Measurement of Bottom Versus Charm as a Function of Transverse Momentum with Electron-Hadron Correlations in p plus p Collisions at s=200 GeV
Contribuinte(s) |
UNIVERSIDADE DE SÃO PAULO |
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Data(s) |
18/04/2012
18/04/2012
2009
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Resumo |
The momentum distribution of electrons from semileptonic decays of charm and bottom quarks for midrapidity |y|< 0.35 in p+p collisions at s=200 GeV is measured by the PHENIX experiment at the Relativistic Heavy Ion Collider over the transverse momentum range 2 < p(T)< 7 GeV/c. The ratio of the yield of electrons from bottom to that from charm is presented. The ratio is determined using partial D/D -> e(+/-)K(-/+)X (K unidentified) reconstruction. It is found that the yield of electrons from bottom becomes significant above 4 GeV/c in p(T). A fixed-order-plus-next-to-leading-log perturbative quantum chromodynamics calculation agrees with the data within the theoretical and experimental uncertainties. The extracted total bottom production cross section at this energy is sigma(bb)=3.2(-1.1)(+1.2)(stat)(-1.3)(+1.4)(syst)mu b. DOE Office of Science, U.S. NSF National Science Foundation Renaissance Technologies (USA) MEXT and JSPS (Japan) CNPq and FAPESP (Brazil) NSFC (China) MSMT (Czech Republic) Centre National de la Recherche Scientifique - IN2P3/CNRS CEA (France) BMBF - Bundesministerium fur Bildung und Forschung, Germany (DAAD) Deutscher Akademischer Austausch Dienst, Germany Alexander von Humboldt Foundation (Germany) OTKA (Hungary) (DAE) Department of Atomic Energy, India ISF - Israel Science Foundation (Israel) KRF and KOSEF (Korea) MES Ministry of Education and Science of the Russian Federation, RAS Russia Academy of Sciences, and FAAE (Russia) VR and KAW (Sweden) U.S. CRDF US-Hungary Fulbright (BSF) US-Israel Binational Science Foundation |
Identificador |
PHYSICAL REVIEW LETTERS, v.103, n.8, 2009 0031-9007 http://producao.usp.br/handle/BDPI/16092 10.1103/PhysRevLett.103.082002 |
Idioma(s) |
eng |
Publicador |
AMER PHYSICAL SOC |
Relação |
Physical Review Letters |
Direitos |
restrictedAccess Copyright AMER PHYSICAL SOC |
Palavras-Chave | #PHYSICS #Physics, Multidisciplinary |
Tipo |
article original article publishedVersion |