Search for the Higgs portal to a singlet fermionic dark matter at the LHC

By S. Baek, P. Ko, Wan-il Park. 2011

176 citations recorded by the source corpus.

A bstractWe consider a simple extension of the standard model with a singlet fermionic dark matter. Its thermal relic density can be easily accommodated by a real singlet scalar messenger that mixes with the standard model Higgs boson. The model can change significantly the Higgs signals at the LHC via sizable invisible decays of two Higgs-like scalar bosons. After imposing the constraints from the electroweak precision tests, colliders and dark matter search experiments, one concludes that two or one or none of the two Higgs bosons, depending on the mass relations among two scalar bosons and the dark matter fermion and their couplings. In particular, if a standard model Higgs-like scalar boson is discovered around 120-125 GeV region at the LHC, it would be almost impossible to find the second Higgs-like boson since it is mostly a singlet scalar, whether it is heavier or lighter. This model can be further tested by direct dark matter search experiments.

Subfields: Artificial Intelligence, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/04b6b785adb19ce4e13440755b89c23eafb303ad

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Citations in the corpus

Implications of the 125 GeV Higgs boson for scalar dark matter and for the CMSSM phenomenology (2011, background): “ + iS A)= p 2, but the phenomenology in the real singlet case is similar. The vacuum stability of the real singlet model has previously been studied in [31]. 2Singlet fermion DM has also been studied [27]. { 3 { Denoting the SM Higgs boson with H 1;the most general Lagrangian invariant under the Z 2”
Dark Matter through the Higgs portal (2019, background): “For instance, an additional Higgs singlet field that acquires a vacuum expectation value and mixes with the SM–like Higgs field allows for a renormalisable coupling with an isosinglet fermion state [63–66, 118–123].”
Higgs portal, fermionic dark matter, and a Standard Model like Higgs at 125 GeV (2012, methodology): “SM-like Higgs hwith m H 1 = 125 GeV, we will use the notion of signal strength reduction factor in the event number of a specic nal state of the Standard Model, X, in the Higgs boson decay, see e.g. [15,28,39]. The latter is dened as: r i ˙ H i Br H!X ˙ SM H i Br H!X (20) with i = 1;2 and where ˙ H ”
On naturalness of the MSSM and NMSSM (2012, background): “, the SM Higgs sector extended with an extra scalar singlet in the context of dark matter models [50–53].”