Hadronic Spectral Moments in Semileptonic B Decays With a Lepton Energy Cut

We compute the first two moments 〈(sH − mD 2)1,2〉 of the final hadronic invariant mass in the inclusive decay B → Xc l ν̄, in the presence of a cut E min l on the charged lepton energy. These moments may be measured directly by experiments at the Υ(4S) using the neutrino reconstruction technique, which requires such a cut. Measurement of these moments will place constraints on the nonperturbative parameters Λ̄ and λ1, which are relevant for extracting the quark masses mb and mc, as well as the CKM angle Vcb. We include terms of order αsβ0 and 1/m 3 b in the operator product expansion, and use the latter to estimate the theoretical uncertainty in the extraction of Λ̄ and λ1.