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論文

Measurement of the charm-mixing parameter $$y_{CP}$$ in $$D^{0}to K^{0}_{S}omega$$ decays at Belle

Nayak, M.*; 谷田 聖; Belle Collaboration*; 他180名*

Physical Review D, 102(7), p.071102_1 - 071102_8, 2020/10

https://doi.org/10.1103/PhysRevD.102.071102
 被引用回数：6 パーセンタイル：42.3(Astronomy & Astrophysics)

We report the first measurement of the charm-mixing parameter $$y_{CP}$$ in $$D^{0}$$ decays to the $$CP$$-odd final state $$K^{0}_{S}omega$$. The study uses the full Belle $$e^{+}e^-$$ annihilation data sample of $$976rm~ fb^{-1}$$ taken at or near the $$Upsilon(4S)$$ centre-of-mass energy. We find $$y_{CP} = (0.96 pm 0.91 pm 0.61 {}^{+0.17}_{-0.00})%$$, where the first uncertainty is statistical, the second is systematic due to event selection and background, and the last is due to possible presence of $$CP$$-even decays in the data sample.

論文

Study of $$eta$$ and dipion transitions in $$Upsilon(4S)$$ decays to lower bottomonia

Guido, E.*; 谷田 聖; Belle Collaboration*; 他180名*

Physical Review D, 96(5), p.052005_1 - 052005_11, 2017/09

AA2017-0515.pdf:0.99MB

https://doi.org/10.1103/PhysRevD.96.052005
 被引用回数：14 パーセンタイル：57.78(Astronomy & Astrophysics)

We study hadronic transitions between bottomonium states using 496 fb$$^{-1}$$ data collected at the $$Upsilon(4S)$$ resonance with the Belle detector at the KEKB asymmetric energy $$e^+e^-$$ collider. We measure $$B(Upsilon(4S) to pi^+ pi^-Upsilon(1S)) = (8.2 pm 0.5 ({rm stat}) pm 0.4({rm syst})) times 10^{-5}$$, $$B(Upsilon(4S) to pi^+ pi^-Upsilon(2S)) = (7.9 pm 1.0 ({rm stat}) pm 0.4({rm syst})) times 10^{-5}$$, and $$B(Upsilon(4S) to eta Upsilon(1S)) = (1.70 pm 0.23 ({rm stat}) pm 0.08({rm syst})) times 10^{-4}$$. We measure the ratio of branching fractions $$R=B(Upsilon(4S) to eta Upsilon(1S))/B(Upsilon(4S) to pi^+ pi^-Upsilon(1S))=2.07 pm 0.30 ({rm stat}) pm 0.11({rm syst})$$. We search for the decay $$Upsilon(1^3D_{1,2}) to eta Upsilon(1S)$$, but do not find significant evidence for such a transition. We also measure the initial-state radiation production cross sections of the $$Upsilon(2S, 3S)$$ resonances and we find values compatible with the expected ones. Finally, the analysis of the $$Upsilon(4S) to pi^+ pi^-Upsilon(1S)$$ events shows indications for a resonant contribution due to the $$f_0(980)$$ meson.

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