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Higgs characterisation in the presence of theoretical uncertainties and invisible decays.
- Source :
-
European Physical Journal C -- Particles & Fields . Nov2017, Vol. 77 Issue 11, p1-9. 9p. - Publication Year :
- 2017
-
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 $$h\rightarrow \phi \phi $$ , 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 $$\kappa $$ framework, we show explicitly that this method does not provide complementary sensitivity for scale-separated new physics $$\Lambda \gg m_h \gg m_\phi $$ , 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. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 14346044
- Volume :
- 77
- Issue :
- 11
- Database :
- Academic Search Index
- Journal :
- European Physical Journal C -- Particles & Fields
- Publication Type :
- Academic Journal
- Accession number :
- 127695340
- Full Text :
- https://doi.org/10.1140/epjc/s10052-017-5366-8