Observation of the Dalitz decay η' → γe+e- /M. Ablikim, M. N. Achasov, X. C. Ai [et.al.]

Электронный ресурс
Другой Автор
Ablikim, M.
Ai, X. C.
Chelkov, G. A.
Achasov, M. N.
Источник
Physical Review D 2015 Vol. 92, № 1. P. 012001-1-012001-11
Аннотация
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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$a We report the first observation of the Dalitz decay η′→γe+e−, based on a data sample of 1.31 billion J/ψ events collected with the BESIII detector. The η′ mesons are produced via the J/ψ→γη′ decay process. The ratio Γ(η′→γe+e−)/Γ(η′→γγ) is measured to be (2.13±0.09(stat)±0.07(sys))×10−2. This corresponds to a branching fraction B(η′→γe+e−)=(4.69±0.20(stat)±0.23(sys))×10−4. The transition form factor is extracted and different expressions are compared to the measured dependence on the e+e− invariant mass. The results are consistent with the prediction of the vector meson dominance model.
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$a Chelkov, G. A.
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$a Achasov, M. N.
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$a Томский государственный университет $b Радиофизический факультет $b Научные подразделения РФФ
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статьи в журналах
Резюме
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.