LAB observables for the muon polarization in K^+ --> π^+ μ^+ μ^-

Details LAB observables for the muon polarization in K^+ --> π^+ μ^+ μ^- LAB observables for the muon polarization in K^+ --> π^+ μ^+ μ^-

1999-07-23

arxiv.org/abs/hep-ph/9907479v1

Phys.Lett. B463 (1999) 309-316

Physics

High Energy Physics

High Energy Physics - Phenomenology

12 pages, 2 figures, REVTeX, to be published in Phys. Lett. B

Scientific paper

10.1016/S0370-2693(99)00997-1

We analyse the muon longitudinal polarization asymmetry \Delta_long in the decay K^+ --> \pi^+ \mu^+ mu^-. It is stressed that, since the muon helicities are not Lorentz-invariant quantities, the magnitude of \Delta_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 --> \mu^+ \mu^-. We find that in both cases the asymmetry is diluted when increasing the energy of the decaying kaons.

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