BESIII reports the first measurement of B(Ds+ → K0 μ+ νμ) = (2.89 ± 0.27stat ± 0.12syst) × 10^{-3} and extracts f^{K0}_+(0) = 0.623 ± 0.036stat ± 0.009syst and |Vcd| = 0.220 ± 0.013stat ± 0.003syst ± 0.001LQCD from 7.33 fb^{-1} of data.
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The relative branching fraction B(phi → K_S0 K_L0)/B(phi → K+ K-) is measured as 0.628 ± 0.022 ± 0.015 ± 0.017, consistent with isospin symmetry.
First absolute branching fractions for Σ⁺ → p π⁰ and Σ⁺ → n π⁺ measured at 49.79% and 49.87%, deviating from PDG values and showing >5σ evidence for ΔI=3/2 amplitudes.
First amplitude analysis of J/ψ→γ p p-bar in the η_c region yields product branching fraction (2.11±0.02 stat ±0.07 syst)×10^{-5}, enabling derivation of B(J/ψ→γ η_c)=(2.29±0.01±0.04±0.18)% and B(η_c→γγ)=(2.28±0.01±0.04±0.18)×10^{-4} consistent with lattice QCD.
No signals found for X(3872) to K_S^0 K^± π^∓ or K*(892) K-bar; upper limits on branching fractions relative to π+π- J/ψ are <0.07 and <0.10 at 90% CL.
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First Measurement of the $D_s^+\rightarrow K^0\mu^+\nu_{\mu}$ Decay
BESIII reports the first measurement of B(Ds+ → K0 μ+ νμ) = (2.89 ± 0.27stat ± 0.12syst) × 10^{-3} and extracts f^{K0}_+(0) = 0.623 ± 0.036stat ± 0.009syst and |Vcd| = 0.220 ± 0.013stat ± 0.003syst ± 0.001LQCD from 7.33 fb^{-1} of data.
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Study of $\phi\to K\bar{K}$ in the amplitude analysis of $D^{+}\to K_{S}^{0}K_{L}^{0}\pi^{+}$
The relative branching fraction B(phi → K_S0 K_L0)/B(phi → K+ K-) is measured as 0.628 ± 0.022 ± 0.015 ± 0.017, consistent with isospin symmetry.
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First measurement of the absolute branching fractions of $\Sigma^+$ nonleptonic decays and test of the $\Delta I = 1/2$ rule
First absolute branching fractions for Σ⁺ → p π⁰ and Σ⁺ → n π⁺ measured at 49.79% and 49.87%, deviating from PDG values and showing >5σ evidence for ΔI=3/2 amplitudes.
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Study of the Magnetic Dipole Transition of $J/\psi\to\gamma\eta_c$ via $\eta_c\to p\bar{p}$
First amplitude analysis of J/ψ→γ p p-bar in the η_c region yields product branching fraction (2.11±0.02 stat ±0.07 syst)×10^{-5}, enabling derivation of B(J/ψ→γ η_c)=(2.29±0.01±0.04±0.18)% and B(η_c→γγ)=(2.28±0.01±0.04±0.18)×10^{-4} consistent with lattice QCD.
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Search for the decays $X(3872)\to K_{S}^{0}K^{\pm}\pi^{\mp}$ and $K^*(892)\bar{K}$ at BESIII
No signals found for X(3872) to K_S^0 K^± π^∓ or K*(892) K-bar; upper limits on branching fractions relative to π+π- J/ψ are <0.07 and <0.10 at 90% CL.