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Chiral SU(3) Bethe Salpeter Model: Extension to SU(6) and SU(8) Spin-Flavor Symmetries

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Chiral SU(3) Bethe Salpeter Model: Extension to SU(6) and SU(8) Spin-Flavor Symmetries

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Nieves Pamplona, Juan Miguel; García Recio, Carmen; Salcedo, Lorenzo Luis; Magas, Volodymyr; Ramos Gómez, Àngels; Mizutani, Tetsuro; Toki, Hiroshi

Aquest document és un/a article, creat/da en: 2008

Consistent SU(6) and SU(8) spin-flavor extensions of the SU(3) flavor Weinberg-Tomozawa (WT) meson-baryon chiral Lagrangian are constructed, which incorporate vector meson degrees of freedom. In the charmless sector, the on-shell approximation to the Bethe-Salpeter (BS) approach successfully reproduces previous SU(3) WT results for the lowest-lying s-wavene gative parity baryon resonances. It also provides some information on the dynamics of heavier ones and of the lightest d-wave negative parity resonances, as e.g. the Lambda(1520). For charmed baryons the scheme is consistent with heavy quark symmetry, and our preliminary results in the strangeness-less charm C = +1 sector describe the mainfeatures of the three-star J(P) = 1/2(-) Lambda(c)(2595) and J(P) = 3/2(-) Lambda(c)(2625) resonances. We also find a second broad J(P) =1/2 state close to the Lambda(c)(2595).

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