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Angles on CP-violation in Higgs boson interactions.

Bernlochner, Florian U. and Englert, Christoph and Hays, Chris and Lohwasser, Kristin and Mildner, Hannes and Pilkington, Andrew and Price, Darren D. and Spannowsky, Michael (2019) 'Angles on CP-violation in Higgs boson interactions.', Physics letters B., 790 . pp. 372-379.


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 (100/fb). Our results provide a roadmap to a global Higgs boson coupling analysis that includes CP-violating effects.

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Publisher statement:© 2019 Published by Elsevier B.V. This is an open access article under the CC-BY license ( Funded by SCOAP3.
Date accepted:21 January 2019
Date deposited:13 February 2019
Date of first online publication:28 January 2019
Date first made open access:13 February 2019

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