Time-reversal asymmetries in ${\Lambda }_b\to \Lambda (\to p{\pi }^{-}){\ell }^{+}{\ell }^{-}$

Chao-Qiang Geng, Chia-Wei Liu, Zheng-Yi Wei

We study the decays of ${\Lambda }_b\to \Lambda (\to p{\pi }^{-}){\ell }^{+}{\ell }^{-}$ with $\ell =(e,\mu ,\tau )$. In particular, we examine the full angular distributions with polarized ${\Lambda }_b$ and identify the…