Amplitude Analysis of the Decaysη0→πþπ−π0andη0→π0π0π0
Özet
Based on a sample of1.31×109J=ψevents collected with the BESIII detector, an amplitude analysisof the isospin-violating decaysη0→πþπ−π0andη0→π0π0π0is performed. A significantP-wavecontribution fromη0→ρ π∓is observed for the first time inη0→πþπ−π0. The branching fraction isdetermined to beBðη0→ρ π∓Þ¼ð7.44 0.60 1.26 1.84Þ×10−4, where the first uncertainty isstatistical, the second systematic, and the third model dependent. In addition to the nonresonantS-wavecomponent, there is a significantσmeson component. The branching fractions of the combinedS-wavecomponents are determined to beBðη0→πþπ−π0ÞS¼ð37.63 0.77 2.22 4.48Þ×10−4andBðη0→π0π0π0Þ¼ð35.22 0.82 2.54Þ×10−4, respectively. The latter one is consistent with previousBESIII measurements.
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