HG
Han Gao
Author with expertise in Particle Physics and High-Energy Collider Experiments
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Measurement of the cross sections of $$ {e}^{+}{e}^{-}\to {K}^{-}{\overline{\Xi}}^{+}\Lambda /{\Sigma}^0 $$ at center-of-mass energies between 3.510 and 4.914 GeV

Wei Wang et al.Jul 26, 2024
A bstract Using e + e − collision data collected with the BESIII detector at the BEPCII collider at center-of-mass energies between 3.510 and 4.914 GeV, corresponding to an integrated luminosity of 25 fb − 1 , we measure the Born cross sections for the process $$ {e}^{+}{e}^{-}\to {K}^{-}{\overline{\Xi}}^{+}\Lambda /{\Sigma}^0 $$  e +   e −  →  K −   Ξ ¯ +  Λ /  Σ 0  at thirty-five energy points with a partial-reconstruction strategy. By fitting the dressed cross sections of $$ {e}^{+}{e}^{-}\to {K}^{-}{\overline{\Xi}}^{+}\Lambda /{\Sigma}^0 $$  e +   e −  →  K −   Ξ ¯ +  Λ /  Σ 0  , evidence for $$ \psi (4160)\to {K}^{-}{\overline{\Xi}}^{+}\Lambda $$ ψ  4160  →  K −   Ξ ¯ +  Λ is found for the first time with a significance of 4.4 σ , including systematic uncertainties. No evidence for other possible resonances is found. In addition, the products of electronic partial width and branching fraction for all assumed resonances decaying into $$ {K}^{-}{\overline{\Xi}}^{+}\Lambda /{\Sigma}^0 $$  K −   Ξ ¯ +  Λ /  Σ 0  are determined.
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