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論文

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.*; 谷田 聖; Belle Collaboration*; 他204名*

Physical Review D, 107(3), p.032004_1 - 032004_9, 2023/02

https://doi.org/10.1103/PhysRevD.107.032004
 被引用回数：11 パーセンタイル：63.75(Astronomy & Astrophysics)

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.

論文

Measurement of time-dependent $$CP$$ violation parameters in $$B^{0} to K^{0}_{S}K^{0}_{S}K^{0}_{S}$$ decays at Belle

Kang, K. H.*; 谷田 聖; Belle Collaboration*; 他204名*

Physical Review D, 103(3), p.032003_1 - 032003_8, 2021/02

AA2022-0015.pdf:0.64MB

https://doi.org/10.1103/PhysRevD.103.032003
 被引用回数：3 パーセンタイル：16.25(Astronomy & Astrophysics)

We measure the time-dependent $$C!P$$ violation parameters in $$B^{0} to K^{0}_{S}K^{0}_{S}K^{0}_{S}$$ decays using $$772 times 10^6$$ $$B {mkern 1.5muoverline{mkern-1.5mu B mkern-0.1mu}mkern 0.1mu}$$ pairs collected at the $$Upsilon (4S)$$ resonance with the Belle detector at the KEKB asymmetric-energy $$e^+ e^-$$ collider. The obtained mixing-induced and direct $$C!P$$ asymmetries are $$-0.71 pm 0.23~{rm(stat)} pm 0.05~{rm(syst)}$$ and $$0.12 pm 0.16~{rm(stat)} pm 0.05~{rm(syst)}$$, respectively. These values are consistent with the Standard Model predictions. The significance of $$C!P$$ violation differs from zero by 2.5 standard deviations.

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