PoS - Proceedings of Science
Volume 445 - 21st Conference on Flavor Physics and CP Violation (FPCP2023) - Parallel session B
Recent tau and dark-sector results at Belle II
G. Räuber* and  On behalf of the BELLE II collaboration
Full text: pdf
Pre-published on: September 22, 2023
Published on: November 14, 2023
The Belle II experiment investigates the potential interactions between Standard Model (SM) particles and dark sector particles by means of weak couplings mediated by new particles. We present the outcomes of two distinct searches. First, we examine rare $B$ decays in search of a long-lived (pseudo)scalar particle. Then, we provide an update on the ongoing investigation into an invisibly decaying $Z′$ boson. Furthermore, we look into lepton flavor violation by exploring $\tau$ decays into $\ell \alpha$, where $\alpha$ represents a novel, invisible boson. We also report on the first inclusively tagged reconstruction of $\tau$ pair events, focusing on the neutrinoless decays $\tau \to \ell \phi$. Lastly, we present the most precise measurement of the $\tau$ lepton mass worldwide. All of these studies utilize data collected by the Belle II detector during the period of 2019-2021.
DOI: https://doi.org/10.22323/1.445.0071
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