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- W4387148216 abstract "Based on a data sample of $(27.08 pm 0.14 ) times 10^8~psi(3686)$ events collected with the BESIII detector at the BEPCII collider, the M1 transition $psi(3686) to gamma eta_{c}(2S)$ with $eta_{c}(2S) to Kbar{K}pi$ is studied, where $Kbar{K}pi$ is $K^{+} K^{-} pi^{0}$ or $K_{S}^{0}K^{pm}pi^{mp}$. The mass and width of the $eta_{c}(2S)$ are measured to be $(3637.8 pm 0.8 (rm {stat}) pm 0.2 (rm {syst}))$ MeV/$c^{2}$ and $(10.5 pm 1.7 (rm {stat}) pm 3.5 (rm {syst}))$ MeV, respectively. The product branching fraction $mathcal{B}left(psi(3686) rightarrow gamma eta_{c}(2 S)right) times mathcal{B}(eta_{c}(2 S) rightarrow K bar{K} pi)$ is determined to be $(0.97 pm 0.06 (rm {stat}) pm 0.09 (rm {syst})) times 10^{-5}$. Using $mathcal{BR}(eta_{c}(2S)to Kbar{K}pi)=(1.86^{+0.68}_{-0.49})%$, we obtain the branching fraction of the radiative transition to be $mathcal{BR}(psi(3686) to gamma eta_{c}(2S)) = (5.2 pm 0.3 (rm {stat}) pm 0.5 (rm {syst}) ^{+1.9}_{-1.4} (extr)) times 10^{-4}$, where the third uncertainty is due to the quoted $mathcal{BR}(eta_{c}(2S) to Kbar{K}pi)$." @default.
- W4387148216 created "2023-09-29" @default.
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