Predictive Ansatz for Fermion Masses in SUSY GUTS

Abstract

We reexamine a succesful fermion mass Ansatz proposed by Giudice for a wide range of the ratio $tan\beta =\frac{<\bar{h}>}{<h>}$ (where $\bar{h},h$ are the two standard higgs fields), in the context of supersymmetric grand unified theories. We find that the 7 predictions of the ansatz, $V_{us},V_{cb},V_{ub},m_u,m_d,m_s$ and $m_b$ are in good agreement with the experiment when either {\it i) } $tan\beta \simeq 1$ or {\it ii)} $tan\beta \ge 30$. A correct prediction for the bottom mass gives a lower limit on $m_t\ge 125$ for case {\it (i)}, in agreement with the previous analysis, while in case {\it (ii)} $m_t\ge 145$.

Comments: 8 pages, 3 figures NOT included, available on request, LaTex, IOA 281/92, NTUA 37/92 preprints