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  4. A<sc>bstract</sc>

    We report a search for the charged-lepton flavor violation in Υ(2S) →τ±(=e, μ) decays using a 25 fb1Υ(2S) sample collected by the Belle detector at the KEKBe+easymmetric-energy collider. We find no evidence for a signal and set upper limits on the branching fractions ($$ \mathcal{B} $$B) at 90% confidence level. We obtain the most stringent upper limits:$$ \mathcal{B} $$B(Υ(2S)→ μτ±)<0.23×106and$$ \mathcal{B} $$B(Υ(2S)→ eτ±)<1.12×106.

     
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    Free, publicly-accessible full text available February 1, 2025
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  7. A<sc>bstract</sc>

    We measure the cross section ofe+eηcJ/ψat the Υ(nS)(n= 1–5) on-resonance and 10.52 GeV off-resonance energy points using the full data sample collected by the Belle detector with an integrated luminosity of 955 fb1. We also search for double charmonium production ine+eηcJ/ψvia initial state radiation near theηcJ/ψthreshold. No evident signal of the double charmonium state is found, but evidence for thee+e→ ηcJ/ψprocess is found with a statistical significance greater than 3.3σnear theηcJ/ψthreshold. The average cross section near the threshold is measured and upper limits of cross sections are set for other regions.

     
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  8. A<sc>bstract</sc>

    We report the first measurement of the inclusivee+e$$ b\overline{b} $$bb¯$$ {D}_s^{\pm } $$Ds±Xande+e$$ b\overline{b} $$bb¯→ D0/$$ {\overline{D}}^0 $$D¯0Xcross sections in the energy range from 10.63 to 11.02 GeV. Based on these results, we determineσ(e+e$$ {B}_s^0{\overline{B}}_s^0 $$Bs0B¯s0X) andσ(e+e$$ B\overline{B} $$BB¯X) in the same energy range. We measure the fraction of$$ {B}_s^0 $$Bs0events at Υ(10860) to befs= ($$ {22.0}_{-2.1}^{+2.0} $$22.02.1+2.0)%. We determine also the ratio of the$$ {B}_s^0 $$Bs0inclusive branching fractions$$ \mathcal{B} $$B($$ {B}_s^0 $$Bs0→ D0/$$ {\overline{D}}^0 $$D¯0X)/$$ \mathcal{B} $$B($$ {B}_s^0 $$Bs0$$ {D}_s^{\pm } $$Ds±X) = 0.416 ± 0.018 ± 0.092. The results are obtained using the data collected with the Belle detector at the KEKB asymmetric-energye+ecollider.

     
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  9. We report a measurement of decay-time-dependent charge-parity (CP) asymmetries inB0KS0KS0KS0decays. We use387×106BB¯pairs collected at theϒ(4S)resonance with the Belle II detector at the SuperKEKB asymmetric-energy electron-positron collider. We reconstruct 220 signal events and extract theCP-violating parametersSandCfrom a fit to the distribution of the decay-time difference between the twoBmesons. The resulting confidence region is consistent with previous measurements inB0KS0KS0KS0andB0(cc¯)K0decays and with predictions based on the standard model.

    Published by the American Physical Society2024 
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    Free, publicly-accessible full text available June 1, 2025