Extraction of the Structure Functions in τ→3πv Decay Using Li Model

The structure functions in the τ→3πv decay are extracted using the model proposed by Li. The predictions of Li model are compared with KS ones and the data from OPAL experiment. It is found that predictions by the model for ω_A (Q²) are consistent with the data except for in the high energy region (Q² > 1.2 GeV² ) , and ω_C, ω_D, ω_E normalized to ω_A are in reasonable agreement with the experimental results. Correction factors to the Breit-Wigner distribution of a₁ and the Lagrangian of this decay are proposed to the model.