Studying the scale and q2 dependence of K+-->pi+e+e- decay
Abstract
We extract the K+-->pi+e+e- amplitude scale at q2=0 from the recent Brookhaven E865 high-statistics data. We find that the q2=0 scale is fitted in excellent agreement with the theoretical long-distance amplitude. Lastly, we find that the observed q2 shape is explained by the combined effect of the pion and kaon form-factor vector-meson-dominance rho, omega and phi poles, and a charged pion loop coupled to a virtual photon-->e+e- transition.
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