The most promising ways to measure $V_{ub}$
arXiv: High Energy Physics - Phenomenology(1997)
Abstract
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 $\sim 10%$.
MoreTranslated text
Key words
momentum transfer,spectrum,particle physics phenomenology,high energy physics
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