D*Dπ form factor revisited
F. S. Navarra, M. Nielsen, M. E. Bracco
Abstract
The D*Dπ form factor is evaluated in a QCD sum rule calculation for both D and π off-shell mesons. We study the Borel sum rule for the three-point function of one pseudoscalar, one axial and one vector meson currents. We find that the momentum dependence of the form factors is very different if the D or the π meson is off-shell, but they lead to the same coupling constant in the D*Dπ vertex.
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