TY  - JOUR
AU  - Celis, A.
AU  - Jung, M.
AU  - Li, X. Q.
AU  - Pich, A.
PY  - 2013
DA  - 2013//
TI  - Sensitivity to charged scalars in B -> D-(*)tau nu(tau) and B -> tau nu(tau) decays
T2  - J. High Energy Phys.
JO  - Journal of High Energy Physics
SP  - 054
EP  - 27pp
VL  - 01
IS  - 1
PB  - Springer
KW  - Beyond Standard Model
KW  - B-Physics
AB  - We analyze the recent experimental evidence for an excess of tau-lepton production in several exclusive semileptonic B-meson decays in the context of two-Higgs-doublet models. These decay modes are sensitive to the exchange of charged scalars and constrain strongly their Yukawa interactions. While the usual Type-II scenario cannot accommodate the recent BaBar data, this is possible within more general models in which the charged-scalar couplings to up-type quarks are not as suppressed. Both the B -> D-(*)tau nu(tau) and the B -> tau nu(tau) data can be fitted within the framework of the Aligned Two-Higgs-Doublet Model, but the resulting parameter ranges are in conflict with the constraints from leptonic charm decays. This could indicate a departure from the family universality of the Yukawa couplings, beyond their characteristic fermion mass dependence. We discuss several new observables that are sensitive to a hypothetical charged-scalar contribution, demonstrating that they are well suited to distinguish between different scenarios of new physics in the scalar sector, and also between this group and models with different Dirac structures; their experimental study would therefore shed light on the relevance of scalar exchanges in semileptonic b -> c tau(-)(nu) over bar (tau) transitions.
SN  - 1126-6708
UR  - http://arxiv.org/abs/arXiv:1210.8443
UR  - https://doi.org/10.1007/JHEP01(2013)054
DO  - 10.1007/JHEP01(2013)054
LA  - English
N1  - WOS:000315583200054
ID  - Celis_etal2013
ER  -