Observation of Λ0 b→ Λ+ c D(∗)0K− and Λ0 b→ Λ+ c D∗− s decays
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10052_2024_Article_12752.pdf
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Author(s)
Aaij, R.
Abdelmotteleb, A. S. W.
Beteta, C. Abellan
Abudinén, F.
Ackernley, T.
Adeva, B.
Adinolfi, M.
Adlarson, P.
Agapopoulou, C.
Aidala, C. A.
Date Issued
June 5, 2024
Journal
The European Physical Journal C
Publisher
Springer Science and Business Media LLC
Citation
LHCb Collaboration. Observation of Λ0𝑏→Λ+𝑐𝐷⎯⎯⎯⎯(∗)0𝐾− and Λ0𝑏→Λ+𝑐𝐷∗−𝑠 decays. Eur. Phys. J. C 84, 575 (2024).
Version
Final published version
Abstract
The decays Λ0𝑏→Λ+𝑐𝐷⎯⎯⎯⎯(∗)0𝐾− and Λ0𝑏→Λ+𝑐𝐷∗−𝑠 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 Λ0𝑏→Λ+𝑐𝐷−𝑠 mode are measured to be
(Λ0𝑏→Λ+𝑐𝐷⎯⎯⎯⎯0𝐾−)(Λ0𝑏→Λ+𝑐𝐷−𝑠)(Λ0𝑏→Λ+𝑐𝐷⎯⎯⎯⎯∗0𝐾−)(Λ0𝑏→Λ+𝑐𝐷−𝑠)(Λ0𝑏→Λ+𝑐𝐷∗−𝑠)(Λ0𝑏→Λ+𝑐𝐷−𝑠)=0.1908+0.0036−0.0034+0.0016−0.0018±0.0038,=0.589+0.018−0.017+0.017−0.018±0.012,=1.668±0.022+0.061−0.055,
where the first uncertainties are statistical, the second systematic, and the third, for the Λ0𝑏→Λ+𝑐𝐷⎯⎯⎯⎯(∗)0𝐾− decays, are due to the uncertainties on the branching fractions of the 𝐷−𝑠→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 Λ0𝑏→Λ+𝑐𝐷⎯⎯⎯⎯(∗)0𝐾− decay channels.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
10.1140/epjc/s10052-024-12752-3
