B → τν in two-Higgs doublet models with MFV

We analyse the B -> tau nu decay in a generic two-Higgs doublet model satisfying the MFV hypothesis. In particular, we analyse under which conditions B(B -> tau nu) can be substantially enhanced over its SM value, taking into account the constraints of K -> mu nu, B -> X-s gamma, and B-s -> mu(+)mu(-). We find that for large tan beta values and Peccei-Quinn symmetry breaking terms of O(1/tan beta) a sizable (similar to 50%) enhancement of B(B -> tau nu) is possible, even for m(H) similar to 1TeV.