The decays Λb0→Λc+D¯(∗)0K- and Λb0→Λc+Ds∗- are observed for the first time, in proton-proton collision data at s=13TeV, corresponding to an integrated luminosity of 5.4fb-1 collected with the LHCb detector. Their ratios of branching fractions with respect to the Λb0→Λc+Ds- mode are measured to be (Formula presented.) where the first uncertainties are statistical, the second systematic, and the third, for the Λb0→Λc+D¯(∗)0K- decays, are due to the uncertainties on the branching fractions of the Ds-→K-K+π- and D¯0→K+π- 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- decay channels.
Observation of Lambdab0 -> Lambdac+ D(*)0K- and Lambdab0 -> Lambdac+ Ds*- decays
Bassi G.Membro del Collaboration Group
;Kleijne N.Membro del Collaboration Group
;Morello M. J.Membro del Collaboration Group
;Passaro D.Membro del Collaboration Group
;Pica L.Membro del Collaboration Group
;Ribatti R.Membro del Collaboration Group
;Riccardi D.Membro del Collaboration Group
;
2024
Abstract
The decays Λb0→Λc+D¯(∗)0K- and Λb0→Λc+Ds∗- are observed for the first time, in proton-proton collision data at s=13TeV, corresponding to an integrated luminosity of 5.4fb-1 collected with the LHCb detector. Their ratios of branching fractions with respect to the Λb0→Λc+Ds- mode are measured to be (Formula presented.) where the first uncertainties are statistical, the second systematic, and the third, for the Λb0→Λc+D¯(∗)0K- decays, are due to the uncertainties on the branching fractions of the Ds-→K-K+π- and D¯0→K+π- 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- decay channels.| File | Dimensione | Formato | |
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s10052-024-12752-3.pdf
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