Searches for isospin-violating transitions ${\chi }_{c0,2}\to {\pi }^0{\eta }_c$

Abstract

We present the first upper-limit measurement of the branching fractions of the isospin-violating transitions ${\chi }_{c0,2}\to {\pi }^0{\eta }_c$. The measurements are performed using $106\times 10^6$ $\psi (3686)$ events accumulated with the BESIII detector at the BEPCII $e^{+}{e}^{-}$ collider at a center-of-mass energy corresponding to the $\psi (3686)$ mass. We obtained upper limits on the branching fractions at a 90\% confidence level of $B({\chi }_{c0}\to {\pi }^0{\eta }_c)<1.6\times 10^{-3}$ and $B({\chi }_{c2}\to {\pi }^0{\eta }_c)<3.2\times 10^{-3}$.

9 pages, 3 figures

References in corpus (5)

• Isospin breaking, coupled-channel effects, and X(3872)
• Novel analysis of the decays psi' -> h_c pi^0 and eta_c'-> chi_{c0} pi^0
• Trigger efficiencies at BES III
• Evidence for η_{c}(2S) in ψ(3686) \to γK_{S}^{0}K^{\pm}π^{\mp}π^{+}π^{-}
• Hadronic Transition chi(c1)(1P) to eta(c) plus two pions at the Beijing Spectrometer BES and the Cornell CLEO-c