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Abstract: We present a new theoretical framework for the study of $B\to X u \ell u$decays, which includes all known perturbative and non-perturbativecontributions and a description of leading and subleading Fermi motion effects.The perturbative and non-perturbative regimes are separated by a ``hard-Wilsonian cutoff $\mu \sim 1$ GeV. We bring into focus some problems related tothe high $q^2$ region and to Weak Annihilation effects. We provide estimates ofthe CKM parameter $|V {ub}|$ using the described framework and discuss therelated theoretical uncertainty.



Autor: P. Giordano

Fuente: https://arxiv.org/







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