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LAB observables for the muon polarization in K+->pi(+)mu(+)mu(-)

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LAB observables for the muon polarization in K+->pi(+)mu(+)mu(-)

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Gómez Dumm, Daniel; Vidal Perona, Jorge Perfil

This document is a artículoDate1999

Este documento está disponible también en : http://dx.doi.org/10.1016/S0370-2693(99)00997-1

Este documento está disponible también en : http://hdl.handle.net/10550/32685

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.

Gómez Dumm, Daniel Vidal Perona, Jorge 1999 LAB observables for the muon polarization in K+->pi(+)mu(+)mu(-) Physics Letters B 463 2-4 309 316

http://dx.doi.org/10.1016/S0370-2693(99)00997-1