Forward Neutral-Pion Transverse Single-Spin Asymmetries 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
2008
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Resumo |
We report precision measurements of the Feynman x (x(F)) dependence, and first measurements of the transverse momentum (p(T)) dependence, of transverse single-spin asymmetries for the production of pi(0) mesons from polarized proton collisions at s=200 GeV. The x(F) dependence of the results is in fair agreement with perturbative QCD model calculations that identify orbital motion of quarks and gluons within the proton as the origin of the spin effects. Results for the p(T) dependence at fixed x(F) are not consistent with these same perturbative QCD-based calculations. U. S. DOE Office of Science U. S. NSF National Science Foundation Renaissance Technologies Corporation BMBF - Bundesministerium fur Bildung und Forschung, Germany Centre National de la Recherche Scientifique - CNRS/IN2P3 EMN of France EPSRC of the United Kingdom FAPESP of Brazil MES Russian Ministry of Science and Technology Ministry of Education (MoE) and the NSFC of China Polish State Committee for Scientific Research Slovak Research and Development Agency Korea Science and Engineering Foundation (KOSEF) |
Identificador |
PHYSICAL REVIEW LETTERS, NEW YORK, v.101, 25 NOV, 2008 0031-9007 http://producao.usp.br/handle/BDPI/15011 10.1103/PhysRevLett.101.222001 |
Idioma(s) |
eng |
Publicador |
AMER PHYSICAL SOC NEW YORK |
Relação |
Physical Review Letters |
Direitos |
restrictedAccess Copyright AMER PHYSICAL SOC |
Palavras-Chave | #POLARIZED PROTON-BEAM #HIGH CHI-F #ANALYZING-POWER #INCLUSIVE PRODUCTION #HARD-SCATTERING #PI-0 PRODUCTION #GEV-C #ANTIPROTONS #Physics, Multidisciplinary |
Tipo |
article original article publishedVersion |