Updating V_us from kaon semileptonic decays

Details Updating V_us from kaon semileptonic decays Updating V_us from kaon semileptonic decays

2001-11-22

arxiv.org/abs/hep-ph/0111272v1

Phys.Rev.D65:073032,2002

Physics

High Energy Physics

High Energy Physics - Phenomenology

19 pages, 2 figures

Scientific paper

10.1103/PhysRevD.65.073032

We update the determination of |V_us| using semielectronic and semimuonic decays of K mesons. A modest improvement of 15% with respect to its present value is obtained for the error bar of this matrix element when we combine the four available semileptonic decays. The combined effects of long-distance radiative corrections and nonlinear terms in the vector form factors can decrease the value of |V_us| by up to 1%. Refined measurements of the decay widths and slope form factors in the semimuonic modes and a more accurate calculation of vector form factors at zero momentum transfer can push the determination of |V_us| at a few of percent level.

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