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Long-distance contributions to the K-L ->mu(+)mu(-) decay width

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Long-distance contributions to the K-L ->mu(+)mu(-) decay width

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Gómez Dumm, Daniel; Pich Zardoya, Antonio

This document is a artículoDate1998

The dispersive two-photon contribution to the K-L --> mu(+)mu(-) decay amplitude is analyzed, using chiral perturbation theory techniques and large-N-C considerations. A consistent description of the decays pi(0) --> e(+)e(-), eta --> mu(+)mu(-), and K-L --> mu(+)mu(-) is obtained. As a by-product, one predicts B(eta --> e(+)e(-)) = (5.8 +/- 0.2) X 10(-9) and B(K-L --> e(+)e(-)) = (9.0 +/- 0.4) X 10(-12).

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