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Chiral symmetry amplitudes in the S-wave isoscalar and isovector channels and the sigma, f(0)(980), a(0)(980) scalar mesons

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Chiral symmetry amplitudes in the S-wave isoscalar and isovector channels and the sigma, f(0)(980), a(0)(980) scalar mesons

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dc.contributor.author Oller Berber, José Antonio
dc.contributor.author Oset Báguena, Eulogio
dc.date.accessioned 2015-09-04T10:53:31Z
dc.date.available 2015-09-04T10:53:31Z
dc.date.issued 1997
dc.identifier.citation Oller Berber, José Antonio Oset Báguena, Eulogio 1997 Chiral symmetry amplitudes in the S-wave isoscalar and isovector channels and the sigma, f(0)(980), a(0)(980) scalar mesons Nuclear Physics A 620 4 438 456
dc.identifier.uri http://hdl.handle.net/10550/46860
dc.description.abstract We use a nonperturbative approach which combines coupled channel Lippmann Schwinger equations with meson-meson potentials provided by the lowest order chiral Lagrangians. By means of one parameter, a cut off in the momentum of the loop integrals, which results of the order of 1 GeV, we obtain singularities in the S-wave amplitudes corresponding to the \sigma,f_0 and a_0 resonances. The \pi\pi-->\pi\pi, \pi\pi-->K\bar{K} phase shifts and inelasticities in the T=0 scalar channel are well reproduced as well as the \pi^-\eta and K^-K^0 mass distributions in the T=1 channel. Furthermore, the total and partial decay widths of the f_0 and a_0 resonances are properly reproduced including also the decay into the \gamma\gamma channel. The results seem to indicate that chiral symmetry constraints at low energy and unitarity in coupled channels is the basic information contained in the meson-meson interaction below \sqrt(s)=1.2 GeV.
dc.language.iso eng
dc.relation.ispartof Nuclear Physics A, 1997, vol. 620, num. 4, p. 438-456
dc.subject Física
dc.title Chiral symmetry amplitudes in the S-wave isoscalar and isovector channels and the sigma, f(0)(980), a(0)(980) scalar mesons
dc.type journal article es_ES
dc.date.updated 2015-09-04T10:53:31Z
dc.identifier.doi 10.1016/S0375-9474(97)00160-7
dc.identifier.idgrec 079445
dc.rights.accessRights open access es_ES

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