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  1. Free, publicly-accessible full text available February 1, 2025
  2. Free, publicly-accessible full text available February 1, 2025
  3. 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
  4. Free, publicly-accessible full text available December 1, 2024
  5. Free, publicly-accessible full text available December 1, 2024
  6. We measure the branching fraction of the decayBD0ρ(770)using data collected with the Belle II detector. The data contain 387 millionBB¯pairs produced ine+ecollisions at theϒ(4S)resonance. We reconstruct8360±180decays from an analysis of the distributions of theBenergy and theρ(770)helicity angle. We determine the branching fraction to be(0.939±0.021(stat)±0.050(syst))%, in agreement with previous results. Our measurement improves the relative precision of the world average by more than a factor of two.

    Published by the American Physical Society2024 
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    Free, publicly-accessible full text available June 1, 2025
  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. We measure the tau-to-light-lepton ratio of inclusiveB-meson branching fractionsR(Xτ/)B(BXτν)/B(BXν), whereindicates an electron or muon, and thereby test the universality of charged-current weak interactions. We select events that have one fully reconstructedBmeson and a charged lepton candidate from189fb1of electron-positron collision data collected with the Belle II detector. We findR(Xτ/)=0.228±0.016(stat)±0.036(syst), in agreement with standard-model expectations. This is the first direct measurement ofR(Xτ/).

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