1997/09/19 by Patricia Ball, Ball, Patricia
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #hep-ph
paper · pdf · doi:10.48550/arxiv.hep-ph/9709407
10 pages, LaTeX, 4 figures. Invited plenary talk given at the 7th International Symposium on Heavy Flavor Physics, Santa Barbara, California, 7-11 July 1997. To appear in the proceedings
arxiv created 1997/09/19 · arxiv updated 2009/11/30
I review currently discussed methods to determine the CKM mixing matrix element |Vub| from experimental data. Although the theory of inclusive decays and their spectra has entered a model-independent stage, its predictions are still sensitive to various input parameters, in particular the poorly known b quark mass. At present, determinations from exclusive channels, notably B→πe ν, seem slightly more accurate and allow determination of |Vub| from the spectrum in the momentum transfer to the leptons with a theoretical uncertainty of ∼ 10%.