Abstract
The decays Λb0→Λc+D¯(∗)0K-\\documentclass[12pt]{minimal} \\usepackage{amsmath} \\usepackage{wasysym} \\usepackage{amsfonts} \\usepackage{amssymb} \\usepackage{amsbsy} \\usepackage{mathrsfs} \\usepackage{upgreek} \\setlength{\\oddsidemargin}{-69pt} \\begin{document}$${{\\varLambda } ^0_{b}} \\!\\rightarrow {{\\varLambda } ^+_{c}} {\\hspace{1.79993pt}\\overline{\\hspace{-1.79993pt}D}} {}^{(*)0}{{K} ^-} $$\\end{document} and Λb0→Λc+Ds∗-\\documentclass[12pt]{minimal} \\usepackage{amsmath} \\usepackage{wasysym} \\usepackage{amsfonts} \\usepackage{amssymb} \\usepackage{amsbsy} \\usepackage{mathrsfs} \\usepackage{upgreek} \\setlength{\\oddsidemargin}{-69pt} \\begin{document}$${{\\varLambda } ^0_{b}} \\!\\rightarrow {{\\varLambda } ^+_{c}} {{D} ^{*-}_{s}} $$\\end{document} are observed for the first time, in proton-proton collision data at s=13TeV\\documentclass[12pt]{minimal} \\usepackage{amsmath} \\usepackage{wasysym} \\usepackage{amsfonts} \\usepackage{amssymb} \\usepackage{amsbsy} \\usepackage{mathrsfs} \\usepackage{upgreek} \\setlength{\\oddsidemargin}{-69pt} \\begin{document}$$\\sqrt{s} =13\ ext {Te\\hspace{-1.00006pt}V} $$\\end{document}, corresponding to an integrated luminosity of 5.4fb-1\\documentclass[12pt]{minimal} \\usepackage{amsmath} \\usepackage{wasysym} \\usepackage{amsfonts} \\usepackage{amssymb} \\usepackage{amsbsy} \\usepackage{mathrsfs} \\usepackage{upgreek} \\setlength{\\oddsidemargin}{-69pt} \\begin{document}$$\ ext {fb} ^{-1}$$\\end{document} collected with the LHCb detector. Their ratios of branching fractions with respect to the Λb0→Λc+Ds-\\documentclass[12pt]{minimal} \\usepackage{amsmath} \\usepackage{wasysym} \\usepackage{amsfonts} \\usepackage{amssymb} \\usepackage{amsbsy} \\usepackage{mathrsfs} \\usepackage{upgreek} \\setlength{\\oddsidemargin}{-69pt} \\begin{document}$${{\\varLambda } ^0_{b}} \\!\\rightarrow {{\\varLambda } ^+_{c}} {{D} ^-_{s}} $$\\end{document} mode are measured to be BΛb0→Λc+D¯0K-BΛb0→Λc+Ds-=0.1908-0.0034+0.0036-0.0018+0.0016±0.0038,BΛb0→Λc+D¯∗0K-BΛb0→Λc+Ds-=0.589-0.017+0.018-0.018+0.017±0.012,BΛb0→Λc+Ds∗-BΛb0→Λc+Ds-=1.668±0.022-0.055+0.061,\\documentclass[12pt]{minimal} \\usepackage{amsmath} \\usepackage{wasysym} \\usepackage{amsfonts} \\usepackage{amssymb} \\usepackage{amsbsy} \\usepackage{mathrsfs} \\usepackage{upgreek} \\setlength{\\oddsidemargin}{-69pt} \\begin{document}$$\\begin{aligned} \\begin{aligned} \\frac{\\mathcal {B}\\left( {{\\varLambda } ^0_{b}} \\!\\rightarrow {{\\varLambda } ^+_{c}} {{\\hspace{1.79993pt}\\overline{\\hspace{-1.79993pt}D}} {}^0} {{K} ^-} \\right) }{\\mathcal {B}\\left( {{\\varLambda } ^0_{b}} \\!