Jul 6 – 13, 2022
Bologna, Italy
Europe/Rome timezone

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

Jul 9, 2022, 3:55 PM
Room 9 (Indaco)

Room 9 (Indaco)

Parallel Talk Quark and Lepton Flavour Physics Quark and Lepton Flavour Physics


Gaetano de Marino


We report the results of the search for baryon-number-violating decay $B^- \to \bar\Xi_c^0 \Lambda_c^-$. We use a data sample containing 772 million $B\bar{B}$ pairs collected by the Belle detector operating at the asymmetric $e^{+}e^{-}$ collider KEKB. The results can be interpreted in terms of the previously-discovered Standard Model decay $B^- \to \bar\Xi_c^0 \Lambda_c^-$, followed by $\Xi_c^0-\bar\Xi_c^0$ oscillations. The measurements of baryon-number-violating oscillations in the heavy-baryon sector provide an avenue to investigate the origin of matter-antimatter asymmetry of the universe. The searches of lepton-flavor-violating decays, including $\Upsilon(1S) \to \ell\ell'$ $(\ell=e,\mu; \ell'=e,\mu,\tau)$, and $B \to \ell\tau$, are also reported in this presentation.

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