M. A. is supported by Generalitat Valenciana under Grant No. CIDEGENT/2020/002, and by the Spanish Ministerio de Ciencia e Innovación (MICINN) under Contracts No. PID2020–112777 GBI00. The work of S. G. S. is supported by the Laboratory Directed Research and Development program of Los Alamos National Laboratory under Project No. 20210944PRD2, and by the U.S.Department of Energy through the LosAlamosNational Laboratory. Los Alamos National Laboratory is operated by Triad National Security, LLC, for the National Nuclear Security Administration of U.S. Department of Energy (Contract No. 89233218CNA000001). This work was supported by the U.S. Department of Energy Contract No. DE-AC05-06OR23177, under which Jefferson Science Associates, LLC operates Jefferson Lab, U.S. Department of Energy Grants No. DE-FG02-87ER40365 and No. DE-FG02-92ER40735, CONACYT (Mexico) Grant No. A1-S-21389, and Spanish national Grants No. PID2020–118758 GB-I00 and No. PID2019– 106080 GB-C21. C. F. R. is supported by Spanish Ministerio de Educación y Formación Profesional under Grant No. BG20/00133. N. H. is supported by the Polish research projectNo. 2018/29/B/ST2/02576 fromtheNational Science Center. V. M. is a Serra Húnter fellow. The work of M. M. is funded by the Deutsche Forschungsgemeinschaft under Germany’s Excellence Strategy-EXC-2094- 390783311. D.W. is supported by National Natural Science Foundation of China Grant No. 12035007 and the NSFC and the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) through the funds provided to the Sino-German Collaborative Research Center TRR110 “Symmetries and the Emergence of Structure in QCD” (NSFC Grant No. 12070131001, DFG ProjectID 196253076-TRR 110). This work contributes to the aims of the U.S. Department of Energy ExoHad Topical Collaboration, contract No. DE-SC0023598.

We study the decay J/ψ→π+π-π0 within the framework of the Khuri-Treiman equations. We find that the BESIII experimental dipion mass distribution in the ρ(770)-region is well reproduced with a once-subtracted P-wave amplitude. Furthermore, we show that F-wave contributions to the amplitude improve the description of the data in the ππ mass region around 1.5 GeV. We also present predictions for the J/ψ→π0γ∗ transition form factor.

Peer reviewed