First observation of Λ(1520)→γΣ⁰ and Λ(1670)→γΣ⁰ decays with branching fraction measurements that agree with SU(3) symmetry but disagree with some quark model predictions.
Ablikimet al.(BESIII Collaboration), Phys
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BESIII reports first observation of a threshold enhancement in the π⁺π⁻ mass spectrum from ψ(3686)→π⁺π⁻J/ψ with fitted mass 285.6±2.5 MeV/c², width 16.3±0.9 MeV and >10σ significance.
The absolute branching fractions B(Xi(1530)^- to Xi^0 pi^-) = 61.4% and B(Xi(1530)^- to Xi^- pi^0) = 29.7% are measured for the first time, with their sum 91.1%, and B(psi(3686) to anti-Xi+ Xi(1530)^- + c.c.) is updated to 8.67 x 10^{-6}.
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.
The branching fraction of η → e⁺e⁻e⁺e⁻ is measured to be (2.63 ± 0.34_stat ± 0.16_syst) × 10^{-5}.
BESIII reports the first observation of the exotic π₁(1600) state in χ_c1 decays from ψ(2S) with >21σ significance, measuring mass 1828 MeV/c², width 638 MeV, and product branching fraction 4.30×10^{-4}.
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Observation of the electromagnetic radiative decays of the \boldmath{$\Lambda(1520)$} and \boldmath{$\Lambda(1670)$} to \boldmath{$\gamma\Sigma^0$}
First observation of Λ(1520)→γΣ⁰ and Λ(1670)→γΣ⁰ decays with branching fraction measurements that agree with SU(3) symmetry but disagree with some quark model predictions.
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Observation of a threshold enhancement in the $\pi^+\pi^-$ spectrum in $\psi(3686) \rightarrow \pi^{+}\pi^{-}J/\psi$ decays
BESIII reports first observation of a threshold enhancement in the π⁺π⁻ mass spectrum from ψ(3686)→π⁺π⁻J/ψ with fitted mass 285.6±2.5 MeV/c², width 16.3±0.9 MeV and >10σ significance.
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Measurement of the Absolute Branching Fraction of Xi(1530)^{-} to (Xi pi)^{-} and Updated Measurement of the Branching Fraction of psi(3686) to anti-Xi^{+} Xi(1530)^{-} + c.c
The absolute branching fractions B(Xi(1530)^- to Xi^0 pi^-) = 61.4% and B(Xi(1530)^- to Xi^- pi^0) = 29.7% are measured for the first time, with their sum 91.1%, and B(psi(3686) to anti-Xi+ Xi(1530)^- + c.c.) is updated to 8.67 x 10^{-6}.
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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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Measurement of the double Dalitz decay $\eta \to e^+e^-e^+e^-$
The branching fraction of η → e⁺e⁻e⁺e⁻ is measured to be (2.63 ± 0.34_stat ± 0.16_syst) × 10^{-5}.
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Observation of the Exotic State $\pi_{1}(1600)$ in $\psi(2S)\rightarrow\gamma\chi_{c1},\chi_{c1}\rightarrow\pi^{+}\pi^{-}\eta'$
BESIII reports the first observation of the exotic π₁(1600) state in χ_c1 decays from ψ(2S) with >21σ significance, measuring mass 1828 MeV/c², width 638 MeV, and product branching fraction 4.30×10^{-4}.