A. Ishikawa

Search for lepton-flavor-violating $τ^- \to \ell^- K_s^0$ decays at Belle and Belle II

Belle Collaborations, I. Adachi, L. Aggarwal, H. Ahmed et autres

We present the results of a search for charged-lepton-flavor violating decays $τ^{-} \rightarrow \ell^{-}K_{S}^{0}$, where $\ell^{-}$ is either an electron or a muon. We combine $e^+e^-$ data samples recorded by the Belle II experiment at the SuperKEKB collider (428 fb$^{-1}$) with samples …

Search for lepton-flavor-violating tau decays to $\ellα$ at Belle

Belle Collaboration, K. Uno, K. Hayasaka, K. Inami et autres

We report a search for the lepton-flavor-violating decays $τ^{\pm}\to\ell^{\pm}α$~($\ell=e,μ$), where $α$ is an undetected spin-0 particle, such as an axion-like particle using $736\times10^{6}$ tau lepton pairs collected by the Belle detector at the KEKB asymmetric-energy $e^{+}e^{-}$ collider. We find no evidence of …

Measurement of the τ Lepton Mass and an Upper Limit on the Mass Difference between τ+ and τ−

K. Belous, M. Shapkin, A. Sokolov, K. Abe et autres

The mass of the $\ensuremath{\tau}$ lepton has been measured in the decay mode $\ensuremath{\tau}\ensuremath{\rightarrow}3\ensuremath{\pi}{\ensuremath{\nu}}_{\ensuremath{\tau}}$ using a pseudomass technique. The result obtained from $414\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ of data collected with the Belle detector is ${M}_{\ensuremath{\tau}}=[1776.61\ifmmode\pm\else\textpm\fi{}0.13(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.35(\mathrm{sys})]\text{ }\text{ }\mathrm{MeV}/{c}^{2}$. The upper limit on the relative …

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