Study of K^0 \to pi^- e^+ nu_e e^+ e^- in chiral perturbation theory

Abstract

K^0 \to pi^- e^+ nu_e e^+ e^- decay is studied up to the next-to-leading order O^4 in chiral perturbation theory. It is found that the O^4 terms appreciably modifiy the shape of the invariant mass distribution of the leptons and the energy spectrum of the neutrino.

17 pages, 7 figures, figures and formula are added

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