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We study the isospin breaking in the reactions χc1→π0π+π− and χc1→π0π0η and its relation to the a0(980)−f0(980) mixing, which was measured by the BESIII Collaboration. We show that the same theoretical model previously developed to study the χc1→ηπ+π− reaction (also measured by BESIII), and further explored in the predictions to the ηc→ηπ+π−, can be successfully employed in the present study. We assume...
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