Precise predictions for mt, Vcb and tan

Abstract

The fermion mass and mixing angle predictions of a recently proposed framework are investigated for large b and $\tau$ Yukawa couplings. A new allowed region of parameters is found for this large $\tan \beta$ case. The two predictions which are substantially altered, $m_t$ and $\tan \beta$, are displayed, including the dependence on the inputs $|V_{cb}|$, $m_c$, $m_b$ and ${\alpha }_s$. A simple restriction on this framework yields an additional prediction, for $|V_{cb}|$. If the b,t, and $\tau$ Yukawas are equal at the GUT scale then $|\text{Vcb}|$ is predicted and the top quark mass is constrained to lie in the range $\text{mt}=179.\pm 4.$ GeV.

Comments: (beta), 13 pages pages of text plus figures and captions. OHSTPY-HEP-92-018, LBL-332817, UCB-PTH-92/28, Stanford-92-25