Franconi, Laura; Haug, Sigve; Weber, Michele; Anders, John Kenneth; Fehr, Armin; Beck, Hans Peter; Ereditato, Antonio; Miucci, Antonio; Lehmann, Niklaus; Weston, Thomas Daniel (2020). CP Properties of Higgs Boson Interactions with Top Quarks in the t\bartH and tH Processes Using H → γγ with the ATLAS Detector. Physical review letters, 125(6) American Physical Society 10.1103/PhysRevLett.125.061802
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A study of the charge conjugation and parity (CP) properties of the interaction between the Higgs boson and top quarks is presented. Higgs bosons are identified via the diphoton decay channel (H→γγ), and their production in association with a top quark pair (t¯tH) or single top quark (tH) is studied. The analysis uses 139 fb−1 of proton–proton collision data recorded at a center-of-mass energy of √s=13 TeV with the ATLAS detector at the Large Hadron Collider. Assuming a CP-even coupling, the t¯tH process is observed with a significance of 5.2 standard deviations. The measured cross section times H→γγ branching ratio is 1.64+0.38−0.36(stat)+0.17−0.14(sys) fb, and the measured rate for t¯tH is 1.43+0.33−0.31(stat)+0.21−0.15(sys) times the Standard Model expectation. The tH production process is not observed and an upper limit on its rate of 12 times the Standard Model expectation is set. A CP-mixing angle greater (less) than 43 (−43)° is excluded at 95% confidence level.
Item Type: |
Journal Article (Original Article) |
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Division/Institute: |
08 Faculty of Science > Physics Institute > Laboratory for High Energy Physics (LHEP) 08 Faculty of Science > Physics Institute 10 Strategic Research Centers > Albert Einstein Center for Fundamental Physics (AEC) |
UniBE Contributor: |
Franconi, Laura, Haug, Sigve, Weber, Michele, Anders, John Kenneth, Ilg, Armin, Beck, Hans Peter, Ereditato, Antonio, Miucci, Antonio, Lehmann, Niklaus, Weston, Thomas Daniel |
Subjects: |
500 Science > 530 Physics |
ISSN: |
0031-9007 |
Publisher: |
American Physical Society |
Language: |
English |
Submitter: |
BORIS Import LHEP |
Date Deposited: |
21 Apr 2021 15:00 |
Last Modified: |
02 Mar 2023 23:34 |
Publisher DOI: |
10.1103/PhysRevLett.125.061802 |
Additional Information: |
Kollaboration - Es sind nur die Berner Autoren namentlich erwaehnt |
BORIS DOI: |
10.48350/155570 |
URI: |
https://boris.unibe.ch/id/eprint/155570 |
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