Measurement of {\boldmath $J/\psi \to \Xi (1530{)}^{-}{\bar{\Xi }}^{+}$} and evidence for the radiative decay {\boldmath $\Xi (1530{)}^{-}\to \gamma {\Xi }^{-}$}

Abstract

The SU(3)-flavor violating decay $J/\psi \to \Xi (1530{)}^{-}{\bar{\Xi }}^{+}+c.c.$ is studied using $(1310.6\pm 7.0)\times 10^{6}J/\psi$ events collected with the BESIII detector at BEPCII and the branching fraction is measured to be $\mathcal{B}(J/\psi \to \Xi (1530{)}^{-}{\bar{\Xi }}^{+}+c.c.)=(3.17\pm 0.02_{stat.}\pm 0.08_{syst.})\times 10^{-4}$. This is consistent with previous measurements with an improved precision. The angular parameter for this decay is measured for the first time and is found to be $\alpha =-0.21\pm 0.04_{stat.}\pm 0.06_{syst.}$. In addition, we report evidence for the radiative decay $\Xi (1530{)}^{-}\to \gamma {\Xi }^{-}$ with a significance of 3.9$\sigma$, including the systematic uncertainties. The 90\% confidence level upper limit on the branching fraction is determined to be $\mathcal{B}(\Xi (1530{)}^{-}\to \gamma {\Xi }^{-})\le 3.7$\%.

arXiv comment10 pages, 7 figures

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Cited by in corpus (5)

• Measurements of the branching fractions of $\psi (3686)\to {\bar{\Sigma }}^0\Lambda +c.c.$ and ${\chi }_{cJ(J=0,1,2)}\to \Lambda \bar{\Lambda }$
• A covariant model for the decuplet to octet Dalitz decays
• Observation of $\psi (3686)\to \Xi (1530{)}^0\bar{\Xi }(1530{)}^0$ and $\Xi (1530{)}^0{\bar{\Xi }}^0$
• Meson cloud contributions to the Dalitz decays of decuplet to octet baryons
• Symmetry analysis of charmonium two-body decay