Christoph Englert
Higgs characterisation in the presence of theoretical uncertainties and invisible decays
Englert, Christoph; Kogler, Roman; Schulz, Holger; Spannowsky, Michael
Authors
Abstract
While the Higgs characterisation programme is well under way, direct signs for new physics beyond the Standard Model remain elusive. Performing a fit of fully differential Higgs production cross sections at the LHC to a subset of Higgs-relevant effective operators, we discuss the extent to which theoretical uncertainties can limit the sensitivity in such a new physics search programme. Extending the dimension-6 Higgs Effective Field Theory framework by introducing new light degrees of freedom that can contribute to an invisible (or undetectable) Higgs decay width h→ϕϕh→ϕϕ , we show how differential coupling fits can disentangle effects from non-Standard Model couplings and an invisible decay width, as present in many new physics scenarios, such as Higgs-portal dark matter. Including the so-called off-shell measurement that has been advocated as a sensitive determination of the Higgs width in the κκ framework, we show explicitly that this method does not provide complementary sensitivity for scale-separated new physics Λ≫mh≫mϕΛ≫mh≫mϕ , which is favoured in beyond the Standard Model scenarios that relate astrophysics and collider phenomenology in the light of non-observation of new physics during run 1 of the LHC.
Citation
Englert, C., Kogler, R., Schulz, H., & Spannowsky, M. (2017). Higgs characterisation in the presence of theoretical uncertainties and invisible decays. The European Physical Journal C, 77(11), Article 789. https://doi.org/10.1140/epjc/s10052-017-5366-8
Journal Article Type | Article |
---|---|
Acceptance Date | Nov 4, 2017 |
Online Publication Date | Nov 21, 2017 |
Publication Date | Nov 21, 2017 |
Deposit Date | Dec 13, 2017 |
Publicly Available Date | Mar 29, 2024 |
Journal | European Physical Journal C: Particles and Fields |
Print ISSN | 1434-6044 |
Electronic ISSN | 1434-6052 |
Publisher | SpringerOpen |
Peer Reviewed | Peer Reviewed |
Volume | 77 |
Issue | 11 |
Article Number | 789 |
DOI | https://doi.org/10.1140/epjc/s10052-017-5366-8 |
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Copyright Statement
© The Author(s) 2017 Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. Funded by SCOAP3
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