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Large Tree Level CP Violation in $e^+e^-\to t\bar{t}H^0$ in The Two Higgs Doublet Model

S. Bar-Shalom·D. Atwood·G. Eilam·R. R. Mendel·A. Soni
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Abstract

We find a large CP violation effect within the Two-Higgs-Doublet-Model for the reaction $e^+e^-\to t\bar{t}H^0$ at future linear colliders. The CP-asymmetry arises already at the tree level as a result of interference between diagrams with $H^0$ emission from $t$ (and $\bar{t}$) and its emission from a $Z^0$ and can be about 10--20\%. In the best case one needs a few hundred $t\bar{t}H^0$ events to observe CP violation at the 3$σ$ level.

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S. Bar-Shalom, D. Atwood, G. Eilam, R. R. Mendel, A. Soni. 1995-08-16. Large Tree Level CP Violation in $e^+e^-\to t\bar{t}H^0$ in The Two Higgs Doublet Model. https://doi.org/10.1103/physrevd.53.1162

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