Y(3940) as a mixed charmonium-molecule state

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dc.contributor.authorAlbuquerque, R. M. [UNESP]
dc.contributor.authorDias, J. M.
dc.contributor.authorNielsen, M.
dc.contributor.authorZanetti, C. M.
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionUniversidade de São Paulo (USP)
dc.contributor.institutionUniversidade do Estado do Rio de Janeiro (UERJ)
dc.date.accessioned2014-12-03T13:11:19Z
dc.date.available2014-12-03T13:11:19Z
dc.date.issued2014-04-10
dc.description.abstractUsing the QCD sum rules approach, we study the mass and the decay widths of the Y(3940) state, assuming that it can be described by a mixed charmonium-molecule scalar state, i.e., a mixture between chi(c0) charmonium and D*(D) over bar* molecule. Using a current with J(PC) = 0(++), we estimate for the mixing angle, theta = (76.0+/-5.0)degrees, resulting in a mass value of M-Y = (3.95 +/- 0.11) GeV, which is in reasonable agreement with the experimental mass of the Y(3940) state. For the decay width, we evaluate the channels Y -> J/psi omega and Y -> gamma gamma. We find the values Gamma(Y -> J/psi omega) approximate to (1.7 +/- 0.6) MeV and Gamma(Y ->gamma gamma) approximate to (1.6 +/- 1.3) KeV, respectively. We also study the decay process of this state into channels containing D (D) over bar mesons in the final state. The result for the order of magnitude of the product Gamma(Y ->gamma gamma) X Gamma(Y -> J/psi omega) similar to O (10(3)) KeV(2) is also in reasonable agreement with the experimental data. We thus conclude that the present description of the Y(3940) as a mixed charmonium-molecule state is a possible scenario to explain the structure of such a state.en
dc.description.affiliationUniv Estadual Paulista, Inst Fis Teor, BR-01140070 Sao Paulo, Brazil
dc.description.affiliationUniv Sao Paulo, Inst Fis, BR-05389970 Sao Paulo, Brazil
dc.description.affiliationUniv Estado Rio de Janeiro, Fac Tecnol, BR-27537000 Resende, RJ, Brazil
dc.description.affiliationUnespUniv Estadual Paulista, Inst Fis Teor, BR-01140070 Sao Paulo, Brazil
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.format.extent9
dc.identifierhttp://dx.doi.org/10.1103/PhysRevD.89.076007
dc.identifier.citationPhysical Review D. College Pk: Amer Physical Soc, v. 89, n. 7, 9 p., 2014.
dc.identifier.doi10.1103/PhysRevD.89.076007
dc.identifier.fileWOS000334317700003.pdf
dc.identifier.issn1550-7998
dc.identifier.urihttp://hdl.handle.net/11449/113017
dc.identifier.wosWOS:000334317700003
dc.language.isoeng
dc.publisherAmer Physical Soc
dc.relation.ispartofPhysical Review D
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.titleY(3940) as a mixed charmonium-molecule stateen
dc.typeArtigo
dcterms.licensehttp://publish.aps.org/authors/transfer-of-copyright-agreement
dcterms.rightsHolderAmer Physical Soc
unesp.campusUniversidade Estadual Paulista (Unesp), Instituto de Física Teórica (IFT), São Paulopt

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