Using methods developed for hard exclusive QCD processes, we calculate
the asymptotic behavior of heavy-meson form factors at large recoil.
It is determined by the leading- and subleading-twist meson wave funct
ions. For 1 much less than\v . v'\much less than m(Q)/Lambda, the form
factors are dominated by the Isgur-Wise function, which is determined
by the interference between the wave functions of leading and sublead
ing twist. At \v . v'\much greater than m(Q)/Lambda, they are dominate
d by two functions arising at order 1/m(Q) in the heavy-quark expansio
n, which are determined by the leading-twist wave function alone. The
sum of these contributions describes the form factors in the whole reg
ion \v . v'\ much greater than 1. As a consequence, there is an exact
zero in the form factor for the scattering of longitudinally polarized
B mesons at some value v . v' similar to m(b)/Lambda, and an approxi
mate zero in the form factor of B mesons in the timelike region (v . v
' similar to -m(b)/Lambda). We obtain the evolution equations and sum
rules for the wave functions of leading and subleading twist as well a
s for their moments. We briefly discuss applications to heavy-meson pa
ir production in e(+)e(-) collisions.