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Angles on CP-violation in Higgs boson interactions

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arxiv 1808.06577 v2 pith:NLIO6CBC submitted 2018-08-20 hep-ph hep-ex

Florian U. Bernlochner , Christoph Englert , Chris Hays , Kristin Lohwasser , Hannes Mildner , Andrew Pilkington , Darren D. Price , Michael Spannowsky This is my paper · ORCID
classification hep-phhep-ex
keywords higgsbosoncp-violatingconstraintscp-violationeffectsinteractionsmeasurements
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abstract

CP-violation in the Higgs sector remains a possible source of the baryon asymmetry of the universe. Recent differential measurements of signed angular distributions in Higgs boson production provide a general experimental probe of the CP structure of Higgs boson interactions. We interpret these measurements using the Standard Model Effective Field Theory and show that they do not distinguish the various CP-violating operators that couple the Higgs and gauge fields. However, the constraints can be sharpened by measuring additional CP-sensitive observables and exploiting phase-space-dependent effects. Using these observables, we demonstrate that perturbatively meaningful constraints on CP-violating operators can be obtained at the LHC with luminosities of ${\cal{O}}$(100/fb). Our results provide a roadmap to a global Higgs boson coupling analysis that includes CP-violating effects.

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Cited by 2 Pith papers

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