Heavy top quark from Fritzsch mass matrices

Details Heavy top quark from Fritzsch mass matrices Heavy top quark from Fritzsch mass matrices

1992-10-20

arxiv.org/abs/hep-ph/9210251v1

Phys.Rev.D47:5004-5012,1993

Physics

High Energy Physics

High Energy Physics - Phenomenology

LaTeX, 14 figures (not included, available on request)

Scientific paper

10.1103/PhysRevD.47.5004

It is shown, contrary to common belief, that the Fritzsch ansatz for the quark mass matrices admits a heavy top quark. With the ansatz prescribed at the supersymmetric grand unified (GUT) scale, one finds that the top quark may be as heavy as 145 GeV, provided that tan$\beta$ (the ratio of the vacuum expectation values of the two higgs doublets) $\gg 1$. Within a non-supersymmetric GUT framework with two (one) light higgs doublets, the corresponding approximate upper bound on the top mass is $120~ (90)$ GeV. Our results are based on a general one--loop renormalization group analysis of the quark masses and mixing angles and are readily applied to alternative mass matrix ans\"{a}tze.

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