This title appears in the Scientific Report :
2013
Please use the identifier:
http://hdl.handle.net/2128/5543 in citations.
Please use the identifier: http://dx.doi.org/10.1103/PhysRevD.87.052005 in citations.
Evidence for ηc(2S) in ψ(3686)→γKS0K±π∓π+π-
Evidence for ηc(2S) in ψ(3686)→γKS0K±π∓π+π-
We search for the M1 radiative transition \psi(3686) \to \gamma\eta_{c}(2S) by reconstructing the exclusive \eta_{c}(2S) \to K_{S}^{0}K^{\pm}\pi^{\mp}\pi^{+}\pi^{-} decay using 1.06 \times 10^8 \psi(3686) events collected with the BESIII detector. The signal is observed with a statistical significan...
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Please use the identifier: http://dx.doi.org/10.1103/PhysRevD.87.052005 in citations.
We search for the M1 radiative transition \psi(3686) \to \gamma\eta_{c}(2S) by reconstructing the exclusive \eta_{c}(2S) \to K_{S}^{0}K^{\pm}\pi^{\mp}\pi^{+}\pi^{-} decay using 1.06 \times 10^8 \psi(3686) events collected with the BESIII detector. The signal is observed with a statistical significance of greater than 4 standard deviations. The measured mass of the \eta_{c}(2S) is 3646.9 \pm 1.6(stat) \pm 3.6(syst) MeV/c^2, and the width is 9.9 \pm 4.8(stat) \pm 2.9(syst) MeV/c^2. The product branching fraction is measured to be B(\psi(3686) \to \gamma\eta_{c}(2S)) \times B(\eta_{c}(2S) \to K_{S}^{0}K^{\pm}\pi^{\mp}\pi^{+}\pi^{-}) = (7.03 \pm 2.10(stat) \pm 0.70(syst)) \times 10^{-6}. This measurement complements a previous BESIII measurement of \psi(3686) \to \gamma\eta_{c}(2S) with \eta_{c}(2S) \to K_{S}^{0} K^{\pm}\pi^{\mp} and K^{+}K^{-}\pi^{0}. We search for the M1 radiative transition ψ(3686)→γηc(2S) by reconstructing the exclusive ηc(2S)→KS0K±π∓π+π- decay using 1.06×108 ψ(3686) events collected with the BESIII detector. The signal is observed with a statistical significance of greater than 4 standard deviations. The measured mass of the ηc(2S) is 3646.9±1.6(stat)±3.6(syst) MeV/c2, and the width is 9.9±4.8(stat)±2.9(syst) MeV/c2. The product branching fraction is measured to be B(ψ(3686)→γηc(2S))×B(ηc(2S)→KS0K±π∓π+π-)=(7.03±2.10(stat)±0.70(syst))×10-6. This measurement complements a previous BESIII measurement of ψ(3686)→γηc(2S) with ηc(2S)→KS0K±π∓ and K+K-π0. |