Vacuum structure and stability of a singlet fermion dark matter model with a singlet scalar messenger

Baek, Seungwon; Ko, Pyungwon; Park, Wan-Il; Senaha, Eibun

doi:10.1007/jhep11(2012)116

Cited by 111 publications

(127 citation statements)

References 61 publications

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“…Even if we relax the assumption of the local dark gauge symmetry and consider more phenomenological Higgs-portal DM models, there will still appear a singlet scalar boson that can mix with the SM Higgs boson, if the Higgs-portal DM is a singlet Dirac fermion [28,29] or a vector boson [16,30,31]. Also, it can play an important role in DM phenomenology.…”

Section: Dark Matter Models With Dark Gauge Symmetries And/or Higgs Pmentioning

confidence: 99%

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Bounds on Higgs-portal models from the LHC Higgs data

Cheung

Ko²,

Lee

et al. 2015

J. High Energ. Phys.

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In a number of Higgs-portal models, an SU(2) isospin-singlet scalar boson generically appears at the electroweak scale and can mix with the Standard Model (SM) Higgs boson with a mixing angle α. This singlet scalar boson can have renormalizable couplings to a pair of dark matter particles, vector-like leptons or quarks, or new gauge bosons, thereby modifying the Higgs signal strengths in a nontrivial way. In this work, we perform global fits to such models using the most updated LHC Higgs-boson data and discuss the corresponding implications on Higgs-portal-type models. In particular we find that the current LHC Higgs-boson data slightly favors the SM over the Higgs-portal singlet-scalar models, which has to be further examined using the upcoming LHC Higgsboson data. Finally, without non-SM particles contributing to the Hγγ and Hgg vertices, the Higgs-portal models are constrained as follows: cos α 0.86 and ∆Γ tot 1.24 MeV at 95% confidence level (CL).

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Section: Dark Matter Models With Dark Gauge Symmetries And/or Higgs Pmentioning

confidence: 99%

“…• The additional singlet scalar boson can improve the stability of EW vacuum up to the Planck scale [29].…”

Section: Jhep10(2015)057mentioning

confidence: 99%

Bounds on Higgs-portal models from the LHC Higgs data

Cheung

Ko²,

Lee

et al. 2015

J. High Energ. Phys.

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“…Since the stability condition of the electroweak vacuum is strongly sensitive to new physics, from the phenomenological point of view it is clear that beyond SM physics models have to pass a sort of "stability test" [21][22][23]. Indeed, only new physics models that reinforce the requirement of a stable or metastable (but with τ > T U ) electroweak vacuum can be accepted as a viable UV completion of the SM [24][25][26][27][28][29][30][31][32][33][34][35].…”

Section: Introductionmentioning

confidence: 99%

Majorana dark matter through the Higgs portal under the vacuum stability lamppost

et al. 2015

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We study the vacuum stability of a minimal Higgs portal model in which the standard model (SM) particle spectrum is extended to include one complex scalar field and one Dirac fermion. These new fields are singlets under the SM gauge group and are charged under a global U (1) symmetry. Breaking of this U (1) symmetry results in a massless Goldstone boson, a massive CPeven scalar, and splits the Dirac fermion into two new mass-eigenstates, corresponding to Majorana fermions. The lightest Majorana fermion (w) is absolutely stable, providing a plausible dark matter (DM) candidate. We show that interactions between the Higgs sector and the lightest Majorana fermion which are strong enough to yield a thermal relic abundance consistent with observation can easily destabilize the electroweak vacuum or drive the theory into a non-perturbative regime at an energy scale well below the Planck mass. However, we also demonstrate that there is a region of the parameter space which develops a stable vacuum (up to the Planck scale), satisfies the relic abundance, and is in agreement with direct DM searches. Such an interesting region of the parameter space corresponds to DM masses 350 GeV mw 1 TeV. The region of interest is within reach of second generation DM direct detection experiments.

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“…For example, in Refs. [52][53][54], the authors demonstrated that the effective Lagrangian approaches based on the unbroken subgroup (SU (3) C ×U (1) Y ) of the SM gauge group produce erroneous results, especially on the direct detection cross section through the Higgs couplings to the dark matter particles. In the renormalizable versions of hidden sector (or Higgs-portal) DM models with the full SM gauge group (SU (3) c × SU (2) L × U (1) Y ), one always have an extra singlet scalar s which couples to the hidden sector DM particles at renormalizable level.…”

Section: Introductionmentioning

confidence: 99%

“…And the mixing of this singlet scalar s with the SM Higgs h thermalize the hidden sector DMs. Due to the mixing between the h and s, there are always at least two neutral Higgslike scalar bosons, which are mixtures of the SM Higgs h (remnant of the SU (2) L doublet Higgs field) and a singlet scalar s. The singlet scalar s not only thermalizes the hidden sector DM efficiently, but also improves the stability of the EW vacuum up to Planck scale [53], unlike the SM case. It is important to realize that one can not integrate out the singlet scalar s simply assuming that s is very heavy.…”

Section: Introductionmentioning

confidence: 99%

Implications of LHC data on 125 GeV Higgs-like boson for the Standard Model and its various extensions

Choi

Jung

2013

J. High Energ. Phys.

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Recent data on 125 GeV Higgs-like boson at the LHC starts to constrain the electroweak symmetry breaking (EWSB) sector of the SM and its various extensions. If one imposes the local gauge symmetry of the Standard Model (SM) (SU (3) c ×SU (2) L ×U (1) Y ) to the SM and any possible new physics scenarios, the SM Higgs properties will be modified by intrinsically two different ways: by new physics either coupling directly to the SM Higgs boson h, or affecting indirectly the SM Higgs properties through the mixing of h with a SM singlet scalar s. (Here s is a singlet under the SM gauge group, but may be charged under a new gauge charge and can have nonrenormalizable couplings to non-SM particles.) The models of two Higgs doublet, extra sequential and mirror fermions belong to the first category, whereas the models with a hidden sector dark matter, extra vectorlike fermions and new charged vector bosons, which can enhance the diphoton rate of the SM Higgs-like resonance, belong to the second category. We perform a global fit to data in terms of the effective Lagrangian description of two interaction eigenstates of scalar bosons, a SM Higgs and a singlet scalar, and their mixing. This framework is more suitable to study singlet-extended scenarios discussed above compared to other approaches based on the Lagrangian of mass eigenstates. With fairly model-independent assumptions, the effective Lagrangian contains at most four free parameters still encompassing the majority of models in the literature. Interestingly, the SM gives the best fit if all data from ATLAS and CMS are used, whereas various singlet extensions can fit better to individual ATLAS or CMS data. Without further assumptions, an upper bound on the total width (or, nonstandard branching ratio) is generically obtained. Furthermore, global fit based on our parameterization can be used to probe interactions of the singlet scalar if the singlet resides below 2m W .

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Vacuum structure and stability of a singlet fermion dark matter model with a singlet scalar messenger

Cited by 111 publications

References 61 publications

Bounds on Higgs-portal models from the LHC Higgs data

Bounds on Higgs-portal models from the LHC Higgs data

Majorana dark matter through the Higgs portal under the vacuum stability lamppost

Implications of LHC data on 125 GeV Higgs-like boson for the Standard Model and its various extensions

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