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Amplitude analysis of the decays η′→π+π−π0 and η′→π0π0π0 M. Ablikim, M. N. Achasov, X. C. Ai [et al.]

Contributor(s): Achasov, M. N | Ai, X. C | Chelkov, G. A | Ablikim, MMaterial type: ArticleArticleSubject(s): BESIII, детектор | BEPCII, коллайдерGenre/Form: статьи в журналах Online resources: Click here to access online In: Physical Review Letters Vol. 118, № 1. P. 012001-012001-8Abstract: Based on a sample of 1.31×109  J/ψ events collected with the BESIII detector, an amplitude analysis of the isospin-violating decays η′→π+π−π0 and η′→π0π0π0 is performed. A significant P-wave contribution from η′→ρ±π∓ is observed for the first time in η′→π+π−π0. The branching fraction is determined to be B(η′→ρ±π∓)=(7.44±0.60±1.26±1.84)×10−4, where the first uncertainty is statistical, the second systematic, and the third model dependent. In addition to the nonresonant S-wave component, there is a significant σ meson component. The branching fractions of the combined S-wave components are determined to be B(η′→π+π−π0)S=(37.63±0.77±2.22±4.48)×10−4 and B(η′→π0π0π0)=(35.22±0.82±2.54)×10−4, respectively. The latter one is consistent with previous BESIII measurements.
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Based on a sample of 1.31×109  J/ψ events collected with the BESIII detector, an amplitude analysis of the isospin-violating decays η′→π+π−π0 and η′→π0π0π0 is performed. A significant P-wave contribution from η′→ρ±π∓ is observed for the first time in η′→π+π−π0. The branching fraction is determined to be B(η′→ρ±π∓)=(7.44±0.60±1.26±1.84)×10−4, where the first uncertainty is statistical, the second systematic, and the third model dependent. In addition to the nonresonant S-wave component, there is a significant σ meson component. The branching fractions of the combined S-wave components are determined to be B(η′→π+π−π0)S=(37.63±0.77±2.22±4.48)×10−4 and B(η′→π0π0π0)=(35.22±0.82±2.54)×10−4, respectively. The latter one is consistent with previous BESIII measurements.

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