Dynamical weak gauge bosons

Abstract

We show at leading order of the 1/ N expansion that composite gauge fields in a supersymmetric U(4 n + 2)/U(4 n) × SU(2) non-linear sigma model become dynamical in some range of parameters. Since the hidden local symmetry in this sigma model is identifiable with a weak SU(2) of the standard electroweak model, we suggest that the observed weak bosons W ± and Z 0 are the dynamical gauge fields in our non-linear sigma model. Some phenomenological difficulties for identifying such composite fields with W ± and Z 0 are also discussed.