Abstract
We analyse the muon longitudinal polarization asymmetry Δ long in the decay K +→ π + μ + μ −. It is stressed that, since the muon helicities are not Lorentz-invariant quantities, the magnitude of Δ long depends in general on the reference frame. We consider the muon helicities in the LAB system, and study the sensitivity of the longitudinal polarization asymmetry to the flavour-mixing parameters in the Standard Model for stopped and in-flight decaying K +. A similar analysis is carried out for the decay K L → μ + μ −. We find that in both cases the asymmetry is diluted when increasing the energy of the decaying kaons.
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