Large- N Weinberg-Tomozawa interaction and spin-flavor symmetry
Departamento de Física Atómica, Molecular y Nuclear, Universidad de Granada, E-18071, Granada, Spain
Accepted: 15 December 2006
Published online: 20 March 2007
The construction of an extended version of the Weinberg-Tomozawa Lagrangian, in which baryons and mesons form spin-flavor multiplets, is reviewed and some of its properties discussed, for an arbitrary number of colors and flavors. The coefficient tables of spin-flavor irreducible representations related by crossing between the s-, t- and u-channels are explicitly constructed.
PACS: 14.20.Gk Baryon resonances with S = 0 – / 11.15.Pg Expansions for large numbers of components (e.g. , 1/N c expansions) – / 11.10.St Bound and unstable states; Bethe-Salpeter equations – / 11.30.Rd Chiral symmetries –
© Società Italiana di Fisica and Springer-Verlag, 2007