Measurement of cross sections of $$ {e}^{+}{e}^{-}\to {K}_S^0{K}_S^0\psi (3686) $$ from $$ \sqrt{s} $$ = 4.682 to 4.951 GeV

A bstract The process $$ {e}^{+}{e}^{-}\to {K}_S^0{K}_S^0\psi (3686) $$ e + e − → K S 0 K S 0 ψ 3686 is studied by analyzing e + e − collision data samples collected at eight center-of-mass energies ranging from 4.682 to 4.951 GeV with the BESIII detector operating at the BEPCII collider, corresponding to an integrated luminosity of 4 . 1 fb − 1 . Observation of the $$ {e}^{+}{e}^{-}\to {K}_S^0{K}_S^0\psi (3686) $$ e + e − → K S 0 K S 0 ψ 3686 process is found for the first time with a statistical significance of 6 . 3 σ , and the cross sections at each center-of-mass energy are measured. The ratio of cross sections of $$ {e}^{+}{e}^{-}\to {K}_S^0{K}_S^0\psi (3686) $$ e + e − → K S 0 K S 0 ψ 3686 relative to e + e − → K + K − ψ (3686) is determined to be $$ \frac{\sigma \left({e}^{+}{e}^{-}\to {K}_S^0{K}_S^0\psi (3686)\right)}{\sigma \left({e}^{+}{e}^{-}\to {K}^{+}{K}^{-}\psi (3686)\right)}=0.45\pm 0.25 $$ σ e + e − → K S 0 K S 0 ψ 3686 σ e + e − → K + K − ψ 3686 = 0.45 ± 0.25 , which is consistent with the prediction based on isospin symmetry. The uncertainty includes both statistical and systematic contributions. Additionally, the

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