Cross section and double helicity asymmetry for eta mesons and their comparison to pi(0) production in p plus p collisions at root s=200 GeV
Contribuinte(s) |
UNIVERSIDADE DE SÃO PAULO |
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Data(s) |
18/04/2012
18/04/2012
2011
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Resumo |
Measurements of double-helicity asymmetries in inclusive hadron production in polarized p + p collisions are sensitive to helicity-dependent parton distribution functions, in particular, to the gluon helicity distribution, Delta g. This study focuses on the extraction of the double-helicity asymmetry in eta production ((p) over right arrow + (p) over right arrow -> eta + X), the eta cross section, and the eta/pi(0) cross section ratio. The cross section and ratio measurements provide essential input for the extraction of fragmentation functions that are needed to access the helicity-dependent parton distribution functions. Office of Nuclear Physics in the Office of Science of the Department of Energy (DOE) National Science Foundation (NSF) Renaissance Technologies LLC Abilene Christian University Research Council Research Foundation of SUNY College of Arts and Sciences, Vanderbilt University (U.S.) Ministry of Education, Culture, Sports, Science, and Technology (MEXT), Japan JSPS - Japan Society for the Promotion of Science (Japan) Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq) and Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP) (Brazil) NSFC Natural Science Foundation of China (People's Republic of China) MSMT Ministry of Education, Youth and Sports (Czech Republic) Centre National de la Recherche Scientifique - CNRS CEA Commissariat a l'Energie Atomique (CNRS/IN2P3) Institut National de Physique Nucleaire et de Physique des Particules (France) Ministry of Industry, Science, and Tekhnologies BMBF - Bundesministerium fur Bildung und Forschung, Germany (DAAD) Deutscher Akademischer Austausch Dienst, Germany Alexander von Humboldt Stiftung (Germany) Hungarian National Science Fund, OTKA (Hungary) (DAE) Department of Atomic Energy, India ISF - Israel Science Foundation (Israel) National Research Foundation (NRF), Korea Ministry Education Science and Technology (MEST), Korea MES Ministry of Education and Science, Russia Academy of Sciences FAAE Federal Agency of Atomic Energy (Russia), V R Wallenberg Foundation (Sweden) CRDF U. S. Civilian Research and Development Foundation for the Independent States of the Former Soviet Union U.S.-Hungarian Fulbright Foundation for Educational Exchange (BSF) U.S.-Israel Binational Science Foundation |
Identificador |
PHYSICAL REVIEW D, v.83, n.3, 2011 1550-7998 http://producao.usp.br/handle/BDPI/16060 10.1103/PhysRevD.83.032001 |
Idioma(s) |
eng |
Publicador |
AMER PHYSICAL SOC |
Relação |
Physical Review D |
Direitos |
restrictedAccess Copyright AMER PHYSICAL SOC |
Palavras-Chave | #DEEP-INELASTIC SCATTERING #DEUTERON #DISTRIBUTIONS #PHYSICS #PROTON #Astronomy & Astrophysics #Physics, Particles & Fields |
Tipo |
article original article publishedVersion |