Higgs-Z Mixing and Resonant CP Violation at mu+ mu- Colliders

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  • 17 March 1996
Abstract
A mu+ mu- collider is an appealing machine to probe resonant CP-violating transitions between a CP-even Higgs particle and the Z boson or between Higgs scalars with different CP quantum numbers. The size of the CP-violating effects is estimated by using an observable of CP asymmetry based on longitudinally polarized muons. These phenomena are studied within a manifestly gauge-invariant approach implemented by the pinch technique, which respects the discrete symmetries of the classical Lagrangian and is therefore free from CP-odd gauge artifacts. The CP invariance of an extended Higgs sector motivated by E_6 supersymmetric models is assumed to be broken by the presence of heavy Majorana fermions. CP violation originating from Higgs-Z mixing is found to be very modest, whereas CP-number violating transitions involving Higgs scalars only can be resonantly enhanced up to order of unity.

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