The top quark mass and flavor mixing in a Seesaw model of Quark Masses

Details The top quark mass and flavor mixing in a Seesaw model of Quark Masses The top quark mass and flavor mixing in a Seesaw model of Quark Masses

1997-03-06

arxiv.org/abs/hep-ph/9703249v1

Phys.Lett.B410:233-240,1997

Physics

High Energy Physics

High Energy Physics - Phenomenology

13 pgs. LaTeX form

Scientific paper

10.1016/S0370-2693(97)01021-6

The top quark mass and the flavor mixing are studied in the context of a Seesaw model of Quark Masses based on the gauge group $SU(2)_L \times SU(2)_R \times U(1)$. Six isosinglet quarks are introduced to give rise to the mass hierarchy of ordinary quarks. In this scheme, we reexamine a mechanism for the generation of the top quark mass. It is shown that, in order to prevent the Seesaw mechanism to act for the top quark, the mass parameter of its isosinglet partner must be much smaller than the breaking scale of $SU(2)_R$. As a result the fourth lightest up quark must have a mass of the order of the breaking scale of $SU(2)_R$, and a large mixing between the right-handed top quark and its singlet partner occurs. We also show that this mechanism is compatible with the mass spectrum of light quarks and their flavor mixing.

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