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.
2024
Settore FIS/01 - Fisica Sperimentale
Settore PHYS-01/A - Fisica sperimentale delle interazioni fondamentali e applicazioni
Accelerator Physics; Complement Cascade; Decay Processes; Low- and highly-charged ions; Experimental Nuclear Physics; Nuclear Physics
   European Public Local Authorities’ Network for driving the Energy Transition
   ePLANET
   European Commission
   Horizon 2020 Framework Programme
   101032450
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11384/157143
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