The decay $\tau \to f_1\pi {\nu }_{\tau }$ in the Nambu--Jona-Lasinio model

Abstract

The width of the decay $\tau \to f_1\pi {\nu }_{\tau }$ has recently been measured by the BaBar experiment. The estimation of this width is given in the framework of the NJL model with the axial-vector mesons. Prediction is in agreement with the experimental data. It is shown that the $\pi -a_1$ transition contribution plays an important role and allows us to bring the NJL prediction to the data.

Comments: 3 pages, 3 figures