Observation of the decay $B \to p\overline{p}\mu\nu$ and Lepton Flavour Universality with $B \to p\overline{p}\mu\nu$

The first observation of the $B \to p\overline{p}\mu$ decay should be possible at the LHCb experiment with a significance far in excess of 5$\sigma$ . As well as a branching fraction measurement, a precision measurement of the $p\overline{p}$ mass spectrum will be performed. The ratio of branching fractions $\mathcal{B}(B \to p\overline{p}\tau)/\mathcal{B}(B \to p\overline{p}\mu)$ is a test of lepton flavour universality in the Standard Model. This measurement is in progress at LHCb and would be the first test involving a $b\to u\tau\nu$ transition.