ICHEP 2016 Chicago

Measurements of electroweak penguin and leptonic B(s) decays at Belle (10' + 5')

6 Aug 2016, 14:00

15m

Superior A

Oral Presentation Quark and Lepton Flavor Physics Quark and Lepton Flavor Physics

Speaker

Felicitas Breibeck (Austrian Academy of Sciences)

Description

We present the results of measurement of electroweak penguin B decays. We show the full angular analysis of $B\to K^{\ast }{\ell }^{+}{\ell }^{-}$ to extract form factor insensitive variables such as $P_5^{\prime }$. The branching fraction of inclusive $b\to s{\ell }^{+}{\ell }^{-}$ is measured with a sum-of-exclusive-modes approach. We also report searches for leptonic $B$ decays including the lepton-flavor-violating mode: $B\to e^{+}{e}^{-}$, ${\mu }^{+}{\mu }^{-}$, ${\tau }^{+}{\tau }^{-}$, $e^{\pm }{\mu }^{\mp }$. All the analyses are based on the full data set of Belle containing 772 million $B\bar{B}$ pairs.

A related decay $B_s\to {\tau }^{+}{\tau }^{-}$ can also be studied by a hadronic $B_s$ tagging tool that is being developed for the data sample of 121${\mathrm{f}\mathrm{b}}^{-1}$ collected at the $\mathrm{{\rm Y}}(10860)$ resonance at Belle. The method is based on a hierarchical approach in which the $B_s$ mesons and their daughters are reconstructed in several stages, harnessing more than 100 neural network variables.

Presentation materials

ICHEP_2016_Breibeck.pdf