Approaching robust EFT limits for CP violation in the Higgs sector

Englert, Christoph; Galler, Peter; Pilkington, Andrew; Spannowsky, Michael

doi:10.1103/physrevd.99.095007

Approaching robust EFT limits for CP violation in the Higgs sector Thumbnail

Authors

Christoph Englert

Peter Galler

Andrew Pilkington

Professor Michael Spannowsky michael.spannowsky@durham.ac.uk
Professor

Abstract

Constraining CP-violating interactions in effective field theory of dimension six faces two challenges. First, degeneracies in the multidimensional space of Wilson coefficients have to be lifted. Second, quadratic contributions of CP-odd dimension-six operators are difficult to disentangle from squared contributions of CP-even dimension-six operators and from linear contributions of dimension-eight operators. Both of these problems are present when new sources of CP violation are present in the interactions between the Higgs boson and heavy strongly interacting fermions. We show that degeneracies in the Wilson coefficients can be removed by combining measurements of Higgs-plus-two-jet production via gluon fusion with measurements of top-pair associated Higgs production. In addition, we demonstrate that the sensitivity of the analysis can be improved by exploiting the top-quark threshold in the gluon fusion process. Finally, we substantiate a perturbative argument about the validity of effective field theory by comparing the quadratic and linear contributions from CP-odd dimension-six operators and use this to show explicitly that high statistics measurements at future colliders enable the extraction of perturbatively robust constraints on the associated Wilson coefficients.

Citation

Englert, C., Galler, P., Pilkington, A., & Spannowsky, M. (2019). Approaching robust EFT limits for CP violation in the Higgs sector. Physical Review D, 99(9), Article 095007. https://doi.org/10.1103/physrevd.99.095007

Journal Article Type	Article
Online Publication Date	May 13, 2019
Publication Date	May 1, 2019
Deposit Date	Jun 6, 2019
Publicly Available Date	Jun 6, 2019
Journal	Physical Review D
Print ISSN	2470-0010
Electronic ISSN	2470-0029
Publisher	American Physical Society
Peer Reviewed	Peer Reviewed
Volume	99
Issue	9
Article Number	095007
DOI	https://doi.org/10.1103/physrevd.99.095007

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