Observation of the decay ${\Lambda }_b^0\to {\Lambda }_c^{+}{\tau }^{-}{\overline{\nu }}_{\tau }$

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +992

The first observation of the semileptonic $b$-baryon decay ${\Lambda }_b^0\to {\Lambda }_c^{+}{\tau }^{-}{\overline{\nu }}_{\tau }$, with a significance of $6.1\sigma$, is reported using a data sample correspondin…