  We demonstrate that in a wide range of temperatures Coulomb drag between two
weakly coupled quantum wires is dominated by processes with a small interwire
momentum transfer. Such processes, not accounted for in the conventional
Luttinger liquid theory, cause drag only because the electron dispersion
relation is not linear. The corresponding contribution to the drag resistance
scales with temperature as T^2 if the wires are identical, and as T^5 if the
wires are different.
