Non - 1 / m nb Power Suppressed Contributions to Inclusive B → X s l + l − Decays

We compute non-perturbative contributions to B → Xs l+l− that are not explicitly suppressed by powers of the b-quark mass. They are proportional to 〈B|hσ·Gh|B〉 and arise from an interference between the free-quark amplitude and higher order terms in the matrix element of the four-quark operator sγ(1 − γ5)cα cγμ(1 − γ5)bβ . This correction is found to be small over most of the dalitz plot except near the charm threshold. Unfortunately, the perturbative computation we have performed is invalid near charm threshold and we do not except to see the structure found at lowest order reproduced in the data. We conclude that these non-perturbative contributions do not significantly modify the previous analysis of B → Xs l+l−.