The most promising ways to measure V_ub

Details The most promising ways to measure V_ub The most promising ways to measure V_ub

1997-09-19

arxiv.org/abs/hep-ph/9709407v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

10 pages, LaTeX, 4 figures. Invited plenary talk given at the 7th International Symposium on Heavy Flavor Physics, Santa Barba

Scientific paper

I review currently discussed methods to determine the CKM mixing matrix element $|V_{ub}|$ 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 $B\to\pi e \nu$, seem slightly more accurate and allow determination of $|V_{ub}|$ from the spectrum in the momentum transfer to the leptons with a theoretical uncertainty of $\sim 10%$.

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