HIGHER-ORDER 1 M CORRECTIONS AT ZERO RECOIL

The general structure of the 1/m corrections at zero recoil is studied . The relevant matrix elements are forward matrix elements of local hi gher dimensional operators and their time ordered products with higher order terms from the Lagrangian. These matrix elements may be classif ied in a simple way and the analysis at the nonrecoil point for the fo rm factor of heavy quark currents simplifies drastically. The second-o rder recoil corrections to the form factor hA1 of the axial vector cur rent, relevant for the \V)cb)\ determination from B --> D decays, are estimated to be -5% < h(A1) -1 < 0.