Generalized P and CP transformations of order two in the three-Higgs-doublet model form two equivalence classes for P and a single equivalence class for CP.
CP violation in extended Higgs sectors
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abstract
We discuss how one can identify CP violation (and conservation) in multi-Higgs-doublet potentials. After a brief review of CP violation in the 2HDM, we refer to the fact that for NHDM with $N \geq 3$ the well known methods useful in the case $N = 2$ have not been generalized in order to provide a set of well defined necessary and sufficient conditions for CP conservation. We then present a simple method, proposed by the authors, to be used in such cases. Two non-trivial examples based on an $S_3$-symmetric three-doublet model are analyzed by means of this new method.
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2019 1verdicts
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Generalised P and CP transformations in the 3-Higgs-doublet model
Generalized P and CP transformations of order two in the three-Higgs-doublet model form two equivalence classes for P and a single equivalence class for CP.