Abstract
Motivated by some new experimental and theoretical efforts, we update the theoretical analysis of the electron–positron energy asymmetry, which arises, in KL→π0e+e−, from the two-photon intermediate state in the Standard Model. It is found that the measurement of this asymmetry in future experiments may increase our understanding of the KL,S→π0e+e− decays, which would thus provide some useful information on quark flavor physics. Meanwhile, in the Standard Model the electron–positron energy asymmetry in the decay of KS→π0e+e− is expected to be vanishingly small, therefore the asymmetry in KS→π0e+e− might be a very interesting quantity to explore new physics scenarios.
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