Radiative quark masses constrained by the gauge group only
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Abstract
We discuss the possibility of obtaining the observed pattern of quark masses and mixings as a consequence of radiative corrections, gauge invariance and particle content of the theory. We do not allow any kind of additional symmetry, such as family and discrete symmetries. A model based on the gauge groupSU(3)×SU(2) L ×SU(2) R ×U(1) B−L is considered. It turns out that the correct values of quark masses can be reasonably reproduced. The typical strength of the flavour changing couplings of theZ0-boson is however at least one order of magnitude above the experimental upper bounds.
A comparison is made with a model in which an additional discrete symmetry is present. In this case flavour changing phenomena can be kept under control.
Keywords
Field Theory Elementary Particle Quantum Field Theory Gauge Group Quark MassePreview
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