Speaker
Johan Andrés Colorado Caicedo
Description
The existence and unknown nature of dark matter motivates dark sector searches at accelerators. The Belle experiment has collected samples of $e^{+}e^{-}$ collision data containing a huge number of $e^{+}e^{-} \rightarrow \tau^{+}\tau^{-}$ events with constrained kinematics and low backgrounds, enabling several world-leading dark matter searches in the sub-GeV mass region. Using 800 fb$^{-1}$ of data collected at or near the $\Upsilon(4S)$ resonance by the Belle experiment, we search for lepton-flavor violating decays $\tau \to e\alpha$ and $\mu \alpha$, where $\alpha$ is a an undetected spin-0 particle (e.g. an axion-like particle).
Author
Co-author
Steven Robertson
(IPP / University of Alberta)