Global fit to Higgs signal strengths and couplings and implications for extended Higgs sectors

By G. Bélanger, B. Dumont, Ulrich Ellwanger, J. Gunion, Sabine Kraml. 2013

270 citations recorded by the source corpus.

The most recent LHC data have provided a considerable improvement in the precision with which various Higgs production and decay channels have been measured. Using all available public results from ATLAS, CMS and the Tevatron, we derive for each final state the combined confidence level contours for the signal strengths in the (gluon fusion + ttH associated production) versus (vector boson fusion + VH associated production) space. These “combined signal strength ellipses” can be used in a simple, generic way to constrain a very wide class of New Physics models in which the couplings of the Higgs boson deviate from the Standard Model prediction. Here, we use them to constrain the reduced couplings of the Higgs boson to up-quarks, down-quarks/leptons and vector boson pairs. We also consider New Physics contributions to the loop-induced gluon-gluon and photon-photon couplings of the Higgs, as well as invisible/unseen decays. Finally, we apply our fits to some simple models with an extended Higgs sector, in particular to Two-Higgs-Doublet models of Type I and Type II, the Inert Doublet model, and the Georgi–Machacek triplet Higgs model.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/05ff10f113c1bccf2deb5727bde30fdfb52b86dc

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In Nuclear and High Energy Physics

Citations in the corpus

Limiting two-Higgs-doublet models (2014, result): “measured signal strengths and production cross section of such a particle are in very good agreement with the corresponding SM predictions [18–34].”
Probing the Standard Model with Higgs signal rates from the Tevatron, the LHC and a future ILC (2014, background): “We want to note that an alternative approach for transferring the experimental results into global Higgs coupling or model fits exists [28, 85].”
Building and testing models with extended Higgs sectors (2017, unknown): “Some studies tested the LHC Higgs data against not only 2HDM but also other examples of extended Higgs sectors [280, 281, 282].”
The hunt for the rest of the Higgs bosons (2015, background): “We first summarize the state of limits on 2HDM at the LHC from direct searches for additional Higgs states and indirect constraints from Higgs coupling measurements (for recent related work, see [14, 22–40]).”
An updated analysis of Inert Higgs Doublet Model in light of the recent results from LUX, PLANCK, AMS-02 and LHC (2013, background): “limit on the invisible Higgs decay branching ratio moves up to 29% [27].”
A facility to search for hidden particles at the CERN SPS: the SHiP physics case (2015, background): “If it is assumed that the Higgs couplings to all SM states are precisely as predicted in the SM then LHC observations of the Higgs boson already place strong bounds on the invisible decay width of the Higgs boson, placing the branching ratio at BRS < 19% [278].”