Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2010-04-09
Phys.Part.Nucl.Lett.8:13-18,2011
Physics
High Energy Physics
High Energy Physics - Phenomenology
11 pages, 7 figures. To appear in Particles and Nuclei, Letters
Scientific paper
10.1134/S1547477111010092
In framework of the chiral perturbation theory we obtain the phenomenological relations between decay branches of rare radiative kaon to pion and leptons $K^+ \to \pi^+ l^+ l^-$ and $K^0_S \to \pi^0 l^+ l^-$ and meson form factors. The comparison of these results with the present day experimental data shows us that the ChPT relations for a charge kaon can determine meson form factors from already measured decay rates at high precision level. However, in the case of the neutral kaon decays $K^0 \to \pi^0 e^+ e^- (\mu^+ \mu^-)$ the formfactor data are known to a high precision than data on the differential rates of radiative kaon decay $K^0 \to \pi^0 e^+ e^- (\mu^+ \mu^-)$.
Pervushin Victor
Shilin V.
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