Englert, C. , Galler, P. , Pilkington, A. and Spannowsky, M. (2019) Approaching robust EFT limits for CP violation in the Higgs sector. Physical Review D, 99(9), 095007. (doi: 10.1103/PhysRevD.99.095007)
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Abstract
Constraining CP-violating interactions in effective field theory (EFT) of dimension six faces two challenges. Firstly, degeneracies in the multi-dimensional space of Wilson coefficients have to be lifted. Secondly, 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 EFT 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.
| Item Type: | Articles |
|---|---|
| Status: | Published |
| Refereed: | Yes |
| Glasgow Author(s) Enlighten ID: | Galler, Dr Peter and Englert, Professor Christoph |
| Authors: | Englert, C., Galler, P., Pilkington, A., and Spannowsky, M. |
| College/School: | College of Science and Engineering > School of Physics and Astronomy |
| Journal Name: | Physical Review D |
| Publisher: | American Physical Society |
| ISSN: | 2470-0010 |
| ISSN (Online): | 2470-0029 |
| Published Online: | 13 May 2019 |
| Copyright Holders: | Copyright © 2019 American Physical Society |
| First Published: | First published in Physical Review D 99(9): 095007 |
| Publisher Policy: | Reproduced under a Creative Commons License |
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