Dilaton portal in strongly interacting twin Higgs models

Ahmed, Aqeel; Najjari, Saereh

doi:10.1007/jhep02(2020)124

Cited by 10 publications

(10 citation statements)

References 76 publications

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“…As has been detailed for other pNGB realizations of neutral naturalness [36,[50][51][52][53][54], this scalar will have order one couplings to all the pNGBs, leading to observable signals at the LHC and future colliders. If the UV completion involves an approximate scale symmetry then a heavy scalar associated with the breaking of scale invariance, the dilaton, can have large coupling to the SM and hidden sector states [55] providing additional collider signals.…”

Section: Scalar Sectormentioning

confidence: 99%

A minimal model for neutral naturalness and pseudo-Nambu-Goldstone dark matter

Ahmed

Najjari

Verhaaren

2020

J. High Energ. Phys.

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We outline a scenario where both the Higgs and a complex scalar dark matter candidate arise as the pseudo-Nambu-Goldstone bosons of breaking a global SO(7) symmetry to SO(6). The novelty of our construction is that the symmetry partners of the Standard Model top-quark are charged under a hidden color group and not the usual SU(3) c. Consequently, the scale of spontaneous symmetry breaking and the masses of the top partners can be significantly lower than those with colored top partners. Taking these scales to be lower at once makes the model more natural and also reduces the induced nonderivative coupling between the Higgs and the dark matter. Indeed, natural realizations of this construction describe simple thermal WIMP dark matter which is stable under a global U(1) D symmetry. We show how the Large Hadron Collider along with current and next generation dark matter experiments will explore the most natural manifestations of this framework.

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Section: Scalar Sectormentioning

confidence: 99%

A minimal model for neutral naturalness and pseudo-Nambu-Goldstone dark matter

Ahmed

Najjari

Verhaaren

2020

J. High Energ. Phys.

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“…In addition, it is natural to envision the possibility that the dilaton provides a portal between the SM and a dark sector [4][5][6][7][8][9]. In this work, we assume a strongly coupled approximate scale invariant dark sector which contains a relatively light vector boson (dark photon) of a dark U(1) X gauge symmetry.…”

Section: Introductionmentioning

confidence: 99%

A light dilaton at the LHC

Ahmed

Mariotti

Najjari

2020

J. High Energ. Phys.

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137

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In this paper, we explore the possibility that a light dilaton can be the first sign of new physics at the LHC. The dilaton could emerge in approximate scale invariant UV completions of the SM as the Goldstone boson associated with the spontaneous breaking of the scale invariance. We study in detail the phenomenology of the dilaton at the LHC in the mass range of [10-300] GeV including the case where the dilaton can mix with the SM Higgs boson, leading to an interesting interplay between direct and indirect constraints. A possibility that the dilaton acts as a portal to a dark sector is also considered. As a minimal realization, the dark sector includes a dark photon lighter than the dilaton implying sizeable missing energy signatures. Several simplified benchmark models that can encode different UV completions are discussed, for which we scrutinize the current and future LHC reach.

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“…The spontaneous breaking of scale invariance results in a pseudo-Goldstone boson called, dilaton [8]. Requiring the scale invariance of the theory dictates the form of dilaton interactions with the SM and DM in the low-energy effective theory below scale Λ = 4πf [9][10][11][12][13]. It turns out that the dilaton interacts with the SM and DM through dimension-five or higher operators suppressed by the scale f .…”

Section: Introductionmentioning

confidence: 99%

Ultraviolet freeze-in dark matter through the dilaton portal

Ahmed¹,

Najjari²

2021

Preprint

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We consider a class of models where the Standard Model (SM) and dark matter (DM) belong to a conformal/scale-invariant theory at high energies. The scale invariance is broken spontaneously at scale f , and the corresponding Goldstone boson is the dilaton. In the low-energy theory, we assume DM interacts with the SM only through the dilaton portal suppressed by the conformal breaking scale f . Assuming f TeV, the portal interactions are very feeble, and hence the DM is not in thermal equilibrium with the SM bath. Therefore, ultraviolet freeze-in production of DM is realized through the dilaton portal, which is most effective at the maximum temperature of the SM bath. The temperature evolution critically depends on the reheating dynamics, which we parameterize by a general equation of state w and temperature at the end of reheating T rh . Implications of the reheating dynamics are studied for DM production in this framework. We have identified regions of parameter space that lead to the observed DM relic abundance for a wide range of DM masses and reheating temperatures for a scalar, vector, or fermion DM.

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Dilaton portal in strongly interacting twin Higgs models

Cited by 10 publications

References 76 publications

A minimal model for neutral naturalness and pseudo-Nambu-Goldstone dark matter

A minimal model for neutral naturalness and pseudo-Nambu-Goldstone dark matter

A light dilaton at the LHC

Ultraviolet freeze-in dark matter through the dilaton portal

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