Sourav Dey

04 December 2023
The 17th International Workshop on Tau Lepton Physics

Abstract: The existence and unknown nature of dark matter motivate dark sector searches at accelerators. The Belle and Belle II experiments enable dark sector searches in the sub-GeV mass region. We search for lepton-flavor-violating tau decays of type tau to l alpha, where l is e/mu and alpha is an invisible particle. We also search for the existence of a heavy neutrino in tau decays. Finally, we present a recent search for a dark, leptophilic scalar particle produced in association with pairs at Belle.