Search for CP violation in t$$\overline{\textrm{t}}$$H and tH production in multilepton channels in proton-proton collisions at $$\sqrt{s}$$ = 13 TeV
Journal Article
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· Journal of High Energy Physics (Online)
The charge-parity (CP) structure of the Yukawa interaction between the Higgs (H) boson and the top quark is measured in a data sample enriched in the t$$\overline{t}$$H and tH associated production, using 138 fb-1 of data collected in proton-proton collisions at $$\sqrt{s}$$ = 13 TeV by the CMS experiment at the CERN LHC. The study targets events where the H boson decays via H → WW or H → ττ and the top quarks decay via t → Wb: the W bosons decay either leptonically or hadronically, and final states characterized by the presence of at least two leptons are studied. Machine learning techniques are applied to these final states to enhance the separation of CP -even from CP -odd scenarios. Two-dimensional confidence regions are set on $$κ$$t and $$\widetilde{k}$$t, which are respectively defined as the CP -even and CP -odd top-Higgs Yukawa coupling modifiers. No significant fractional CP -odd contributions, parameterized by the quantity |$$f^{Htt}_{CP}$$| are observed; the parameter is determined to be |$$f^{Htt}_{CP}$$| = 0.59 with an interval of (0.24, 0.81) at 68% confidence level. The results are combined with previous results covering the H → ZZ and H → γγ decay modes, yielding two- and one-dimensional confidence regions on $$κ$$t and $$\widetilde{k}$$t, while |$$f^{Htt}_{CP}$$| is determined to be |$$f^{Htt}_{CP}$$| = 0.28 with an interval of |$$f^{Htt}_{CP}$$| < 0.55 at 68% confidence level, in agreement with the standard model CP -even prediction of |$$f^{Htt}_{CP}$$| = 0.
- Research Organization:
- Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), High Energy Physics (HEP)
- Contributing Organization:
- CMS Collaboration
- Grant/Contract Number:
- AC02-07CH11359
- OSTI ID:
- 2217209
- Report Number(s):
- CERN-EP-2022-157; CMS-HIG-21-006; FERMILAB-PUB--23-719-CMS; arXiv:2208.02686; oai:inspirehep.net:2132369
- Journal Information:
- Journal of High Energy Physics (Online), Journal Name: Journal of High Energy Physics (Online) Journal Issue: 7 Vol. 2023; ISSN 1029-8479
- Publisher:
- Springer NatureCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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Measurement of the $\textrm{t}\overline{\textrm{t}}\textrm{H}$ and tH production rates in the H → $\textrm{b}\overline{\textrm{b}}$ decay channel using proton-proton collision data at $\sqrt{s}$ = 13 TeV
Journal Article
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Thu Feb 13 19:00:00 EST 2025
· Journal of High Energy Physics (Online)
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OSTI ID:3007080