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A bstract We report a search for the charged-lepton flavor violation in Υ(2
S ) →ℓ ∓τ ± (ℓ =e, μ ) decays using a 25 fb− 1Υ(2S ) sample collected by the Belle detector at the KEKBe +e − asymmetric-energy collider. We find no evidence for a signal and set upper limits on the branching fractions ( ) at 90% confidence level. We obtain the most stringent upper limits:$$ \mathcal{B} $$ (Υ(2$$ \mathcal{B} $$ S )→ μ ∓τ ± )< 0. 23× 10− 6and (Υ(2$$ \mathcal{B} $$ S )→ e ∓τ ± )< 1. 12× 10− 6.Free, publicly-accessible full text available February 1, 2025 -
Free, publicly-accessible full text available December 1, 2024
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Free, publicly-accessible full text available December 1, 2024
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A bstract We measure the cross section of
e +e − →η c J/ψ at 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 fb− 1. We also search for double charmonium production ine +e − →η c J/ψ via initial state radiation near theη c J/ψ threshold. No evident signal of the double charmonium state is found, but evidence for thee +e − → η c J/ψ process is found with a statistical significance greater than 3. 3σ near theη c J/ψ threshold. The average cross section near the threshold is measured and upper limits of cross sections are set for other regions. -
A bstract We report the first measurement of the inclusive
e +e − → $$ b\overline{b} $$ → $$ {D}_s^{\pm } $$ X ande +e − → $$ b\overline{b} $$ → D 0/ $$ {\overline{D}}^0 $$ X cross sections in the energy range from 10. 63 to 11. 02 GeV. Based on these results, we determineσ (e +e − → $$ {B}_s^0{\overline{B}}_s^0 $$ X ) andσ (e +e − → $$ B\overline{B} $$ X ) in the same energy range. We measure the fraction of events at Υ(10860) to be$$ {B}_s^0 $$ f s= ( )%. We determine also the ratio of the$$ {22.0}_{-2.1}^{+2.0} $$ inclusive branching fractions$$ {B}_s^0 $$ ($$ \mathcal{B} $$ $$ {B}_s^0 $$ → D 0/ $$ {\overline{D}}^0 $$ X )/ ($$ \mathcal{B} $$ $$ {B}_s^0 $$ → $$ {D}_s^{\pm } $$ X ) = 0. 416 ± 0. 018 ± 0. 092. The results are obtained using the data collected with the Belle detector at the KEKB asymmetric-energye +e − collider. -
We report a measurement of decay-time-dependent charge-parity () asymmetries indecays. We usepairs collected at theresonance with the Belle II detector at the SuperKEKB asymmetric-energy electron-positron collider. We reconstruct 220 signal events and extract the-violating parametersandfrom a fit to the distribution of the decay-time difference between the twomesons. The resulting confidence region is consistent with previous measurements inanddecays and with predictions based on the standard model.
Published by the American Physical Society 2024 Free, publicly-accessible full text available June 1, 2025