Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2008-02-12
Mod.Phys.Lett.A23:2297-2300,2008
Physics
High Energy Physics
High Energy Physics - Phenomenology
Presented at Chiral07: Chiral Symmetry in Hadron and Nuclear Physics November 13-16, 2007, Osaka University, Japan
Scientific paper
10.1142/S021773230802923X
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--wave negative 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 main features 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)
Asensio Ramos Andrés
Garcia-Recio Carmen
Magas V.
Mizutani Takashi
Nieves Juan
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