Study of $a_0^0(980) - f_0(980)$ mixing

Using samples of 2.25*10^8 J/psi events and 1.06*10^8 psi' events collected with the BES III detector, we study the f0(980) to a0(980) and a0(980) to f0(980) transitions in the processes J/psi --> phi f0(980) --> phi a0(980) and chi_c1 --> pi^0 a0(980) --> pi^0 f0(980), respectively. Evidence for f0(980) --> a0(980) is found with a significance of 3.4 sigma, while in the case of a0(980) --> f0(980) transition, the significance is 1.9 sigma. Measurements and upper limits of both branching ratios and mixing intensities are determined.

Note:

19 pages, 4 figures, published in Phys. Rev. D

25.75.Gz
14.40.Df
branching ratio: upper limit
J/psi(3100): hadronic decay
mixing: (a0(980) f0(980))
BES
electron positron: annihilation
psi mesons: electroproduction
J/psi(3100): branching ratio: measured
psi(3685): branching ratio: measured

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Study of $a_0^0(980) - f_0(980)$ mixing