K π vector form factor, dispersive constraints and τ→ν τ K π decays
نویسندگان
چکیده
منابع مشابه
Kπ vector form factor , dispersive constraints and τ → ντKπ decays
Recent experimental data for the differential decay distribution of the decay τ− → ντKSπ− by the Belle collaboration are described by a theoretical model which is composed of the contributing vector and scalar form factors F + (s) and F 0 (s). Both form factors are constructed such that they fulfil constraints posed by analyticity and unitarity. A good description of the experimental measuremen...
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Dispersive representations of the Kπ vector and scalar form factors are used to fit the spectrum of τ → Kπν τ obtained by the Belle collaboration incorporating constraints from results for K l 3 decays. The slope and curvature of the vector form factor are obtained directly from the data through the use of a three-times-subtracted dispersion relation. We find λ ′ + = (25.49 ± 0.31) × 10 −3 and ...
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ژورنال
عنوان ژورنال: The European Physical Journal C
سال: 2008
ISSN: 1434-6044,1434-6052
DOI: 10.1140/epjc/s10052-008-0834-9