Measurement of the prompt J/psi and psi(2S) polarizations in pp collisions at root s=7 TeV
Contribuinte(s) |
Universidade Estadual Paulista (UNESP) |
---|---|
Data(s) |
03/12/2014
03/12/2014
18/12/2013
|
Resumo |
Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) The polarizations of prompt J/psi and psi(2S) mesons are measured in proton-proton collisions at root s = 7 TeV, using a dimuon data sample collected by the CMS experiment at the LHC, corresponding to an integrated luminosity of 4.9 fb(-1). The prompt J/psi and psi(2S) polarization parameters lambda, lambda, and lambda, as well as the frame-invariant quantity (lambda) over bar. are measured from the dimuon decay angular distributions in three different polarization frames. The J/psi results are obtained in the transverse momentum range 14 < P-T < 70 GeV, in the rapidity intervals |y| < 0.6 and 0.6 < |y| < 1.2. The corresponding psi(2S) results cover 14 < PT < 50 GeV and include a third rapidity bin, 1.2 < |y| < 1.5. No evidence of large polarizations is seen in these kinematic regions, which extend much beyond those previously explored. (C) 2013 CERN. Published by Elsevier B.V. All rights reserved. |
Formato |
381-402 |
Identificador |
http://dx.doi.org/10.1016/j.physletb.2013.10.055 Physics Letters B. Amsterdam: Elsevier Science Bv, v. 727, n. 4-5, p. 381-402, 2013. 0370-2693 http://hdl.handle.net/11449/111332 10.1016/j.physletb.2013.10.055 WOS:000328722500006 WOS000328722500006.pdf |
Idioma(s) |
eng |
Publicador |
Elsevier B.V. |
Relação |
Physics Letters B |
Direitos |
openAccess |
Palavras-Chave | #CMS #Physics #Quarkonium production #Quarkonium polarization |
Tipo |
info:eu-repo/semantics/article |