Observation of ${\chi }_{c2}\to {\eta }^{\prime }{\eta }^{\prime }$ and ${\chi }_{c0,2}\to \eta {\eta }^{\prime }$

Abstract

Using a sample of $447.9\times 10^6$ $\psi (3686)$ events collected with the BESIII detector in 2009 and 2012, we study the decays ${\chi }_{c0,2}\to$ ${\eta }^{\prime }{\eta }^{\prime }$ and $\eta {\eta }^{\prime }$. The decays ${\chi }_{c2}\to {\eta }^{\prime }{\eta }^{\prime }$, ${\chi }_{c0}\to \eta {\eta }^{\prime }$ and ${\chi }_{c2}\to \eta {\eta }^{\prime }$ are observed for the first time with statistical significances of $9.6\sigma$, $13.4\sigma$ and $7.5\sigma$, respectively. The branching fractions are determined to be $\mathcal{B}({\chi }_{c0}\to {\eta }^{\prime }{\eta }^{\prime })=(2.19\pm 0.03\pm 0.14)\times 10^{-3}$, $\mathcal{B}({\chi }_{c2}\to {\eta }^{\prime }{\eta }^{\prime })=(4.76\pm 0.56\pm 0.38)\times 10^{-5}$, $\mathcal{B}({\chi }_{c0}\to \eta {\eta }^{\prime })=(8.92\pm 0.84\pm 0.65)\times 10^{-5}$ and $\mathcal{B}({\chi }_{c2}\to \eta {\eta }^{\prime })=(2.27\pm 0.43\pm 0.25)\times 10^{-5}$, where the first uncertainties are statistical and the second systematic. The precision for the measurement of $\mathcal{B}({\chi }_{c0}\to {\eta }^{\prime }{\eta }^{\prime })$ is significantly improved compared to previous measurements. Based on the measured branching fractions, the role played by the doubly and singly Okubo-Zweig-Iizuka disconnected transition amplitudes for ${\chi }_{c0,2}$ decays into pseudoscalar meson pairs can be clarified.

arXiv comment7 pages, 3 figures

References in corpus (15)

• Design and Construction of the BESIII Detector
• The Precision Monte Carlo Event Generator KK For Two-Fermion Final States In e+e- Collisions
• Coherent Exclusive Exponentiation For Precision Monte Carlo Calculations
• Search for hadronic transition ${\chi }_{cJ}\to {\eta }_c{\pi }^{+}{\pi }^{-}$ and observation of ${\chi }_{cJ}\to K\bar{K}\pi \pi \pi$
• Branching fraction measurements of χ_{c0} and χ_{c2} to π^0π^0 and ηη
• Determination of the number of $J/\psi$ events with inclusive $J/\psi$ decays
• Partial Wave Analysis of ${\chi }_{c0}\to {\pi }^{+}{\pi }^{-}{K}^{+}{K}^{-}$
• Determination of the number of ${\psi }^{\prime }$ event at BESIII
• Evidence for psi' decays into gamma pi^0 and gamma eta
• Glueball-$Q\bar{Q}$ mixing and Okuba-Zweig-Iizuka rule violation in the hadronic decays of heavy quarkonia
• Observation of ${\chi }_{c1}$ decays into vector meson pairs $\varphi \varphi$, $\omega \omega$, and $\omega \varphi$
• A coherent study of ${\chi }_{c0,2}\to VV$, $PP$ and $SS$
• Evidence for f0(980)f0(980) production in chi_c0 decays
• χ_{c0,2} decay into light meson pairs and its implication of the scalar meson structures
• Higher-order multipole amplitude measurement in $\psi (2S)\to \gamma {\chi }_{c2}$

Cited by in corpus (1)

• Study the decays of ${\chi }_{cJ}(J=0,1,2)$ to light meson pairs with SU(3) flavor symmetry/breaking analysis