TY  - JOUR
AU  - Celis, A.
AU  - Jung, M.
AU  - Li, X. Q.
AU  - Pich, A.
PY  - 2017
DA  - 2017//
TI  - Scalar contributions to b -> c(u) tau nu transitions
T2  - Phys. Lett. B
JO  - Physics Letters B
SP  - 168
EP  - 179
VL  - 771
PB  - Elsevier Science Bv
AB  - We perform a comprehensive analysis of scalar contributions in b -> c tau nu transitions including the latest measurements of R(D-(*)), the q(2) differential distributions in B -> D-(*) tau nu the tau polarization asymmetry for B -> D*tau nu, and the bound derived from the total width of the B-c meson. We find that scalar contributions with the simultaneous presence of both left- and right-handed couplings to quarks can explain the available data, specifically R(D-(*)) together with the measured differential distributions. However, the constraints from the total B-c width present a slight tension with the current data on B -> D*tau nu in this scenario, preferring smaller values for R(D*). We discuss possibilities to disentangle scalar new physics from other new-physics scenarios like the presence of only a left-handed vector current, via additional observables in B -> D(*)tau nu decays or additional decay modes like the baryonic Lambda(b) -> Lambda(c)tau nu and the inclusive B -> X-c tau nu decays. We also analyze scalar contributions in b -> u tau nu transitions, including the latest measurements of B -> tau nu providing predictions for Lambda(b) -> p tau nu and B -> pi tau nu decays. The potential complementarity between the b -> u and b -> c sectors is finally investigated once assumptions about the flavour structure of the underlying theory are made.
SN  - 0370-2693
UR  - http://arxiv.org/abs/1612.07757
UR  - https://doi.org/10.1016/j.physletb.2017.05.037
DO  - 10.1016/j.physletb.2017.05.037
LA  - English
N1  - WOS:000406183300024
ID  - Celis_etal2017
ER  -