Semileptonic B decays and the inclusive determination of |V(ub)|

Details Semileptonic B decays and the inclusive determination of |V(ub)| Semileptonic B decays and the inclusive determination of |V(ub)|

2007-12-04

arxiv.org/abs/0712.0466v1

J.Phys.Conf.Ser.110:052017,2008

Physics

High Energy Physics

High Energy Physics - Phenomenology

Dec 2007. 4pp. To appear in the proceedings of the 2007 Europhysics Conference on High Energy Physics (EPS-HEP2007), Mancheste

Scientific paper

10.1088/1742-6596/110/5/052017

We present a new theoretical framework for the study of $B\to X_u \ell \nu$ decays, which includes all known perturbative and non-perturbative contributions 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 to the high $q^2$ region and to Weak Annihilation effects. We provide estimates of the CKM parameter $|V_{ub}|$ using the described framework and discuss the related theoretical uncertainty.

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