2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/167858We present the results of our recent systematic study of the light-cone expansion of heavy-to-light transition form factors in a model with scalar constituents [1]. We show that the higher-twist contributions (represented in this model by off-light-cone effects) all have the same behaviour in the 1/m_Q expansion. The suppression parameter of the higher-twist contributions compared to the lower-twist contributions is, in general, the inverse Borel parameter β. The only exception here is the case of the leading and the subleading twists: they are of the same order in 1/βbecause of an extra suppression of the leading-twist contribution to the form factor.3 pages, Talk given at XIII International Conference "Selected Problems of Modern Theoretical Physics", Dubna, Russia, June 23-27, 2008High Energy Physics - Phenomenologytext