Radiative and electroweak penguin decays at $e^{+}{e}^{-}$ $B$-factories

Abstract

$B$-meson decays involving radiative and electroweak penguin processes are sensitive probes to new physics beyond the standard model. The Belle experiment recently reported measurements of the inclusive radiative decay $B\to X_s^{}\gamma$, and exclusive radiative decays $B\to K^{\ast }\gamma$ and $B\to K_S^0\eta \gamma$. A lepton-flavor dependent measurements of angular observables for the decays $B\to K^{\ast }\ell \ell$ by Belle hinted at possible deviation from lepton-flavor-universality. Any departure from lepton flavor universality is essentially accompanied by lepton flavor violation. Recently, lepton-flavor-violating decays $B^0\to K^{\ast 0}{\mu }^{\pm }{e}^{\mp }$ are searched at Belle, and stringent limits on their branching fractions are set. The BaBar experiment has searched for the decay $B^{+}\to K^{+}{\tau }^{+}{\tau }^{-}$, which comprises third generation of the lepton family. The decays $B\to h\nu \bar{\nu }$ are searched at Belle and obtained upper limits for these decays are close to the standard model predictions.

Comments: Proceeding of the FPCP 2018 conference, IIT, Hyderabad