Simultaneous extractions of |Vub| and |Vcb| with only the exclusive Λb decays

We perform the simultaneous $\left|V_{ub}\right|$ and $\left|V_{cb}\right|$ extractions with only the exclusive ${\Lambda }_b$ decays of ${\Lambda }_b\to (p,{\Lambda }_c^{+})\mu {\overline{\nu }}_{\mu }$, ${\Lambda }_b\to p{\pi }^{-}$ and ${\Lambda }_b\to {\Lambda }_c^{+}({\pi }^{-},D^{-})$. We obtain that $\left|V_{ub}\right|=(3.7\pm 0.3)\times {10}^{-3}$ and $\left|V_{cb}\right|=(45.9\pm 2.7)\times {10}^{-3}$. Our value of $\left|V_{ub}\right|$ is larger than that of $(3.27\pm 0.15\pm 0.16\pm 0.06)\times {10}^{-3}$, previously extracted by the LHC Collaboration from the exclusive ${\Lambda }_b$ decays also, but nearly identical to $(3.72\pm 0.19)\times {10}^{-3}$ from the exclusive B decays. On the other hand, our extracted result of $\left|V_{cb}\right|$ favors the value of $(42.2\pm 0.8)\times {10}^{-3}$ from the inclusive B decays.