Speaker
Marta Moscati
(Karlsruhe Institute of Technology (KIT))
Description
In this talk I review the status of new physics in $b\to c \tau \nu$ transitions in the EFT framework of dimension-six operators. The fit results, including the recent measurement of $F_L(D^*)$, are presented for all one- and two-dimensional scenarios resulting from the tree level exchange of a single new particle. Particular emphasis is put on the constraint from the $B_c \to \tau \nu$ decay rate. I introduce a sum rule for the branching ratios of $B\to D \tau \nu$, $B\to D^* \tau \nu$ and $\Lambda_b\to \Lambda_c \tau \nu$ which holds for any NP contribution to the Wilson coefficients and predicts an enhancement of the latter decay w.r.t. the Standard Model. I discuss correlations between the polarisation observables in $B\to D \tau \nu$, $B\to D^* \tau \nu$ and their model-discriminating prospects. The talk is based on the results published in https://arxiv.org/abs/1811.09603.
| marta.moscati@kit.edu |
Primary author
Marta Moscati
(Karlsruhe Institute of Technology (KIT))
