Global study of the simplest scalar phantom dark matter model

Cheung, Kingman; Tsai, Yue-Lin Sming; Tseng, Po-Yan; Yuan, Tzu-Chiang; Zee, A.

doi:10.1088/1475-7516/2012/10/042

Cited by 82 publications

(62 citation statements)

References 66 publications

(153 reference statements)

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“…In Sec. II we consider the minimal model in which a single gauge-singlet real scalar is added to the SM [9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28], and show that it cannot explain the observed dark matter self-interaction cross section once we impose the requirement that the annihilation cross section of the singlet scalars into SM particles yields the arXiv:1505.01793v3 [hep-ph] 13 Sep 2015 correct relic abundance from thermal freeze-out together with the constraints on the invisible branching fraction of the Higgs boson from the CERN Large Hadron Collider (LHC) [29,30]. The correct relic abundance can, however, be achieved in this model through thermal "freezein," in which the dark matter is produced slowly in the early universe through extremely weak interactions with the SM Higgs boson [13,19,31].…”

Section: +047mentioning

confidence: 99%

Implications of the observation of dark matter self-interactions for singlet scalar dark matter

et al. 2015

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Evidence for dark matter self-interactions has recently been reported based on the observation of a spatial offset between the dark matter halo and the stars in a galaxy in the cluster Abell 3827. Interpreting the offset as due to dark matter self-interactions leads to a cross section measurement of σDM/m ∼ (1−1.5) cm 2 g −1 , where m is the mass of the dark matter particle. We use this observation to constrain singlet scalar dark matter coupled to the Standard Model and to two-Higgs-doublet models. We show that the most natural scenario in this class of models is very light dark matter, below about 0.1 GeV, whose relic abundance is set by freeze-in, i.e., by slow production of dark matter in the early universe via extremely tiny interactions with the Higgs boson, never reaching thermal equilibrium. We also show that the dark matter abundance can be established through the usual thermal freeze-out mechanism in the singlet scalar extension of the Yukawa-aligned twoHiggs-doublet model, but that it requires rather severe fine tuning of the singlet scalar mass.

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Section: +047mentioning

confidence: 99%

Implications of the observation of dark matter self-interactions for singlet scalar dark matter

et al. 2015

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“…In the simplest version [73], the Higgs sector consists of the usual SM Higgs doublet Φ and a real singlet Higgs field χ. They couple to each other via a renormalizable interaction ρχ 2 Φ † Φ.…”

Section: E Models With Singlet Higgs Bosonsmentioning

confidence: 99%

Higgs precision (Higgcision) era begins

Cheung

Lee

Tseng

2013

J. High Energ. Phys.

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120

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After the discovery of the Higgs boson at the LHC, it is natural to start the research program on the precision study of the Higgs-boson couplings to various standard model (SM) particles. We provide a generic framework for the deviations of the couplings from their SM values by introducing a number of parameters. We show that a large number of models beyond the SM can be covered, including two-Higgs-doublet models, supersymmetric models, little-Higgs models, extended Higgs sectors with singlets, and fourth generation models. We perform global fits to the most updated data from CMS, ATLAS, and Tevatron under various initial conditions of the parameter set. In particular, we have made explicit comparisons between the fitting results before and after the Moriond 2013 meetings. Highlights of the results include: (i) the nonstandard decay branching ratio of the Higgs boson is less than 22%; (ii) the most efficient way to achieve the best fit for the data before the Moriond update is to introduce additional particle contributions to the triangularloop functions of Hγγ and Hgg vertices; (iii) the 1σ allowed range of the relative coupling of HV V is 1.01 +0.13 −0.14 , which means that the electroweak-symmetry breaking contribution from the observed Higgs boson leaves only a small room for other Higgs bosons; (iv) the current data do not rule out pseudoscalar couplings nor pseudoscalar contributions to the Hγγ and Hgg vertices; and (v) the SM Higgs boson provides the best fit to all the current Higgs data.

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“…While many possible new states can be added to prevent large corrections to the Higgs boson mass, the simplest choice consists in including just an inert scalar state [31][32][33][34][35][36][37][38], that is, a scalar particle only interacting with the Higgs boson (and gravity)-and therefore transforming as the singlet representation of the EW gauge group SU (2) × U (1) (and similarly not charged under the color group)-which acquires no vacuum expectation value. Such a choice minimizes unwanted effects on EW radiative corrections and other physics well described by the SM.…”

Section: Low-scale Seesaw and The Little Hierarchy Problemmentioning

confidence: 99%

Low-scale neutrino seesaw mechanism and scalar dark matter

Fabbrichesi

Petcov

2014

Eur. Phys. J. C

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We discuss how two birds-the little hierarchy problem of low-scale type-I seesaw models and the search for a viable dark matter candidate-are (proverbially) killed by one stone: a new inert scalar state. MotivationsTogether with the presence of dark matter (DM), neutrino oscillations-and the small neutrino mass entailed-are the only physics beyond the standard model (SM) experimentally confirmed.The most attractive model to account for the smallness of the neutrino masses is the seesaw mechanism [1][2][3][4]. This mechanism requires right-handed (RH) neutrinos whose masses can be taken at the GUT scale or, in low-scale scenarios, at lower energies if the Yukawa couplings are taken proportionally smaller, for instance, of the order of those of the charged leptons.The inclusion of these new states within the SM induces a finite renormalization that tends to pull the Higgs boson mass (or, equivalently, the electroweak (EW) scale) toward the higher scale. This is not a problem if the new states are themselves at the EW scale and the renormalization is itself of the order of the Higgs boson mass. If instead the new states are at a larger scale, they give rise to a hierarchy problem in which in order to keep the Higgs boson mass to its experimental value we have to cancel the renormalization to the higher scale to a degree that becomes increasingly fine-tuned as the new states are taken at higher mass scales.Such a cancelation can be achieved by a redefinition of the Higgs boson bare mass but it is more appealing and practical to use the hierarchy problem in a heuristic manner to help us in the definition of whatever model of physics we assume to exist beyond the SM [5]. a e-mail: marco@sissa.itThe problem of the large contribution to the Higgs mass m H coming from the new states is best understood in terms of the renormalization group equation (RGE)where the anomalous dimension is given, at one-loop order, byin dimensional regularization and where we only wrote the dominant contributions from the Higgs boson potential (λ), the top quark (λ t ) and the gauge couplings (g 1 and g 2 ). If new states are present at a higher scale, they must be introduced as a threshold effect in order to match the low-and highscale effective theories. That these threshold corrections are larger and larger as the new states are taken to be heavier and heavier is the hierarchy problem in the framework of an effective theory. According to the proposed approach, the new stateswhen they are taken together-must enter in such a way that their overall effect on the Higgs boson mass renormalization is no larger than the EW scale, thus making the bare mass renormalization natural. In other words, using the RGE terminology, the threshold corrections must be small and if the new states are very heavy they must enter in such a way as to cancel their respective contributions.The fine-tuning, if present, is all among the new states rather than between them and the SM contributions. In this approach it is possible to keep the physics at the two ...

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Global study of the simplest scalar phantom dark matter model

Cited by 82 publications

References 66 publications

Implications of the observation of dark matter self-interactions for singlet scalar dark matter

Implications of the observation of dark matter self-interactions for singlet scalar dark matter

Higgs precision (Higgcision) era begins

Low-scale neutrino seesaw mechanism and scalar dark matter

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