K.S. Babu

Higgs mediated

We demonstrate a new source for flavor-changing neutral currents within the minimal supersymmetric standard model. At moderate to large tan {beta} , it is no longer possible to diagonalize the masses of the quarks in the same basis as their Yukawa couplings. This generates flavor-violating couplings of the form b{sub R}d{sub L}{phi} and b{sub R}s{sub L}{phi} where {phi} is any of the three neutral, physical Higgs bosons. These new couplings lead to rare processes in the B system such as B{sup 0}{yields}{mu}{sup +}{mu}{sup -} and B{sup 0}-B{sup 0} mixing. We show that the latter are anomalously suppressed, while the former is in the experimentally interesting range, with an observable signal possible at Run II of the Tevatron if m{sub A}(less-or-similar sign)400-700 GeV . (c) 2000 The American Physical Society.In this letter we demonstrate a new source for large flavor-changing neutral currents within the minimal supersymmetric standard model. At moderate to large tan(beta), it is no longer possible to diagonalize the masses of the quarks in the same basis as their Yukawa couplings. This generates large flavor-violating couplings of the form

B^0 \to \mu^{+} \mu^{-}

\bar b_R d_L H

in minimal supersymmetry

and

Minimality Condition and Atmospheric Neutrino Oscillations

\bar b_R s_L H

Large neutrino mixing angles in unified theories

where H is any of the three neutral, physical Higgs bosons. These new couplings lead to rare processes in the B system such as

Experimental consequences of a minimal messenger model for supersymmetry breaking

B^0 -> \mu^+ \mu^-

Natural R parity,

decay and B-Bbar mixing. We show that the latter is anomalously suppressed, while the former is in the experimentally interesting range. Current limits on

\mu

B^0 -> \mu^+ \mu^-

-term, and fermion mass hierarchy from discrete gauge symmetries

already provide nontrivial constraints on models of moderate to large tan(beta), with an observable signal possible at Run II of the Tevatron if m_A < 400-600 GeV, extending to the TeV range if a proposed Run III of 30/fb were to occur.

Suggested new modes in supersymmetric proton decay

A structure is proposed for the mass matrices of the quarks and leptons that arises in a natural way from the assumption that the breaking of SO(10) gauge symmetry is achieved by the smallest possible set of vacuum expectation values. This structure explains well many features of the observed spectrum of quarks and leptons. It reproduces the Georgi-Jarlskog mass relations and leads to a charm quark mass in reasonable agreement with data. It also predicts a large mixing angle between {nu}{sub {mu}} and {nu}{sub {tau}} , as suggested by atmospheric neutrino data. The mixing angles of the electron neutrino are predicted to be small. {copyright} {ital 1998} {ital The American Physical Society}