Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1999-04-06
Phys.Lett.B459:563-569,1999
Physics
High Energy Physics
High Energy Physics - Phenomenology
11 pp. LATEX. Version with minor addition accepted for publication in Physics Letters B
Scientific paper
10.1016/S0370-2693(99)00696-6
By supplementing minimal supersymmetric SU(5) (MSSU(5)) with a flavor ${\cal U}(1)$ symmetry and two pairs of $\bar{15}+15$ `matter' supermultiplets, we present an improved model which explains the charged fermion mass hierarchies and the magnitudes of the CKM matrix elements, while avoiding the undesirable asymptotic mass relations $m_s=m_{\mu}, m_d/m_s = m_e/m_{\mu}$. The strong coupling $\alpha_s (M_Z)$ is predicted to be approximately 0.115, and the proton lifetime is estimated to be about five times larger than the MSSU(5) value. The atmospheric and solar neutrino puzzles are respectively resolved via maximal $\nu_{\mu}-\nu_{\tau}$ and small mixing angle $\nu_e-\nu_s$ MSW oscillations, where $\nu_s$ denotes a sterile neutrino. The ${\cal U}(1)$ symmetry ensures not only a light $\nu_s$ but also automatic `matter' parity.
Shafi Qaisar
Tavartkiladze Zurab
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