  In this manuscript the B -> pi tau nu decay is investigated in the context of
the 2HDM type II extension of the SM. In particular, predictions for the ratio
of semileptonic branching fractions from l = tau and l = electron, muon are
produced and an exclusion based on the MSSM parameters tan beta and mH+ from a
preliminary Belle measurement are reported. An alternative variable to the
ratio of branching fractions that could offer increased sensitivity is
discussed that could result in increased sensitivity to rule out contributions
from additional scalar mediators.
