Journal
PHYSICAL REVIEW D
Volume 74, Issue 9, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.74.096006
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Rigorous bounds are established for the expansion coefficients governing the shape of semileptonic K ->pi form factors. The constraints enforced by experimental data from tau -> K pi nu eliminate uncertainties associated with model parametrizations in the determination of vertical bar V-us vertical bar. The results support the validity of a powerful expansion that can be applied to other semileptonic transitions.
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