Effects of a charged Higgs boson in $B\to D^{(\ast )}\tau \nu$ decays

Abstract

In this talk I consider the current status of $B\to D^{(\ast )}\tau \nu$ decays in the context of two-Higgs-doublet models. The BaBar collaboration has reported an excess in semileptonic $b\to c\tau \nu$ transitions that has gathered recent interest as a possible signature of new physics. The sensitivity of these decays to tree-level charged Higgs boson contributions is discussed, taking into account the constraints from other semileptonic and leptonic meson decays in which the charged Higgs would enter at the same level.

Comments: 6 pages, 1 figure and 2 tables; 2013 EPS Conference Proceedings. v2: minor changes and references added