Subleading Shape-Function Effects and the Extraction of |V_ub|

Abstract

We derive a class of formulae relating moments of B -> Xu l nu to B -> Xs gamma in the shape function region, where m_X^2 ~ m_b Lambda_QCD. We also derive an analogous class of formulae involving the decay B -> Xs l+ l-. These results incorporate Lambda_QCD/m_b power corrections, but are independent of leading and subleading hadronic shape functions. Consequently, they enable one to determine |V_ub|/|V_tb V_ts*| to subleading order in a model-independent way.

23 pages

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Cited by in corpus (6)

• Treating the b quark distribution function with reliable uncertainties
• Factorization at Subleading Power and Irreducible Uncertainties in $\bar{B}\to X_s\gamma$ Decay
• New Physics at a Super Flavor Factory
• Nonperturbative m_X cut effects in B -> Xs l+ l- observables
• Comments on $\left|\frac{V_{ub}}{V_{cb}}\right|$ and $|V_{ub}|$ from Non-leptonic $B$ Decays within the Perturbative QCD Approach
• On the determination of |V_{ub}| from inclusive semileptonic B decays