Measurement of the cross sections of $e^{+}{e}^{-}\to K^{-}{\bar{\Xi }}^{+}\Lambda /{\Sigma }^0$ at center-of-mass energies between 3.510 and 4.914 GeV

Abstract

Using $e^{+}{e}^{-}$ collision data collected with the BESIII detector at the BEPCII collider at center-of-mass energies between 3.510 and 4.914GeV, corresponding to an integrated luminosity of 25 fb${}^{-1}$, we measure the Born cross sections for the process $e^{+}{e}^{-}\to K^{-}{\bar{\Xi }}^{+}\Lambda /{\Sigma }^0$ at thirty-five energy points with a partial-reconstruction strategy. By fitting the dressed cross sections of $e^{+}{e}^{-}\to K^{-}{\bar{\Xi }}^{+}\Lambda /{\Sigma }^0$, evidence for $\psi (4160)\to K^{-}{\bar{\Xi }}^{+}\Lambda$ is found for the first time with a significance of 4.4$\sigma$, 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 $K^{-}{\bar{\Xi }}^{+}\Lambda /{\Sigma }^0$ are determined.

arXiv comment26 pages,5 tables, 4 figures, consistent with the publication in JHEP07(2024)258

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