Abstract
We analyze the hadronic invariant mass spectrum in inclusive charmless semileptonic $B$ meson decays in a QCD-based approach. The decay width is studied as a function of the invariant mass cut. We examine their sensitivities to the parameters of the theory. The theoretical uncertainties in the determination of $|{V}_{\mathrm{ub}}|$ from the hadronic invariant mass spectrum are investigated. A strategy for improving the theoretical accuracy in the value of $|{V}_{\mathrm{ub}}|$ is described.
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