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Observation of the doubly radiative decay η' → γγπ0 M. Ablikim, M. N. Achasov, S. Ahmed [et.al.]

Contributor(s): Ablikim, M | Ahmed, S | Chelkov, G. A | Achasov, M. NMaterial type: ArticleArticleSubject(s): BESIII, детектор | мезоныGenre/Form: статьи в журналахOnline resources: Click here to access online In: Physical Review D Vol. 96, № 1. P. 012005-1-012005-8Abstract: Based on a sample of 1.31 billion J/ψ events collected with the BESIII detector, we report the study of the doubly radiative decay η′→γγπ0 for the first time, where the η′ meson is produced via the J/ψ→γη′ decay. The branching fraction of η′→γγπ0 inclusive decay is measured to be B(η′→γγπ0)Incl=(3.20±0.07(stat)±0.23(sys))×10−3, while the branching fractions of the dominant process η′→γω and the nonresonant component are determined to be B(η′→γω)×B(ω→γπ0)=(23.7±1.4(stat)±1.8(sys))×10−4 and B(η′→γγπ0)NR=(6.16±0.64(stat)±0.67(sys))×10−4, respectively. In addition, the Mγγ2-dependent partial widths of the inclusive decay are also presented.
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Based on a sample of 1.31 billion J/ψ events collected with the BESIII detector, we report the study of the doubly radiative decay η′→γγπ0 for the first time, where the η′ meson is produced via the J/ψ→γη′ decay. The branching fraction of η′→γγπ0 inclusive decay is measured to be B(η′→γγπ0)Incl=(3.20±0.07(stat)±0.23(sys))×10−3, while the branching fractions of the dominant process η′→γω and the nonresonant component are determined to be B(η′→γω)×B(ω→γπ0)=(23.7±1.4(stat)±1.8(sys))×10−4 and B(η′→γγπ0)NR=(6.16±0.64(stat)±0.67(sys))×10−4, respectively. In addition, the Mγγ2-dependent partial widths of the inclusive decay are also presented.

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