Measurements of $\psi (3686)\to K^{-}\Lambda {\bar{\Xi }}^{+}+c.c.$ and $\psi (3686)\to \gamma K^{-}\Lambda {\bar{\Xi }}^{+}+c.c$

Abstract

Using a sample of $1.06\times10^8\ \psip$ events produced in $e^{+}{e}^{-}$ collisions at $\sqrt{s}$ = 3.686 GeV and collected with the BESIII detector at the BEPCII collider, we present studies of the decays $\klx+c.c.$ and $\gklx+c.c.$. We observe two hyperons, $\Xi (1690{)}^{-}$ and $\Xi (1820{)}^{-}$, in the $K^{-}\Lambda$ invariant mass distribution in the decay $\klx+c.c.$ with significances of $4.9\sigma$ and $6.2\sigma$, respectively. The branching fractions of $\klx+c.c.$, $\ksx+c.c.$, $\psip\toγχ_{cJ}\to γK^- Λ\barΞ^+ +c.c.$ $(J=0,1,2)$, and $\psip\to Ξ(1690/1820)^{-} \barΞ^++c.c$ with subsequent decay $\Xi (1690/1820{)}^{-}\to K^{-}\Lambda$ are measured for the first time.

arXiv comment11 pages, 6 figures

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Cited by in corpus (8)

• Evidence of a $J/\psi \Lambda$ structure and observation of excited ${\Xi }^{-}$ states in the ${\Xi }_b^{-}\to J/\psi \Lambda K^{-}$ decay
• $\Xi (1690)$ as a $\bar{K}\Sigma$ molecular state
• Understanding the nature of $\Omega (2012)$ in a coupled-channel approach
• Study of excited $\Xi$ states in $\psi (3686)\to K^{-}\Lambda {\overline{\Xi }}^{+}+c.c.$
• $N^{\ast }$ Production from $e^{+}{e}^{-}$ Annihilations
• Dynamically Generated $\Xi (1690)$
• 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 $J/\psi \to {\Xi }^0{\bar{\Sigma }}^{-}{K}^{+}+c.c.$
• Recent Results on Hadron Spectroscopy from BESIII