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.

Amplitude Analysis of the Decays eta ' -> pi(+)pi(-)pi(0) and eta' -> pi(0)pi(0)pi(0)

FARINELLI, Riccardo;GARZIA, Isabella;
2017

Abstract

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.
2017
Ablikim, M.; Achasov, M. N.; Ai, X. C.; Albayrak, O.; Albrecht, M.; Ambrose, D. J.; Amoroso, A.; An, F. F.; An, Q.; Bai, J. Z.; Baldini Ferroli, R.; B...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11392/2369492
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