Complex Singlet Extension of the Standard Model

By V. Barger, P. Langacker, M. McCaskey, M. Ramsey-Musolf, G. Shaughnessy. 2008

320 citations recorded by the source corpus.

We analyze a simple extension of the standard model (SM) obtained by adding a complex singlet to the scalar sector (cxSM). We show that the cxSM can contain one or two viable cold dark matter candidates and analyze the conditions on the parameters of the scalar potential that yield the observed relic density. When the cxSM potential contains a global U(1) symmetry that is both softly and spontaneously broken, it contains both a viable dark matter candidate and the ingredients necessary for a strong first order electroweak phase transition as needed for electroweak baryogenesis. We also study the implications of the model for discovery of a Higgs boson at the Large Hadron Collider.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/450687ad91e638a7b7b7fb6839a28d5ecda4e8c0

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Citations in the corpus

Probing the Standard Model with Higgs signal rates from the Tevatron, the LHC and a future ILC (2014, background): “Although this scenario seems to be overly simplistic it actually represents realistic physics models, such as the extension of the SM Higgs sector by a real or complex scalar singlet [96, 116–124].”
The effects of QCD equation of state on the relic density of WIMP dark matter (2015, background): “This not only hints at a deep connection between DM and extensions of the SM addressing some of its shortcomings [10–14], it also allows various ways in which the existence of WIMP DM can be probed.”
Physics at a 100 TeV pp collider: Higgs and EW symmetry breaking studies (2016, background): “An special case occurs when φ is a complex singlet [290,320,356].”
ScannerS: constraining the phase diagram of a complex scalar singlet at the LHC (2013, background): “In the first model, which we called model 0, one of the phases leads to a massless dark matter candidate which is already excluded by the Bullet Cluster results.”
micrOMEGAs_3: A program for calculating dark matter observables (2013, background): “This occur for example when the DM particle is a Dirac fermion [35] or a complex scalar [36, 37].”
Higgs portal, fermionic dark matter, and a Standard Model like Higgs at 125 GeV (2012, background): “An interesting possibility is that the coupling of dark and visible sectors is through a Higgs portal [1–18].”
Higgs Physics at the HL-LHC and HE-LHC (2019, background): “[524, 525, 526, 527] and [528, 529, 530, 531, 532, 533] for models with and without supersymmetry).”
Implications of the 125 GeV Higgs boson for scalar dark matter and for the CMSSM phenomenology (2011, methodology): “ have been already addressed in the 125 GeV Higgs boson scenario [26].2 2.1 Scalar singlet model The simplest DM model is obtained by extending the SM scalar potential with a real [28{ 31] or complex [32] singlet scalar eld. In view of embedding this scenario into a GUT framework [33], we study the ”