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

A. Soni (BNL); D. Atwood (SLAC); G. Eilam (Technion); R.R. Mendel (Univ. of Western Ontario); S. Bar-Shalom (Technion)

arxiv: hep-ph/9508314 · v1 · submitted 1995-08-16 · ✦ hep-ph

Large Tree Level CP Violation in e^+e^-to tbar{t}H⁰ in The Two Higgs Doublet Model

S. Bar-Shalom (Technion) , D. Atwood (SLAC) , G. Eilam (Technion) , R.R. Mendel (Univ. of Western Ontario) , A. Soni (BNL) This is my paper

classification ✦ hep-ph

keywords levelviolationemissionlargetreealreadyarisesbest

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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$\sigma$ level.

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Large Tree Level CP Violation in e^+e^-to tbar{t}H⁰ in The Two Higgs Doublet Model

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