Two-loop QCD corrections to semileptonic b decays at maximal recoil

We present a complete Omicron(alpha(s)(2)) correction to the differential width of the inclusive semileptonic decay b-->clv(l) at the kinematical point of vanishing invariant mass of the leptons, q(2)=0. Together with the recently computed Omicron(alpha(s)(2)) correction at the upper boundary of the lepton invariant mass spectrum, this new information permits an estimate of the Omicron(alpha(s)(2)) effect in the total inclusive semileptonic decay width b-->clv(l). We argue that the non-Brodsky-lepage-Mackenzie (BLM) part of the Omicron(alpha(s)(2)) correction gives at most 1% correction to the inclusive semileptonic decay width b-->clv(l). This significantly improves the credibility of extracting /V-cb/ from the inclusive semileptonic decays of the b hadrons.