Observation of the decay ${\chi }_{cJ}\to {\Omega }^{-}{\bar{\Omega }}^{+}$

Abstract

Using an $e^{+}{e}^{-}$ collision data sample of $(27.08\pm 0.14)\times 10^8$ $\psi (3686)$ events collected by the BESIII detector, we report the first observation of ${\chi }_{cJ}\to {\Omega }^{-}{\bar{\Omega }}^{+}$ ($J=0,1,2$) decays with significances of $5.6\sigma$, $6.4\sigma$, and $18\sigma$, respectively, where the ${\chi }_{cJ}$ mesons are produced in the radiative $\psi (3686)$ decays. The branching fractions are determined to be $\mathcal{B}({\chi }_{c0}\to {\Omega }^{-}{\bar{\Omega }}^{+})=(3.51\pm 0.54\pm 0.29)\times 10^{-5}$, $\mathcal{B}({\chi }_{c1}\to {\Omega }^{-}{\bar{\Omega }}^{+})=(1.49\pm 0.23\pm 0.10)\times 10^{-5}$, and $\mathcal{B}({\chi }_{c2}\to {\Omega }^{-}{\bar{\Omega }}^{+})=(4.52\pm 0.24\pm 0.18)\times 10^{-5}$, where the first and second uncertainties are statistical and systematic, respectively.

References in corpus (7)

• Method for detector description transformation to Unity and application in BESIII
• Weak phases and CP-symmetry tests in sequential decays of entangled double-strange baryons
• Precise Measurements of Decay Parameters and $CP$ Asymmetry with Entangled $\Lambda -\bar{\Lambda }$ Pairs
• ${\Sigma }^{+}$ and ${\bar{\Sigma }}^{-}$ polarization in the $J/\psi$ and $\psi (3686)$ decays
• The evasion of helicity selection rule in ${\chi }_{c1}\to VV$ and ${\chi }_{c2}\to VP$ via intermediate charmed meson loops
• Improved measurements of two-photon widths of the ${\chi }_{cJ}$ states and helicity analysis for ${\chi }_{c2}\to \gamma \gamma$
• Observation of the decays ${\chi }_{cJ}\to \varphi \varphi \eta$

Cited by in corpus (3)

• Strong and weak $CP$ tests in sequential decays of polarized ${\Sigma }^0$ hyperons
• Measurements of charmonia decays from BESIII
• Helicity amplitude and branching fraction measurement of ${\chi }_{cJ}\to \Lambda \bar{\Lambda }$