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Measurement of branching fractions of $$Lambda_c^+to{}pK_S^0K_S^0$$ and $$Lambda_c^+to{}pK_S^0eta$$ at Belle

Li, L. K.*; Tanida, Kiyoshi   ; Belle Collaboration*; 204 of others*

We present a study of a singly Cabibbo-suppressed decay $$Lambda_c^+to{}pK_S^0K_S^0$$ and a Cabibbo-favored decay $$Lambda_c^+to{}pK_S^0eta$$ based on 980 $$rm fb^{-1}$$ of data collected by the Belle detector, operating at the KEKB energy-asymmetric $$e^+e^-$$ collider. We measure their branching fractions relative to $$Lambda_c^+to{}pK_S^0$$: $$mathcal{B}(Lambda_c^+to{}pK_S^0K_S^0)/mathcal{B}(Lambda_c^+to{}pK_S^0)={(1.48 pm 0.08 pm 0.04)times 10^{-2}}$$ and $$mathcal{B}(Lambda_c^+to{}pK_S^0eta)/mathcal{B}(Lambda_c^+to{}pK_S^0)={(2.73pm 0.06pm 0.13)times 10^{-1}}$$. Combining with the world average $$mathcal{B}(Lambda_c^+to{}pK_S^0)$$, we have the absolute branching fractions: $$mathcal{B}(Lambda_c^+to{}pK_S^0K_S^0) = {(2.35pm 0.12pm 0.07 pm 0.12 )times 10^{-4}}$$ and $$mathcal{B}(Lambda_c^+to{}pK_S^0eta) = {(4.35pm 0.10pm 0.20 pm 0.22 )times 10^{-3}}$$. The first and second uncertainties are statistical and systematic, respectively, while the third ones arise from the uncertainty on $$mathcal{B}(Lambda_c^+to{}pK_S^0)$$. The mode $$Lambda_c^+to{}pK_S^0K_S^0$$ is observed for the first time and has a statistical significance of $$>10sigma$$. The branching fraction of $$Lambda_c^+to{}pK_S^0eta$$ has been measured with a threefold improvement in precision over previous results and is found to be consistent with the world average.

Language

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English

Journal

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Physical Review D

Volume

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107

Number

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3

Pages

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p.032004_1 - 032004_9

Publication Year/Month

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2023/02

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Paper URL

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https://doi.org/10.1103/PhysRevD.107.032004

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Keywords

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no keyword

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Press Release

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JAEA R&D Navigator

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Accesses

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- Accesses

InCites™

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Percentile:60.10

Category:Astronomy & Astrophysics

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