Jul 5 – 12, 2017
Venice, Italy
Europe/Zurich timezone
Get the schedule and slides on your phone/tablet using the Conference4me app

Sensitivity to scalar contributions in b to c (u) tau nu decays

Jul 6, 2017, 5:30 PM
Room Mosaici-2 (Palazzo del Casinò)

Room Mosaici-2

Palazzo del Casinò

Parallel Talk Flavour Physics and Fundamental Symmetries Flavour and symmetries


Alejandro Celis (Ludwig Maximilian University)


I present results of an analysis of scalar contributions in b→cτν transitions including the latest measurements of R(D(∗)), the q2 differential distributions in B→D(∗)τν, the τ polarization asymmetry for B→D∗τν, and the bound derived from the total width of the Bc meson. 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 Bc width present a slight tension with the current data on B→D∗τν in this scenario, preferring smaller values for R(D∗). I 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(∗)τν decays or additional decay modes like the baryonic Λb→Λcτν and the inclusive B→Xcτν decays. We also analyze scalar contributions in b→uτν transitions, including the latest measurements of B→τν, providing predictions for Λb→pτν and B→πτν 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.

Primary authors

Alejandro Celis (Ludwig Maximilian University) Martin Jung (TUM IAS / Excellence Cluster Universe) Antonio Pich Xin-Qiang Li

Presentation materials