Long-distance contributions to the K_L --> mu+ mu- decay width

Preprint

14 January 1998

preprint
Published by arXiv in arXiv

Abstract

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 byproduct, one predicts Br(Eta --> e+ e-) = (4.4 +- 0.2) x 10^-9 and Br(K_L --> e+ e-) = (8.5+-0.4) x 10^-12.

Keywords

DISTANCE CONTRIBUTIONS
PERTURBATION THEORY
DISPERSIVE TWO
MU DECAY
CHIRAL
PHOTON
ETA
K_L

All Related Versions

Version 1, 1998-01-14, ArXiv
Version 2, 1998-04-21, ArXiv
Published version: Physical Review Letters, 80 (21), 4633.

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