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 $B({\chi }_{c2}\to {\pi }^0{\eta }_c)<3.2\times 10^{-3}$.

arXiv comment9 pages, 3 figures

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• Studies of Charmonium at BESIII