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

References in corpus (3)

• Enhanced Non-local Power Corrections to the B->X_s+gamma Decay Rate
• Extracting short distance information from b -> s l+ l- effectively
• Extraction of |Vub| with Reduced Dependence on Shape Functions

Cited by in corpus (3)

• Treating the b quark distribution function with reliable uncertainties
• Nonperturbative m_X cut effects in B -> Xs l+ l- observables
• On the determination of |V_{ub}| from inclusive semileptonic B decays