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We investigate sum rules for heavy-to-light transition form factors at largerecoil derived from correlation functions with interpolating currents for lightpseudoscalar or vector fields in soft-collinear effective theory (SCET). Weconsider both, factorizable and non-factorizable contributions at leading powerin the Lambda/m_b expansion and to first order in the strong coupling constantalpha_s, neglecting contributions from 3-particle distribution amplitudes inthe B-meson. We pay particular attention to various sources of parametric andsystematic uncertainties. We also discuss certain form factor ratios where partof the hadronic uncertainties related to the B-meson distribution amplitude andto logarithmically enhanced alpha_s corrections cancel.

SCET sum rules for B->P and B->V transition form factors