  In some class of supersymmetric models, small neutrino mass is given as a
consequence of the supersymmetry (SUSY) breaking. Phenomenologically
interesting features of this scenario are as follows: (i) the right-handed
sneutrino mass could be as low as TeV scale due to the Giudice-Masiero
mechanism, and (ii) a scalar trilinear interaction of
Higgs-slepton-(right-handed) sneutrino could be sizable without suppression by
the small neutrino Yukawa coupling. We study some phenomenological aspects of
this scenario focusing on the scalar trilinear interaction. We show that the
1-loop correction by sneutrino exchange to the lightest Higgs boson mass
destructively interferes with top-stop contributions in the minimal SUSY
Standard Model. We find that a decay of charged Higgs boson into sneutrino and
charged slepton is sizably enhanced and hence it gives rise to a distinctive
signal at future collider experiments in some parameter space.
