Using decay angle correlations to detect CP violation in the neutral Higgs sector

We demonstrate that decay angle correlations in τ−τ+ and tt decay modes could allow a determination of whether or not a neutral Higgs boson is a CP eigenstate. Sensitivity of the correlations is illustrated in the case of the e+e− → ZH and μ+μ− → H production processes for a two-doublet Higgs model with CP-violating neutral sector. A very useful technique for minimizing ‘depolarization-factor’ suppressions of the correlations in the tt mode is introduced.