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Higgs characterisation in the presence of theoretical uncertainties and invisible decays

Englert, Christoph; Kogler, Roman; Schulz, Holger; Spannowsky, Michael

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Christoph Englert

Roman Kogler

Holger Schulz


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.


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.

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 Dec 13, 2017
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


Published Journal Article (709 Kb)

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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 (, 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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