The and couplings in QCD
Institute of Theoretical Physics, Academia Sinica, P.O.BOX 2735, Beijing 100080, P.R.China
Received: 31 July 1998 / Revised version: 20 November 1998 Communicated by W. Weise
The light cone QCD sum rules are derived for the coupling and the coupling . The contribution from the excited states and the continuum is subtracted cleanly through the double Borel transform with respect to the two external momenta, p12, p22=(p-q)2. Our result and is in good agreement with the experimental value.
13.75.Lb Meson-meson interactions - 14.40.-n Mesons - 13.25.-k Hadronic decays of mesons - 12.38.Lg Nonperturbative methods