Gauge Model of Quark-Lepton Nonuniversality

Abstract

We propose a gauge model where quark-lepton universality is an accidental symmetry which is only approximate, in analogy to the well-accepted notion that strong isospin is accidental and approximate. This is a natural framework for explaining possible small deviations of quark-lepton universality which is applicable to the recently reported apparent nonunitarity of the quark mixing matrix. As a result, small departures from quark-lepton universality are expected in Z decays as well as in the recent neutrino data of the NuTeV collaboration and in future low-energy experiments. New physics is predicted at the TeV scale.

11 pages, no figure

References in corpus (1)

• Is the Unitarity of the quark-mixing-CKM-matrix violated in neutron $\beta$-decay?

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