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arXiv · 2203.08127

Directly Probing the CP-structure of the Higgs-Top Yukawa at HL-LHC and Future Colliders

Rahool Kumar Barman·Morgan E. Cassidy·Zhongtian Dong·Dorival Gonçalves·Jeong Han Kim·Felix Kling·Kyoungchul Kong·Ian M. Lewis·Yongcheng Wu·Yanzhe Zhang·Ya-Juan Zheng
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Abstract

Constraining the Higgs boson properties is a cornerstone of the LHC program and future colliders. In this Snowmass contribution, we study the potential to directly probe the Higgs-top CP-structure via the $t\bar{t}h$ production at the HL-LHC, 100 TeV FCC and muon colliders. We find the limits on the CP phase ($\alpha$) at 95% CL are $|\alpha| \lesssim 36^\circ$ with dileptonic $t\bar t (h\to b\bar b) $ and $|\alpha| \lesssim 25^\circ$ with combined $t\bar t (h\to \gamma\gamma) $ at the HL-LHC. The 100 TeV FCC brings a significant improvement in sensitivity with $|\alpha| \lesssim 3^\circ$ for the dileptonic $t\bar t (h\to b\bar b) $, due to the remarkable gain in the signal cross-section and the increased luminosity. At future muon colliders, we find that the bounds with semileptonic $t\bar t (h\to b\bar b) \nu\bar\nu$ are $|\alpha| \lesssim 9^\circ$ for 10 TeV and $|\alpha| \lesssim 3^\circ$ for 30 TeV, respectively.

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Rahool Kumar Barman, Morgan E. Cassidy, Zhongtian Dong, Dorival Gonçalves, Jeong Han Kim, Felix Kling, Kyoungchul Kong, Ian M. Lewis, Yongcheng Wu, Yanzhe Zhang, Ya-Juan Zheng. 2022-03-15. Directly Probing the CP-structure of the Higgs-Top Yukawa at HL-LHC and Future Colliders. https://arxiv.org/abs/2203.08127

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