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Abstract:
The density matrix and helicity formalism of angular distribution of process e+e-→τ+τ-,τ-→a1υτ,a1→ρπ have been obtained. The helicity amplitude ratios corresponding to the form factors of the W-a1 transition and the strong interaction vertex a1ρπ are determined by the sectionalized fitting method. A model-independent method for determining the mass and width of the wide resonance a1 is given.
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