Can B̄→Xcℓν̄ℓ help us extract |Vub|?

We study radiative corrections to →Xcll decays assuming the power counting mc ~ (ΛQCDmb)1/2 for the charm-quark mass. Concentrating on the shape-function region, we use effective field-theory methods to calculate the hadronic tensor at NLO accuracy. From this we deduce a shape-function independent relation between partially integrated →Xcll and →Xull spectra to leading power in 1/mb, including first-order corrections in the strong coupling constant. This may provide an independent cross-check on the determination of the CKM element |Vub|.