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Symmetries for vector and axial-vector mesons

Grazzini, M
Published in Physics Letters. B. 1995, vol. 349, no. 4, p. 533-540
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) ⊗ SU(2)]3 symmetry. This symmetry can be obtained either 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) ⊗ 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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CASALBUONI, Roberto et al. Symmetries for vector and axial-vector mesons. In: Physics Letters. B, 1995, vol. 349, n° 4, p. 533-540. https://archive-ouverte.unige.ch/unige:90972

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Deposited on : 2017-01-11

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