Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2000-02-15
Phys.Lett.B479:395-401,2000
Physics
High Energy Physics
High Energy Physics - Phenomenology
11 pages; some references added, version to appear in PLB
Scientific paper
10.1016/S0370-2693(00)00318-X
It is shown that measuring the lepton invariant mass spectrum in inclusive semileptonic B -> X_u l nu decay yields a model independent determination of |V_{ub}|. Unlike the lepton energy and hadronic invariant mass spectra, nonperturbative effects are only important in the resonance region, and play a parametrically suppressed role when d\Gamma/dq^2 is integrated over q^2 > (m_B-m_D)^2, which is required to eliminate the charm background. Perturbative and nonperturbative corrections are presented to order \alpha_s^2\beta_0 and \Lambda_{QCD}^2/m_b^2, and the \Lambda_{QCD}^3/m_b^3 corrections are used to estimate the uncertainty in our results. The utility of the B -> X_s l^+ l^- decay rate above the \psi(2S) resonance is discussed.
Bauer Christian W.
Ligeti Zoltan
Luke Michael
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