Abstract
Using a large sample of pure, slow, short lived neutral kaon mesons collected with KLOE at DAFNE, we have measured the K S lifetime. From a fit to the proper time distribution we find τ S = 89.562 ± 0.052 ps, in good agreement with recent measurements. While measuring the ratio R K = Γ ( K e 2 ( γ ) ± ) / Γ ( K μ 2 ( γ ) ± ) , the KLOE Collaboration has studied the radiative process K e 2 γ . The observed radiation spectrum agrees with predictions from chiral perturbation theory. This result reduces the contribution to systematic uncertainties on measurements of R K .
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