Abi Soffer

07 July 2018
ICHEP2018

Abstract: BABAR, Belle, and LHCb measure the rates for the decays B→D(∗)τν and Bc→J/ψτν to be higher than the SM expectations, with a combined discrepancy of 4.1σ (for B→D(∗)τν only) or ∼4.3σ (including all modes). In the coming years, Belle II and LHCb will greatly improve the measurement precision, to the level that systematic uncertainties associated with the background B→D∗∗ℓν become critical. We show how to utilize Belle II's high spatial resolution to obtain a model-independent handle on this background and improve the overall signal-backgroud. We also study the impact of vertexing on Belle II’s capability to perform this measurement with the decay τ→3πν, as already demonstrated by LHCb.

Note: 15' including questions