Using a sample of 1.31x10^9 Jpsi events collected with the BESIII detector at the BEPCII collider, the decays Jpsi--> phi pi+pi-pi0 and Jpsi--> phi pi0pi0pi0 are investigated. The isospin-violating decay Jpsi--> phi pi0 f0(980) with f0(980)-->pipi is observed for the first time. The width of the f0(980) obtained from the dipion mass spectrum is found to be much smaller than the world average value. In the pi0f0(980) mass spectrum, there is evidence of f1(1285) production. By studying the decay Jpsi --> phi eta', the branching fractions of eta' --> pi+pi-pi0 and eta'--> pi0pi0pi0, as well as their ratio, are also measured.
Observation of the isospin-violating decay Jpsi-->phi pi0 f0(980)
Garzia, I.;
2015
Abstract
Using a sample of 1.31x10^9 Jpsi events collected with the BESIII detector at the BEPCII collider, the decays Jpsi--> phi pi+pi-pi0 and Jpsi--> phi pi0pi0pi0 are investigated. The isospin-violating decay Jpsi--> phi pi0 f0(980) with f0(980)-->pipi is observed for the first time. The width of the f0(980) obtained from the dipion mass spectrum is found to be much smaller than the world average value. In the pi0f0(980) mass spectrum, there is evidence of f1(1285) production. By studying the decay Jpsi --> phi eta', the branching fractions of eta' --> pi+pi-pi0 and eta'--> pi0pi0pi0, as well as their ratio, are also measured.File in questo prodotto:
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