Probing the CP properties of top Yukawa coupling at an e^+e^- collider
(2018) Journal of High Energy Physics — Vol. JHEP02, p. 180 (2017)
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- Abstract
- We study consequences of CP violation in the htt¯ Yukawa coupling through the process e+e−→ h(125)tt¯. The helicity amplitudes are calculated in the tt¯ rest frame, where the initial e+e− current and the final Higgs boson have the same three-momentum. CP-violating asymmetries appear not only in the azimuthal angle between the e+e− plane and the tt¯ plane about the Higgs momentum direction, but also in the correlated decay angular distributions of t and t¯. Complete description of the production and decay angular distributions are obtained analytically, including both leptonic and hadronic decays of t and t¯. We study the ultimate sensitivity to the CP-violating htt¯ coupling at a few center-of-mass energies. Our analysis shows that the possibility of discovering CP violating htt¯ coupling improves significantly by studying tt¯ decay angular correlations, and more importantly, by increasing its energy upgrade target from s√=500 GeV to 550 GeV.
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Hagiwara, K., & et al. (2018). Probing the CP properties of top Yukawa coupling at an e^+e^- collider. Journal of High Energy Physics, JHEP02, 180. https://doi.org/10.1007/JHEP02(2018)180 (Original work published 2017)