10-17 July 2019
Europe/Brussels timezone

Precision predictions for B -> rho tau nu and B -> omega tau nu in the SM and beyond

12 Jul 2019, 10:35
Campus Ledeganck - Aud. 5 (Ghent)

Campus Ledeganck - Aud. 5


Parallel talk Flavour Physics and CP Violation Flavour Physics and CP Violation


Markus Prim (KIT)


We present new precision predictions for semitauonic decays involving rho and omega final state mesons. These decay channels offer an interesting orthogonal probe to study the existing B anomalies in semitauonic transitions and are accessible with the Belle II experiment. The predictions are based on combining existing light-cone sum-rule calculations for the form factors with measured experimental spectra from the BaBar and Belle collaborations. This allows us to extrapolate the light-lepton form factor predictions reliably to large values of the four-momentum transfer squared, q2, and in turn to derive precise predictions for R(rho) and R(omega), the ratio of the total decay rates of B -> rho l nu and B -> omega l nu for tau final states with respect to light leptons in the SM. In addition, we investigate the impact of all four-fermi operators on the semitauonic q2 spectra and these ratios.

Primary authors

Florian Urs Bernlochner (KIT - Karlsruhe Institute of Technology (DE)) Markus Prim (KIT)

Presentation Materials