Subleading power factorization in overline{B}to {X}_s{ell}^{+}{ell}^{-}

Abstract

We analyze the factorization to subleading power in the flavor changing neutral current process overline{B}to {X}_s{ell}^{+}{ell}^{-} . In particular, we compute the so-called resolved contributions and explore the numerical impact on observables. In these contributions the virtual photon couples to light partons instead of connecting directly to the effective weak-interaction vertex. They represent an irreducible uncertainty in the inclusive overline{B}to {X}_s{ell}^{+}{ell}^{-} decay which cannot be removed by relaxing the experimentally necessary cuts in the hadronic mass spectrum.