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Search for a heavy neutrino in $\tau$ decays at Belle
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arxiv 2212.10095 v2 pith:W3W3HB6M submitted 2022-12-20 hep-ex
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abstract
We report on a search for a heavy neutrino in the decays $\tau^- \to \pi^- \nu_h$, $\nu_h \to \pi^\pm \ell-+$, $\ell = e, \mu$. The results are obtained using the full data sample collected with the Belle detector at the KEKB asymmetric energy $e^+e^-$ collider. We observe no significant signal and set 90% CL upper limits on the couplings of the heavy right-handed neutrinos to the conventional SM left-handed neutrinos in the mass range 0.2-1.6 GeV/c$^2$.
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Long-lived sterile neutrinos from axionlike particles at the Super Tau-Charm Facility
hep-ph 2026-05 unverdicted novelty 5.0 of 10
STCF can reach |V_eN|^2 values one to two orders of magnitude below current bounds for heavy neutral leptons via displaced-vertex searches from ALP decays in D-meson production.
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