Observation of $${{\varLambda } ^0_{b}} \!\rightarrow {{\varLambda } ^+_{c}} {\hspace{1.79993pt}\overline{\hspace{-1.79993pt}D}} {}^{(*)0}{{K} ^-} $$ and $${{\varLambda } ^0_{b}} \!\rightarrow {{\varLambda } ^+_{c}} {{D} ^{*-}_{s}} $$ decays

Abstract The decays $${{\varLambda } ^0_{b}} \!\rightarrow {{\varLambda } ^+_{c}} {\hspace{1.79993pt}\overline{\hspace{-1.79993pt}D}} {}^{(*)0}{{K} ^-} $$ Λ b 0 → Λ c + D ¯ ( ∗ ) 0 K - and $${{\varLambda } ^0_{b}} \!\rightarrow {{\varLambda } ^+_{c}} {{D} ^{*-}_{s}} $$ Λ b 0 → Λ c + D s ∗ - are observed for the first time, in proton-proton collision data at $$\sqrt{s} =13\text {Te\hspace{-1.00006pt}V} $$ s = 13 Te V , corresponding to an integrated luminosity of 5.4 $$\text {fb} ^{-1}$$ fb - 1 collected with the LHCb detector. Their ratios of branching fractions with respect to the $${{\varLambda } ^0_{b}} \!\rightarrow {{\varLambda } ^+_{c}} {{D} ^-_{s}} $$ Λ b 0 → Λ c + D s - mode are measured to be $$\begin{aligned} \begin{aligned} \frac{\mathcal {B}\left( {{\varLambda } ^0_{b}} \!\rightarrow {{\varLambda } ^+_{c}} {{\hspace{1.79993pt}\overline{\hspace{-1.79993pt}D}} {}^0} {{K} ^-} \right) }{\mathcal {B}\left( {{\varLambda } ^0_{b}} \!\rightarrow {{\varLambda } ^+_{c}} {{D} ^-_{s}} \right) }&= 0.1908 {}_{-0.0034}^{+0.0036} {}_{-0.0018}^{+0.0016} \pm 0.0038,\\ \frac{\mathcal {B}\left( {{\varLambda } ^0_{b}} \!\rightarrow {{\varLambda } ^+_{c}} {{\hspace{1.79993pt}\overline{\hspace{-1.79993pt}D}} {}^{*0}} {{K} ^-} \right) }{\mathcal {B}\left( {{\varLambda } ^0_{b}} \!\rightarrow {{\varLambda } ^+_{c}} {{D} ^-_{s}} \right) }&= 0.589 {}_{-0.017}^{+0.018} {}_{-0.018}^{+0.017} \pm 0.012,\\ \frac{\mathcal {B}\left( {{\varLambda } ^0_{b}} \!\rightarrow {{\varLambda } ^+_{c}} {{D} ^{*-}_{s}} \right) }{\mathcal {B}\left( {{\varLambda } ^0_{b}} \!\rightarrow {{\varLambda } ^+_{c}} {{D} ^-_{s}} \right) }&= 1.668 \pm 0.022 {}_{-0.055}^{+0.061}, \end{aligned} \end{aligned}$$ B Λ b 0 → Λ c + D ¯ 0 K - B

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