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  1. ; ; ; ; ; ; ( , Physical Review Letters)
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  2. ; ; ; ; ; ; ; ; ; ; et al ( , Physical Review D)
    Free, publicly-accessible full text available March 1, 2025
  3. ; ; ; ; ; ; ; ; ; ; et al ( , Physical Review D)
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  4. ; ; ; ; ; ; ; ; ; ; et al ( , Physical Review D)
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  5. ; ; ; ; ; ; ; ; ; ; et al ( , Journal of High Energy Physics)
    A<sc>bstract</sc>

    We report a search for the charged-lepton flavor violation in Υ(2S) →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 ($$ \mathcal{B} $$B) at 90% confidence level. We obtain the most stringent upper limits:$$ \mathcal{B} $$B(Υ(2S)→ μ∓τ±)<0.23×10−6and$$ \mathcal{B} $$B(Υ(2S)→ e∓τ±)<1.12×10−6.

     
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    Free, publicly-accessible full text available February 1, 2025
  6. ; ; ; ; ; ; ; ; ; ; et al ( , Physical Review D)
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  7. ; ; ; ; ; ; ; ; ; ; et al ( , Physical Review Letters)
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  8. ; ; ; ; ; ; ; ; ; ; et al ( , Physical Review D)
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  10. ; ; ; ; ; ; ; ; ; ; et al ( , Physical Review D)

    We measure the branching fraction of the decayB−→D0ρ(770)−using data collected with the Belle II detector. The data contain 387 millionBB¯pairs produced ine+e−collisions at theϒ(4S)resonance. We reconstruct8360±180decays from an analysis of the distributions of theB−energy 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