Experimental data on the three-pion decay of the tau lepton are used to determine the mixing angle in a two-component a(1)rho pi Lagrangian.The result is compatible with the recent analysis based on the electron-positron annihilation into four pions.
Experimental data on the three-pion decay of the tau lepton are used to determine the mixing angle in a two-component a(1)rho pi Lagrangian.The result is compatible with the recent analysis based on the electron-positron annihilation into four pions. (en)