Measurement of the branching fraction for ψ(3770)→γχc0
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By analyzing a data set of lick to view the MathML source">2.92 fb−1 of lick to view the MathML source">e+e collision data taken at View the MathML source and lick to view the MathML source">106.41×106lick to view the MathML source">ψ(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 lick to view the MathML source">ψ(3770)→γχc0 to be lick to view the MathML source">B(ψ(3770)→γχc0)=(6.88±0.28±0.67)×10−3 and lick to view the MathML source">Γ[ψ(3770)→γχc0]=(187±8±19) keV, respectively. These are the most precise measurements to date.

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