b-baryon semi-tauonic decays in the Standard Model

Chao Han, Chun Liu

Within the framework of HQET, ${\Lambda }_b\to {\Lambda }_c\tau {\bar{\nu }}_{\tau }$ and ${\Omega }_b\to {\Omega }_c^{(\ast )}\tau {\bar{\nu }}_{\tau }$ weak decays are studied to the order of $1/m_c$ and $1/m_b$. Helicity amplit…