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May 6 – 10, 2019
Canada/Pacific timezone

New Physics in $b\to c \tau \nu$: Impact of Polarisation Observables and $B_c \to \tau \nu$

May 7, 2019, 4:15 PM
Elliott 162

Elliott 162

Contributed Oral Heavy Quark Decays and CKM Metrology Parallel session 2


Marta Moscati (Karlsruhe Institute of Technology (KIT))


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

Primary author

Marta Moscati (Karlsruhe Institute of Technology (KIT))

Presentation materials