2006/11/08 by Patricia Ball · 2 citations
Physics and Astronomy · #Black Holes and Theoretical Physics #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ex #hep-ph
paper · pdf · doi:10.1016/j.physletb.2006.11.034
published as Phys.Lett.B644:38-44,2007 · 13 pages, 3 figures
arxiv created 2006/11/08 · openalex publication_date 2006/11/29 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
The angles of the CKM unitarity triangle are now known well enough to allow a determination of its sides from global fits, with good accuracy. Assuming that new physics does not affect the angles, UTfit and CKMfitter find |Vub| = (3.50± 0.18)× 10-3. Using this result, and new high-precision data on the spectrum of B→πℓν decays from BaBar, we find |Vub| f+(0) = (9.1± 0.7)× 10-4 and f+(0) = 0.26± 0.02, with f+ the B→π weak transition form factor. These results are \em completely model-independent. We compare them to theoretical calculations from lattice and QCD sum rules on the light-cone.