\\rightarrow {{\\varLambda } ^+_{c}} {{D} ^-_{s}} \\right) }&= 0.1908 {}_{-0.0034}^{+0.0036} {}_{-0.0018}^{+0.0016} \\pm 0.0038,\\\\ \\frac{\\mathcal {B}\\left( {{\\varLambda } ^0_{b}} \\!\\rightarrow {{\\varLambda } ^+_{c}} {{\\hspace{1.79993pt}\\overline{\\hspace{-1.79993pt}D}} {}^{*0}} {{K} ^-} \\right) }{\\mathcal {B}\\left( {{\\varLambda } ^0_{b}} \\!\\rightarrow {{\\varLambda } ^+_{c}} {{D} ^-_{s}} \\right) }&= 0.589 {}_{-0.017}^{+0.018} {}_{-0.018}^{+0.017} \\pm 0.012,\\\\ \\frac{\\mathcal {B}\\left( {{\\varLambda } ^0_{b}} \\!\\rightarrow {{\\varLambda } ^+_{c}} {{D} ^{*-}_{s}} \\right) }{\\mathcal {B}\\left( {{\\varLambda } ^0_{b}} \\!\\rightarrow {{\\varLambda } ^+_{c}} {{D} ^-_{s}} \\right) }&= 1.668 \\pm 0.022 {}_{-0.055}^{+0.061}, \\end{aligned} \\end{aligned}$$\\end{document}where the first uncertainties are statistical, the second systematic, and the third, for the Λb0→Λc+D¯(∗)0K-\\documentclass[12pt]{minimal} \\usepackage{amsmath} \\usepackage{wasysym} \\usepackage{amsfonts} \\usepackage{amssymb} \\usepackage{amsbsy} \\usepackage{mathrsfs} \\usepackage{upgreek} \\setlength{\\oddsidemargin}{-69pt} \\begin{document}$${{\\varLambda } ^0_{b}} \\!\\rightarrow {{\\varLambda } ^+_{c}} {\\hspace{1.79993pt}\\overline{\\hspace{-1.79993pt}D}} {}^{(*)0}{{K} ^-} $$\\end{document} decays, are due to the uncertainties on the branching fractions of the Ds-→K-K+π-\\documentclass[12pt]{minimal} \\usepackage{amsmath} \\usepackage{wasysym} \\usepackage{amsfonts} \\usepackage{amssymb} \\usepackage{amsbsy} \\usepackage{mathrsfs} \\usepackage{upgreek} \\setlength{\\oddsidemargin}{-69pt} \\begin{document}$${{D} ^-_{s}} \\!\\rightarrow {{K} ^-} {{K} ^+} {{\\pi } ^-} $$\\end{document} and D¯0→K+π-\\documentclass[12pt]{minimal} \\usepackage{amsmath} \\usepackage{wasysym} \\usepackage{amsfonts} \\usepackage{amssymb} \\usepackage{amsbsy} \\usepackage{mathrsfs} \\usepackage{upgreek} \\setlength{\\oddsidemargin}{-69pt} \\begin{document}$${{\\hspace{1.79993pt}\\overline{\\hspace{-1.79993pt}D}} {}^0} \\!\\rightarrow {{K} ^+} {{\\pi } ^-} $$\\end{document} decay modes. The measured branching fractions probe factorization assumptions in effective theories and provide the normalization for future pentaquark searches in Λb0→Λc+D¯(∗)0K-\\documentclass[12pt]{minimal} \\usepackage{amsmath} \\usepackage{wasysym} \\usepackage{amsfonts} \\usepackage{amssymb} \\usepackage{amsbsy} \\usepackage{mathrsfs} \\usepackage{upgreek} \\setlength{\\oddsidemargin}{-69pt} \\begin{document}$${{\\varLambda } ^0_{b}} \\!\\rightarrow {{\\varLambda } ^+_{c}} {\\hspace{1.79993pt}\\overline{\\hspace{-1.79993pt}D}} {}^{(*)0}{{K} ^-} $$\\end{document} decay channels.
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