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Higgs characterisation in the presence of theoretical uncertainties and invisible decays.

Englert, Christoph and Kogler, Roman and Schulz, Holger and Spannowsky, Michael (2017) 'Higgs characterisation in the presence of theoretical uncertainties and invisible decays.', European physical journal C., 77 (11). p. 789.


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.

Item Type:Article
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Publisher 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
Date accepted:04 November 2017
Date deposited:13 December 2017
Date of first online publication:21 November 2017
Date first made open access:13 December 2017

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