QCD Description of Hadronic Tau Decays
نویسنده
چکیده
The contributions coming from the first two terms correspond to Rτ,V and Rτ,A respectively, while Rτ,S contains the remaining Cabibbo-suppressed contributions. The integrand in Eq. (3) cannot be calculated at present from QCD. Nevertheless the integral itself can be calculated systematically by exploiting the analytic properties of the correlators Π(s). They are analytic functions of s except along the positive real s-axis, where their imaginary parts have discontinuities. Rτ can then be written as a contour integral in the complex s-plane running counter-clockwise around the circle |s| = mτ [6]:
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