${\Lambda }_b\to {\pi }^{-}(D_s^{-}){\Lambda }_c(2595),{\pi }^{-}(D_s^{-}){\Lambda }_c(2625)$ decays and $DN,D^{\ast }N$ molecular components

Abstract

From the perspective that the ${\Lambda }_c(2595)$ and ${\Lambda }_c(2625)$ are dynamically generated resonances from the $DN,D^{\ast }N$ interaction and coupled channels, we have evaluated the rates for ${\Lambda }_b\to {\pi }^{-}{\Lambda }_c(2595)$ and ${\Lambda }_b\to {\pi }^{-}{\Lambda }_c(2625)$ up to a global unknown factor that allows us to calculate the ratio of rates and compare with experiment, where good agreement is found. Similarly, we can also make predictions for the ratio of rates of the, yet unknown, decays of ${\Lambda }_b\to D_s^{-}{\Lambda }_c(2595)$ and ${\Lambda }_b\to D_s^{-}{\Lambda }_c(2625)$ and make estimates for their individual branching fractions.

Comments: 9 pages, 3 figures; V2: new references added