On the electron-positron energy asymmetry in K_L --> pi0 e+ e-

Abstract

Motivated by some new experimental and theoretical efforts, we update the theoretical analysis of the electron-positron energy asymmetry, which arises, in K_L --> pi0 e+ 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 K_{L, S} --> pi0 e+ 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 K_S --> pi0 e+ e- is expected to be vanishingly small, therefore the asymmetry in K_S --> pi0 e+ e- might be a very interesting quantity to explore new physics scenarios.

11 pages, 4 figures. Two figures added to show the sensitivity of the asymmetry to a_S and a_V, and some discussions added. To appear in Phys. Lett. B

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Cited by in corpus (1)

• KL to pi0 e+ e- and KL to pi0 mu+ mu- : A binary star on the stage of flavor physics