New approach for calculating heavy-to-light form factors with QCD sum   rules on the light-cone
  We suggest a new approach for calculating heavy-to-light form factors. The method is based on light cone sum rules (LCSR) and covers the whole kinematical range of momentum transfer. The derivation of the new sum rule uses a suitable combination of double and single dispersion integrals. As an example we give numerical results for the form factor f^+ for the B -> pion transition. 
Stefan Weinzierl, Oleg Yakovlev