Dilepton mass spectra in p plus p collisions at root s=200 GeV
Contribuinte(s) |
UNIVERSIDADE DE SÃO PAULO |
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Data(s) |
20/10/2012
20/10/2012
2009
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Resumo |
PHENIX has measured the electron-positron pair mass spectrum from 0 to 8 GeV/c(2) in p + p collisions at root s = 200 GeV. The contributions from light meson decays to e(+)e(-) pairs have been determined based on measurements of hadron production cross sections by PHENIX. Within the systematic uncertainty of similar to 20% they account for all e(+)e(-) pairs in the mass region below similar to 1 GeV/c(2). The e(+)e(-) pair yield remaining after subtracting these contributions is dominated by semileptonic decays of charmed hadrons correlated through flavor conservation. Using the spectral shape predicted by PYTHIA, we estimate the charm production cross section to be 544 +/- 39(stat) +/- 142(syst) +/- 200(model) pb. which is consistent with QCD calculations and measurements of single leptons by PHENIX. (C) 2008 Elsevier BV. All rights reserved. U.S. Department of Energy (DOE) Department of Energy (DOE), USA NSF (USA) U.S. National Science Foundation (NSF) MEXT (Japan) MEXT (Japan) Japan Society for the Promotion of Science (JSPS) JSPS (Japan) CNPq (Brazil) Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) FAPESP (Brazil) Natural Science Foundation of China (NSFC) NSFC Natural Science Foundation (China) IN2P3/CNRS (France) IN2P3/CNRS (France) CEA (France) Commissariat à l énergie atomique et aux énergies alternatives (CEA) Bundesministeriums für Bildung und Forschung (BMBF) BMBF (Germany) Deutscher Akademischer Austauschdienst (DAAD) DAAD (Germany) Alexander von Humboldt Foundation - AvH (Germany) Alexander von Humboldt Foundation (AvH) Országos Tudományos Kutatási Alapprogramok (OTKA) OTKA (Hungary) DAE (India) Department of Atomic Energy of India (DAE) ISF (Israel) ISF (Israel) KRF (Korea) KRF (Korea) KOSEF (Korea) KOSEF (Korea) MES (Russia) MES (Russia) RAS (Russia) RAS (Russia) FAAE (Russia) FAAE (Russia) VR (Sweden) VR (Sweden) KAW (Sweden) KAW (Sweden) US CRDF US CRDF US-Hungarian NSF-OTKA-MTA US-Hungarian NSF-OTKA-MTA US-Israel BSF US-Israel BSF |
Identificador |
PHYSICS LETTERS B, v.670, n.4/Mai, p.313-320, 2009 0370-2693 http://producao.usp.br/handle/BDPI/29233 10.1016/j.physletb.2008.10.064 |
Idioma(s) |
eng |
Publicador |
ELSEVIER SCIENCE BV |
Relação |
Physics Letters B |
Direitos |
restrictedAccess Copyright ELSEVIER SCIENCE BV |
Palavras-Chave | #PAIR PRODUCTION #PHENIX #MESONS #DECAYS #Physics, Multidisciplinary |
Tipo |
article original article publishedVersion |