We calculate the B→P, B→V (P: light pseudoscalar meson, V light
vector meson) form factors in the large-recoil limit in perturbative QCD
approach, including both the vector (axial vector) and tensor operators. In
general there are two leading components ϕB​ and ϕˉ​B​ for B
meson wave functions. We consider both contributions of them. Sudakov effects
(k⊥​ and threshold resummation) are included to regulate the soft
end-point singularity. By choosing the hard scale as the maximum virtualities
of internal particles in the hard b-quark decay amplitudes, Sudakov factors
can effectively suppress the long-distance soft contribution. Hard contribution
can be dominant in these approaches.Comment: 21 pages, with 2 figure