We consider the possibility of having a large branching ratio for the decay
b→sg coming from an enhanced Wilson coefficient of the chromomagnetic
dipole operator. We show that values of BR(b→sg) up to ∼10% or
more are compatible with the constraints coming from the CLEO experimental
results on BR(B→Xsγ) and BR(B→Xsϕ). Such large values can
reconcile the predictions of both the semileptonic branching ratio and the
charm counting with the present experimental results. We also discuss a
supersymmetric model with gluino-mediated flavour violations, which can account
for such large values of BR(b→sg).Comment: 19 pages, 3 eps figures included, replacement with minor change