D*D pi and B*B pi form factors from QCD sum rules

The H*H pi form factor for H = B and D mesons is evaluated in a QCD sum rul e calculation. We study the Borel sum rule for the three point function of two pseudoscalar and one vector meson currents up to order four in the oper ator product expansion. The double Borel transform is performed with respec t to the heavy meson momenta. We discuss the momentum dependence of the for m factors and two different approaches to extract the H*H pi coupling const ant.