Exact heavy to light meson form factors in the combined heavy quark, large N(sub c) and chiral limits

摘要

We demonstrate that the form factors of local operators between a heavy meson state (like the B) and a light pseudoscalar state (like the pion) are given exactly by a single pole form in the combined heavy quark, large N(sub c) (number of colors) and chiral limits. We discuss the deviations from this exact result from finite heavy quark masses, non-zero light quark masses and finite N(sub c). We comment on some of the numerous implications of this result.