2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/184040Contributions to B\to πl νdecay from 1/m_Q order corrections are analyzed in the heavy quark effective field theory (HQEFT) of QCD. Transition wave functions of 1/m_Q order are calculated through light cone sum rule (LCSR) within the HQEFT framework. The results are compared with those from other approaches.12 pages, revtex, 5 figuresHigh Energy Physics - Phenomenologytext