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SYMMETRIES FOR VECTOR AND AXIAL-VECTOR MESONS

R. Casalbuoni·A. Deandrea·S. De Curtis·D. Dominici·F. Feruglio·R. Gatto·M. Grazzini
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Abstract

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 á 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.

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R. Casalbuoni, A. Deandrea, S. De Curtis, D. Dominici, F. Feruglio, R. Gatto, M. Grazzini. 1995-02-08. SYMMETRIES FOR VECTOR AND AXIAL-VECTOR MESONS. https://doi.org/10.1016/0370-2693(95)00291-r

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