PoS - Proceedings of Science
Volume 414 - 41st International Conference on High Energy physics (ICHEP2022) - Poster Session
Between even and odd: probing the CP nature of the Higgs-top Yukawa coupling
A.L. Moreira de Carvalho
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Pre-published on: October 19, 2022
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As we enter the era of precision at the LHC, excluding specific charge-parity (CP) scenarios is no longer enough: we want to detect and precisely measure the angle that determines the possible admixture of CP-even and CP-odd components in the Higgs-top Yukawa coupling. The Higgs boson production in association with top-quarks (ttH and tH), in the H to bb decay channel, offers a unique possibility to study this interaction, since it depends only on Yukawa couplings and relies on the tree-level couplings between the Higgs and the fermions. Targeting events where one or both top quarks decay leptonically provides a handle to reconstruct the top-quarks, whose four-momenta can be used to construct CP-sensitive observables. In this communication, the first measurement of the CP-mixing angle in the ttH(H->bb) channel using the full Run 2 dataset collected by the ATLAS experiment will be presented.
DOI: https://doi.org/10.22323/1.414.1048
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