6533b82ffe1ef96bd12952f5
RESEARCH PRODUCT
LAB observables for the muon polarization in K+->pi(+)mu(+)mu(-)
J. VidalD. Gómez Dummsubject
PhysicsNuclear and High Energy PhysicsParticle physicsMuonmedia_common.quotation_subjectObservablePolarization (waves)AsymmetryPartícules (Física nuclear)Standard ModelHigh Energy Physics - PhenomenologyPiPhysics::Accelerator PhysicsHigh Energy Physics::ExperimentSensitivity (control systems)media_commondescription
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.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 1999-07-23 |