft Deutscher Forschungszentren (HGF), Germany Ministerium fur Wissenschaft und Forschung, Nordrhein-Westfalen, Germany Ministerium fur Wissenschaft, Forschung und Kunst, Baden-Wurttemberg, Germany Istituto Nazionale di Fisica Nucleare (INFN), Italy Ministero dell'Istruzione, dell'Universita e della Ricerca (MIUR), Italy Consejo Nacional de Ciencia y Tecnologia (CONACYT), Mexico Ministerie van Onderwijs, Cultuur en Wetenschap, Netherlands Nederlandse Organisatie voor Wetenschappelijk Onderzoek (NWO), Netherlands Stichting voor Fundamenteel Onderzoek der Materie (FOM), Netherlands Ministry of Science and Higher Education, Poland [N N202 200239, N N202 207238] Fundacao para a Ciencia e a Tecnologia, Portugal Ministry for Higher Education, Science, and Technology, Slovenian Research Agency, Slovenia Comunidad de Madrid, Consejeria de Educacion de la Comunidad de Castilla La Mancha, Spain FEDER, Spain Ministerio de Ciencia e Innovacion, Spain ConsoliderIngenio (CPAN), Xunta de Galicia, Spain Science and Technology Facilities Council, United Kingdom Department of Energy [DE-AC02-07CH11359, DE-FR02-04ER41300] National Science Foundation [0450696] Grainger Foundation USA NAFOSTED, Vietnam ALFA-EC/HELEN UNESCO |
Identificador |
ASTROPHYSICAL JOURNAL LETTERS, BRISTOL, v. 755, n. 1, pp. 649-651, AUG 10, 2012 2041-8205 http://www.producao.usp.br/handle/BDPI/33714 10.1088/2041-8205/755/1/L4 |
Idioma(s) |
eng |
Publicador |
IOP PUBLISHING LTD BRISTOL |
Relação |
ASTROPHYSICAL JOURNAL LETTERS |
Direitos |
closedAccess Copyright IOP PUBLISHING LTD |
Palavras-Chave | #ASTROPARTICLE PHYSICS #COSMIC RAYS #NEUTRINOS #TELESCOPES #COSMIC-RAYS #DETECTOR #ASTRONOMY & ASTROPHYSICS |
Tipo |
article original article publishedVersion |