Search for lepton-number- and baryon-number-violating tau decays at Belle

Citations Over TimeTop 10% of 2020 papers

Abstract

We search for lepton-number- and baryon-number-violating decays ${\ensuremath{\tau}}^{\ensuremath{-}}\ensuremath{\rightarrow}\overline{p}{e}^{+}{e}^{\ensuremath{-}}$, $p{e}^{\ensuremath{-}}{e}^{\ensuremath{-}}$, $\overline{p}{e}^{+}{\ensuremath{\mu}}^{\ensuremath{-}}$, $\overline{p}{e}^{\ensuremath{-}}{\ensuremath{\mu}}^{+}$, $\overline{p}{\ensuremath{\mu}}^{+}{\ensuremath{\mu}}^{\ensuremath{-}}$, and $p{\ensuremath{\mu}}^{\ensuremath{-}}{\ensuremath{\mu}}^{\ensuremath{-}}$ using $921\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ of data, equivalent to $(841\ifmmode\pm\else\textpm\fi{}12)\ifmmode\times\else\texttimes\fi{}{10}^{6}$ ${\ensuremath{\tau}}^{+}{\ensuremath{\tau}}^{\ensuremath{-}}$ events, recorded with the Belle detector at the KEKB asymmetric-energy ${e}^{+}{e}^{\ensuremath{-}}$ collider. In the absence of a signal, 90% confidence-level upper limits are set on the branching fractions of these decays in the range $(1.8\ensuremath{-}4.0)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}8}$. We set the world's first limits on the first four channels and improve the existing limits by an order of magnitude for the last two channels.

Related Papers

• → Higgs-induced lepton flavor violation(2011)93 cited
• → Lepton Flavor Violation Induced by a Neutral Scalar at Future Lepton Colliders(2018)53 cited
• → New model for radiatively generated Dirac neutrino masses and lepton flavor violating decays of the Higgs boson(2019)19 cited
• → Search for the associated production of a Higgs boson and a top quark pair in multilepton (2 leptons, no hadronically-decaying $τ$ lepton candidates and 4 leptons) final states with the ATLAS detector.(2018)1 cited
• → Searches for Z' gauge bosons predicted by lepton flavor and lepton flavor universality violating models with the CMS experiment at LHC(2018)