A simultaneous fit to five BESIII pi pi spectra yields M=990.0 MeV and Gamma=11.4 MeV for f0(980) in isospin-breaking decays, with couplings that favor KK molecule and q qbar models over tetraquark and hybrid models.
The φ(1020) → π 0π 0γ decay,
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The width of $f_{0}(980)$ in isospin-symmetry-breaking decays
A simultaneous fit to five BESIII pi pi spectra yields M=990.0 MeV and Gamma=11.4 MeV for f0(980) in isospin-breaking decays, with couplings that favor KK molecule and q qbar models over tetraquark and hybrid models.