Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1995-02-07
Phys.Lett. B349 (1995) 533-540
Physics
High Energy Physics
High Energy Physics - Phenomenology
paper unchanged, figure replaced (using new version of uufiles)
Scientific paper
10.1016/0370-2693(95)00291-R
We discuss the possible symmetries of the effective lagrangian describing interacting pseudoscalar-, vector-, and axial-vector mesons. Specific choices of the parameters give rise to an $[SU(2)\otimes SU(2)]^3$ symmetry. This symmetry can be obtained either {\it \'a la} Georgi, with all states in the spectrum remaining massless, or in a new realization, implying decoupling of the pseudoscalar bosons from degenerate vector and axial-vector mesons. This second possibility, when minimally coupled with $SU(2)\otimes U(1)$ electroweak gauge vector bosons, seems particularly appealing. All deviations in the low-energy electroweak parameters are strongly suppressed, and the vector and axial-vector states turn out to be quite narrow. A nearby strong electroweak sector would then be conceivable and in principle it could be explored with relatively low energy accelerators.
Casalbuoni Roberto
Curtis Stefania de
Deandrea Aldo
Dominici Daniele
Feruglio Ferruccio
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