Study of excited $\Xi$ states in $\psi (3686)\to K^{-}\Lambda {\overline{\Xi }}^{+}+c.c.$

Abstract

Based on a sample of $(448.1\pm 2.9)\times 10^6$ $\psi (3686)$ events collected with the BESIII detector at BEPCII, the decays of $\psi (3686)\to K^{-}\Lambda {\overline{\Xi }}^{+}+c.c.$ with ${\overline{\Xi }}^{+}\to \overline{\Lambda }{\pi }^{+}$, $\overline{\Lambda }\to \overline{p}{\pi }^{+}$ are studied.Two excited hyperons, $\Xi (1690{)}^{-}$ and $\Xi (1820{)}^{-}$, are observed with large significance ($\gg 10\sigma$) in the $K^{-}\Lambda$ invariant mass distributions. A partial wave analysis is performed, and the spin-parities of $\Xi (1690{)}^{-}$ and $\Xi (1820{)}^{-}$ are determined to be ${\frac{1}{2}}^{-}$ and ${\frac{3}{2}}^{-}$, respectively. The masses, widths, and product branching fractions of $\Xi (1690{)}^{-}$ and $\Xi (1820{)}^{-}$ are also measured.

arXiv comment12 paes, 4 figures

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• Determination of the number of $\psi (3686)$ events at BESIII
• Study of $\psi$ decays to the ${\Xi }^{-}{\bar{\Xi }}^{+}$ and $\Sigma (1385{)}^{\mp }\bar{\Sigma }(1385{)}^{\pm }$ final states
• Measurement of the Spin of the Xi(1530) Resonance
• Nucleon pole contributions in $J/\psi \to N\bar{N}\pi$, $p\bar{p}\eta$, $p\bar{p}{\eta }^{\prime }$ and $p\bar{p}\omega$ decays
• Measurements of $\psi (3686)\to K^{-}\Lambda {\bar{\Xi }}^{+}+c.c.$ and $\psi (3686)\to \gamma K^{-}\Lambda {\bar{\Xi }}^{+}+c.c$

Cited by in corpus (3)

• 70 Years of Hyperon Spectroscopy: A review of strange $\Xi$, $\Omega$ baryons, and the spectrum of charmed and bottom baryons
• First measurements of the branching fractions of $J/\psi \to {\Xi }^0\bar{\Lambda }{K}_S^0+c.c.$, $J/\psi \to {\Xi }^0{\bar{\Sigma }}^0{K}_S^0+c.c.$, and $J/\psi \to {\Xi }^0{\bar{\Sigma }}^{-}{K}^{+}+c.c.$
• Monte Carlo Simulation-Based Partial Wave Analysis of ${\Xi }_c^{+}\to {\Xi }^{-}{\pi }^{+}{\pi }^{+}$ Decay