On the determination of |V_{ub}| from inclusive semileptonic B decays

Understand

Precision tests of the CKM mechanism and searches for new physics in the flavour sector require dedicated QCD calculations of decay widths and spectra.

• Significant progress has been achieved in recent years in computing inclusive B decay spectra into light energetic partons.
• I briefly review different theoretical approaches to this problem focusing on the determination of |V_{ub}| from inclusive semileptonic decays and show that this determination is robust.
• The largest uncertainty is associated with the value of the b quark mass.