  The study of the Higgs boson properties is one of the most relevant
activities in current particle physics. In particular, the Higgs boson
couplings to third generation fermions is an important test of the mechanism of
mass generation. In spite of their impact on the production and decay
properties of the Higgs boson, the values of these couplings are still
uncertain and, in models of new physics, they can differ in magnitude as well
as in sign with respect to the Standard Model case. In this article, we study
the possibility of a wrong sign bottom-quark Yukawa coupling within the
framework of the Minimal and Next-to-Minimal Supersymmetric Standard Model.
Possible experimental tests are also discussed, including novel decays of the
heavy CP-even and CP-odd Higgs fields that may be probed in the near future and
that may lead to an explanation of some intriguing di-boson signatures observed
at the ATLAS experiment.
