First observation of χ_c1(3872) → J/ψ μ⁺μ⁻ reported at 6.5σ significance with branching fraction ratio (1.68 ± 0.37) × 10^{-3} relative to the π⁺π⁻ mode.
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The paper computes spectroscopic properties, OZI-allowed strong decays, and radiative transitions for the 2D and 1F charmonium states around 4 GeV to guide experimental searches.
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Observation of the decay $\chi_{c1}(3872)\rightarrow J\mskip -3mu/\mskip -2mu\psi \mu^+\mu^-$
First observation of χ_c1(3872) → J/ψ μ⁺μ⁻ reported at 6.5σ significance with branching fraction ratio (1.68 ± 0.37) × 10^{-3} relative to the π⁺π⁻ mode.
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Prospects for observing the missing $2D$ and $1F$ charmonium states around 4 GeV
The paper computes spectroscopic properties, OZI-allowed strong decays, and radiative transitions for the 2D and 1F charmonium states around 4 GeV to guide experimental searches.