Kinematical and nonlocality effects on the nonmesonic weak hypernuclear decay

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dc.contributor.authorBarbero, C.
dc.contributor.authorDe Conti, C.
dc.contributor.authorGaleao, A. P.
dc.contributor.authorKrmpotic, F.
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionInstituto Tecnológico de Aeronáutica (ITA)
dc.contributor.institutionNatl Univ La Plata
dc.contributor.institutionUniversidade de São Paulo (USP)
dc.date.accessioned2014-05-20T14:08:11Z
dc.date.available2014-05-20T14:08:11Z
dc.date.issued2003-10-20
dc.description.abstractWe make a careful study about the nonrelativistic reduction of one-meson-exchange models for the nonmesonic weak hypernuclear decay. Starting from a widely accepted effective coupling Hamiltonian involving the exchange of the complete pseudoscalar and vector meson octets (pi, eta, K, rho, omega, K*), the strangeness-changing weak LambdaN --> NN transition potential is derived, including two effects that have been systematically omitted in the literature, or, at best, only partly considered. These are the kinematical effects due to the difference between the lambda and nucleon masses, and the first-order nonlocality corrections, i.e., those involving up to first-order differential operators. Our analysis clearly shows that the main kinematical effect on the local contributions is the reduction of the effective pion mass. The kinematical effect on the nonlocal contributions is more complicated, since it activates several new terms that would otherwise remain dormant. Numerical results for C-12(Lambda) and He-5(Lambda) are presented and they show that the combined kinematical plus nonlocal corrections have an appreciable influence on the partial decay rates. However, this is somewhat diminished in the main decay observables: the total nonmesonic rate, Gamma(nm), the neutron-to-proton branching ratio, Gamma(n)/Gamma(p), and the asymmetry parameter, a(Lambda). The latter two still cannot be reconciled with the available experimental data. The existing theoretical predictions for the sign of a(Lambda) in He-5(Lambda) are confirmed. (C) 2003 Elsevier B.V. All rights reserved.en
dc.description.affiliationUniv Estadual Paulista, Inst Fis Teor, BR-01405900 São Paulo, Brazil
dc.description.affiliationInst Tecnol Aeronaut, Ctr Tecn Aeroespacial, BR-12228900 Sao Jose Dos Campos, SP, Brazil
dc.description.affiliationNatl Univ La Plata, Dept Fis, RA-1900 La Plata, Argentina
dc.description.affiliationUniv São Paulo, Inst Fis, BR-05315970 São Paulo, Brazil
dc.description.affiliationUnespUniv Estadual Paulista, Inst Fis Teor, BR-01405900 São Paulo, Brazil
dc.format.extent267-302
dc.identifierhttp://dx.doi.org/10.1016/S0375-9474(03)01620-8
dc.identifier.citationNuclear Physics A. Amsterdam: Elsevier B.V., v. 726, n. 3-4, p. 267-302, 2003.
dc.identifier.doi10.1016/S0375-9474(03)01620-8
dc.identifier.issn0375-9474
dc.identifier.lattes2914838355690793
dc.identifier.orcid0000-0002-3024-2671
dc.identifier.urihttp://hdl.handle.net/11449/23919
dc.identifier.wosWOS:000185436200005
dc.language.isoeng
dc.publisherElsevier B.V.
dc.relation.ispartofNuclear Physics A
dc.relation.ispartofjcr1.992
dc.relation.ispartofsjr0,938
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.subjecthypernucleipt
dc.subjectnonmesonic decaypt
dc.subjectone-meson-exchange modelpt
dc.titleKinematical and nonlocality effects on the nonmesonic weak hypernuclear decayen
dc.typeArtigo
dcterms.licensehttp://www.elsevier.com/about/open-access/open-access-policies/article-posting-policy
dcterms.rightsHolderElsevier B.V.
unesp.author.lattes3161960405091076[3]
unesp.author.lattes2914838355690793[2]
unesp.author.orcid0000-0002-3024-2671[2]
unesp.campusUniversidade Estadual Paulista (Unesp), Instituto de Física Teórica (IFT), São Paulopt

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