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論文

Search for $$B^0$$ meson decays into $$Lambda$$ and missing energy with a hadronic tagging method at Belle

Hadjivasiliou, C.*; 谷田 聖; Belle Collaboration*; 他166名*

Physical Review D, 105(5), p.L051101_1 - L051101_8, 2022/03

https://doi.org/10.1103/PhysRevD.105.L051101
 被引用回数：8 パーセンタイル：53.96(Astronomy & Astrophysics)

We present a search for the decays of $$B^0$$ mesons into a final state containing a $$Lambda$$ baryon and missing energy. These results are obtained from a 711 fb$$^{-1}$$ data sample that contains 772 $$times$$10$$^{6}$$ $$B$$$$overline{B}$$ pairs and was collected near the $$Upsilon(4S)$$ resonance with the Belle detector at the KEKB asymmetric-energy $$e^+e^-$$ collider. We use events in which one $$B$$ meson is fully reconstructed in a hadronic decay mode and require the remainder of the event to consist of only a single $$Lambda$$. No evidence for these decays is found and we set 90% confidence level upper limits on the branching fractions in the range 2.1-3.8 $$times$$ 10$$^{-5}$$. This measurement provides the world's most restrictive limits, with implications for baryogenesis and dark matter production.

論文

First measurement of the CKM angle $$phi_3$$ with $$B^{pm}to D(K_{rm S}^0pi^+pi^-pi^0)K^{pm}$$ decays

Resmi, P. K.*; 谷田 聖; Belle Collaboration*; 他166名*

Journal of High Energy Physics (Internet), 2019(10), p.178_1 - 178_27, 2019/10

https://doi.org/10.1007/JHEP10(2019)178
 被引用回数：0 パーセンタイル：0.00(Physics, Particles & Fields)

We present the first model-independent measurement of the CKM unitarity triangle angle $$phi_3$$ using $$B^{pm}to D(K_{rm S}^0pi^+pi^-pi^0)K^{pm}$$ decays, where $$D$$ indicates either a $$D^{0}$$ or $$overline{D}^{0}$$ meson. Measurements of the strong-phase difference of the $$D to K_{rm S}^0pi^+pi^-pi^0$$ amplitude obtained from CLEO-c data are used as input. This analysis is based on the full Belle data set of $$772times 10^{6}$$ $$Boverline{B}$$ events collected at the $$Upsilon(4S)$$ resonance. We obtain $$phi_3 = (5.7~^{+10.2}_{-8.8} pm 3.5 pm 5.7)^{circ}$$ and the suppressed amplitude ratio $$r_{B} = 0.323 pm 0.147 pm 0.023 pm 0.051$$. Here the first uncertainty is statistical, the second is the experimental systematic, and the third is due to the precision of the strong-phase parameters measured from CLEO-c data. The 95% confidence interval on $$phi_3$$ is $$(-29.7,~109.5)^{circ}$$, which is consistent with the current world average.

論文

Energy scan of the $$e^+e^- to h_b(nP) pi^+pi^-$$ $$(n=1,2)$$ cross sections and evidence for $$Upsilon(11020)$$ decays into charged bottomoniumlike states

Mizuk, R.*; 谷田 聖; Belle Collaboration*; 他166名*

Physical Review Letters, 117(14), p.142001_1 - 142001_7, 2016/09

AA2016-0386.pdf:0.36MB

https://doi.org/10.1103/PhysRevLett.117.142001
 被引用回数：8 パーセンタイル：50.31(Physics, Multidisciplinary)

Using data collected with the Belle detector at the KEKB asymmetric-energy $$e^+e^-$$ collider, we measure the energy dependence of the $$e^+e^- to h_b(nP) pi^+pi^-$$ $$(n=1,2)$$ cross sections from thresholds up to 11.02 GeV. We find clear $$Upsilon(10860)$$ and $$Upsilon(11020)$$ peaks with little or no continuum contribution. We study the resonant substructure of the $$Upsilon(11020) to h_b(nP) pi^+pi^-$$ transitions and find evidence that they proceed entirely via the intermediate isovector states $$Z_b(10610)$$ and $$Z_b(10650)$$. The relative fraction of these states is loosely constrained by the current data: The hypothesis that only $$Z_b(10610)$$ is produced is excluded at the level of 3.3 standard deviations, while the hypothesis that only $$Z_b(10650)$$ is produced is not excluded at a significant level.

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