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CP Properties of Higgs Boson Interactions with Top Quarks in the tt¯H and tH Processes Using H→γγ with the ATLAS Detector: Physical review letters

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Published
Article number061802
<mark>Journal publication date</mark>5/08/2020
<mark>Journal</mark>Physical review letters
Issue number6
Volume125
Number of pages21
Publication StatusPublished
<mark>Original language</mark>English

Abstract

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 (tt¯H) 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 tt¯H process is observed with a significance of 5.2 standard deviations. The measured cross section times H→γγ branching ratio is 1.64-0.36 +0.38(stat)-0.14+0.17(sys)  fb, and the measured rate for tt¯H is 1.43-0.31+0.33(stat)-0.15+0.21(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.

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Export Date: 9 September 2020