First observations of D+ to a0(980) rho and D+ to a0(980)+ f0(500) decays are reported with branching fractions and the ratio r+/0 measured as 0.55.
Ablikimet al.(BESIII Collaboration), Nucl
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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.
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.
Flux-averaged cross sections for n-bar p to K+K-pi+ and K+K-pi+pi0 are measured as 0.53 and 1.09 mb using tagged antineutrons from J/psi decays.
BESIII reports 4.4σ evidence for transverse Ξ⁰ polarization in ψ(3686)→Ξ⁰Ξ⁰-bar together with improved measurements of branching fraction, decay amplitudes, and CP observables consistent with no violation.
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}.
citing papers explorer
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First Observation of \boldmath{$D^+ \to a_0(980)\rho$ and $D^+ \to a_0(980)^+ f_0(500)$} in \boldmath{$D^+ \to \pi^+\pi^+\pi^-\eta$ and $D^+ \to \pi^+\pi^0\pi^0\eta$} Decays
First observations of D+ to a0(980) rho and D+ to a0(980)+ f0(500) decays are reported with branching fractions and the ratio r+/0 measured as 0.55.
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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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Cross Section Measurements of $\bar{n}p \rightarrow K^{+}K^{-}\pi^{+}(\pi^{0})$ via Antineutrons Produced by $J/\psi \to p \pi^{-} \bar{n}$ Decays
Flux-averaged cross sections for n-bar p to K+K-pi+ and K+K-pi+pi0 are measured as 0.53 and 1.09 mb using tagged antineutrons from J/psi decays.
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Evidence of transverse polarization of $\Xi^0$ hyperon in $\psi(3686)\rightarrow\Xi^0\bar{\Xi}^0$
BESIII reports 4.4σ evidence for transverse Ξ⁰ polarization in ψ(3686)→Ξ⁰Ξ⁰-bar together with improved measurements of branching fraction, decay amplitudes, and CP observables consistent with no violation.
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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}.