Englert, C. , Giudice, G. F., Greljo, A. and McCullough, M. (2019) The Ĥ-parameter: an oblique Higgs view. Journal of High Energy Physics, 2019(9), 41. (doi: 10.1007/JHEP09(2019)041)
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Abstract
We study, from theoretical and phenomenological angles, the Higgs boson oblique parameter Ĥ, as the hallmark of off-shell Higgs physics. Ĥ is defined as the Wilson coefficient of the sole dimension-6 operator that modifies the Higgs boson propagator, within a Universal EFT. Theoretically, we describe self-consistency conditions on Wilson coefficients, derived from the Källén-Lehmann representation. Phenomenologically, we demonstrate that the process gg → h∗ → V V is insensitive to propagator corrections from Ĥ, and instead advertise four-top production as an effective high-energy probe of off-shell Higgs behaviour, crucial to break flat directions in the EFT.
| Item Type: | Articles |
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| Status: | Published |
| Refereed: | Yes |
| Glasgow Author(s) Enlighten ID: | Englert, Professor Christoph |
| Authors: | Englert, C., Giudice, G. F., Greljo, A., and McCullough, M. |
| College/School: | College of Science and Engineering > School of Physics and Astronomy |
| Journal Name: | Journal of High Energy Physics |
| Publisher: | Springer |
| ISSN: | 1126-6708 |
| ISSN (Online): | 1029-8479 |
| Published Online: | 06 September 2019 |
| Copyright Holders: | Copyright © 2019 The Authors |
| First Published: | First published in Journal of High Energy Physics 9:41 |
| Publisher Policy: | Reproduced under a Creative Commons License |
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