1 research outputs found
Soft Yukawa couplings in supersymmetric theories
The possibility of radiatively generated fermion masses arising from chiral
flavor violation in soft supersymmetry-breaking terms is explored. Vacuum
stability constraints are considered in various classes of models, and allow in
principle all of the first- and second-generation quarks and leptons and the
-quark to obtain masses radiatively. Radiatively induced Higgs-fermion
couplings have non-trivial momentum-dependent form factors, which at low
momentum are enhanced with respect to the case of tree-level Yukawa couplings.
These form factors may be probed by various sum rules and relations among Higgs
boson decay widths and branching ratios to fermion final states. An apparent,
large, hard violation of supersymmetry also results for Higgsino couplings.
Mixing between left- and right-handed scalar superpartners is enhanced. A
radiative muon mass is shown to lead to a relatively large and potentially
measurable contribution to the muon anomalous magnetic moment. If the
light-quark masses arise radiatively, the neutron electric dipole moment is
suppressed by a natural phase alignment between the masses and dipole moment,
and is below the current experimental bound. The possibility of neutrino masses
arising from softly broken lepton number, and concomitant enhanced
sneutrino-antisneutrino oscillations, is briefly discussed.Comment: 66 pages. LaTex + RevTex. 16 figures (included). Published version
(minor changes and typos corrected