Measurement of the inclusive branching fraction for ψ(3686)→KS0+anything

Using 5.9~pb$^{-1}$ of $e^+e^-$ annihilation data collected at center-of-mass energies from 3.640 to 3.701 GeV with the BESIII detector BEPCII Collider, we measure observed cross sections $e^+e^-\rightarrow K_{S}^{0} X$ (where $X= \text{anything}$). From a fit these sum continuum and $\psi(3686)$ $J/\psi$ Breit-Wigner functions considering initial state radiation beam energy spread, obtain for first time product leptonic width inclusive decay branching fraction $\Gamma^{ee}_{\psi(3686)}\mathcal B(\psi(3686)\rightarrow X) = (373.8 \pm 6.7 20.0)$ eV, assuming $\Gamma^{ee}_{\psi(3686)}$ is $(2.33 0.04)$ keV PDG value, $\mathcal (16.04 0.29 0.90)\%$, where uncertainty statistical second systematic.