Sensitivity to CP $$ \mathcal{CP} $$ -violating effective couplings in the top-Higgs sector
Abstract The observed baryon asymmetry of the Universe requires new sources of charge-parity ( CP $$ \mathcal{CP} $$ ) violation beyond those in the Standard Model. In this work, we investigate CP $$ \mathcal{CP} $$ -violating effects in the top-Higgs sector using the Standard Model Effective Field...
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| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
SpringerOpen
2025-06-01
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| Series: | Journal of High Energy Physics |
| Subjects: | |
| Online Access: | https://doi.org/10.1007/JHEP06(2025)052 |
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| Summary: | Abstract The observed baryon asymmetry of the Universe requires new sources of charge-parity ( CP $$ \mathcal{CP} $$ ) violation beyond those in the Standard Model. In this work, we investigate CP $$ \mathcal{CP} $$ -violating effects in the top-Higgs sector using the Standard Model Effective Field Theory (SMEFT) framework. Focusing on top-pair production in association with a Higgs boson and single top-Higgs associated production at the LHC, we study CP $$ \mathcal{CP} $$ violation in the top-Higgs Yukawa coupling and other Higgs and top interactions entering these processes. By analysing CP $$ \mathcal{CP} $$ -sensitive differential observables and asymmetries, we provide direct constraints on CP $$ \mathcal{CP} $$ -violating interactions in the top-Higgs sector. Our analysis demonstrates how combining t t ¯ h $$ t\overline{t}h $$ and thj production can disentangle the real and imaginary components of the top-Yukawa coupling, offering valuable insights into potential sources of CP $$ \mathcal{CP} $$ violation. The sensitivity of these observables to SMEFT operators provides model-independent constraints on the parameter space, advancing the search for new physics in the top-Higgs sector. |
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| ISSN: | 1029-8479 |