- Main
Observation of the Dalitz decay η′→γe+e-
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- Zhang, ZY;
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- Zhao, JZ;
- Zhao, Lei;
- Zhao, Ling;
- Zhao, MG;
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- Zhao, SJ;
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- Zhao, ZG;
- Zhemchugov, A;
- Zheng, B;
- Zheng, JP;
- Zheng, WJ;
- Zheng, YH;
- Zhong, B;
- Zhou, L;
- Zhou, Li;
- Zhou, X;
- Zhou, XK;
- Zhou, XR;
- Zhou, XY;
- Zhu, K;
- Zhu, KJ;
- Zhu, S;
- Zhu, XL;
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- Zhu, YS;
- Zhu, ZA;
- Zhuang, J;
- Zotti, L;
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- Zou, JH
- et al.
Abstract
We report the first observation of the Dalitz decay η’→γe+e−, based on a data sample of 1.31 billion J/ψ events collected with the BESIII detector. The η’ mesons are produced via the J/ψ→γη’ decay process. The ratio Γ(η’→γe+e−)/Γ(η’→γγ) is measured to be (2.13±0.09(stat)±0.07(sys))×10−2. This corresponds to a branching fraction B(η’→γe+e−)=(4.69±0.20(stat)±0.23(sys))×10−4. The transition form factor is extracted and different expressions are compared to the measured dependence on the e+e− invariant mass. The results are consistent with the prediction of the vector meson dominance model.
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