Measurement of the branching fraction for ψ(3770)→γχc0
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By analyzing a data set of 2.92 fb−1 of e+e collision data taken at View the MathML source and 106.41×106ψ(3686) decays taken at View the MathML source with the BESIII detector at the BEPCII collider, we measure the branching fraction and the partial decay width for ψ(3770)→γχc0 to be B(ψ(3770)→γχc0)=(6.88±0.28±0.67)×10−3 and Γ[ψ(3770)→γχc0]=(187±8±19) keV, respectively. These are the most precise measurements to date.

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