Breaking mirror twin hypercharge

Batell, Brian; Verhaaren, Christopher B.

doi:10.1007/jhep12(2019)010

Cited by 23 publications

(25 citation statements)

References 81 publications

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“…Despite the additional difficulty involved in predicting the abundance for larger twin photon masses, it would be interesting to explore this part of parameter space. In particular, it would be interesting to consider concrete scenarios with twin photons in the range of tens of GeV [61].…”

Section: Freezing-twin Dark Mattermentioning

confidence: 99%

Freezing-in twin dark matter

Koren

McGehee

2020

Phys. Rev. D

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The mirror twin Higgs (MTH) addresses the little hierarchy problem by relating every Standard Model (SM) particle to a twin copy, but is in tension with cosmological bounds on light degrees of freedom. Asymmetric reheating has recently been proposed as a simple way to fix MTH cosmology by diluting the twin energy density. We show that this dilution sets the stage for an interesting freeze-in scenario where both the initial absence of dark sector energy and the feeble coupling to the SM are motivated for reasons unrelated to dark matter production. We give the twin photon a Stueckelberg mass and freeze-in twin electron and positron dark matter through the kinetic mixing portal. The kinetic mixing required to obtain the dark matter abundance is of the loop-suppressed order expected from infrared contributions in the MTH.

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Section: Freezing-twin Dark Mattermentioning

confidence: 99%

Freezing-in twin dark matter

Koren

McGehee

2020

Phys. Rev. D

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“…However, given the lack of Z 2 symmetry, the proximity of the top Yukawa, SU(2) gauge, and SU(3) gauge couplings in the SM and twin sectors should be addressed. One could also make the twin neutrinos heavy [35,36] and even the twin photon heavy without affecting naturalness [37,38], while expanding the possibilities for twin dark matter candidates [39,40]. Asymmetric entropy production after the twin and SM sectors decouple is another way to diminish N eff [30,36,[41][42][43].…”

Section: Jhep05(2020)155mentioning

confidence: 99%

A predictive mirror twin Higgs with small Z2 breaking

Harigaya

McGehee

Murayama

et al. 2020

J. High Energ. Phys.

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The twin Higgs mechanism is a solution to the little hierarchy problem in which the top partner is neutral under the Standard Model (SM) gauge group. The simplest mirror twin Higgs (MTH) model-where a Z 2 symmetry copies each SM particle-has too many relativistic degrees of freedom to be consistent with cosmological observations. We demonstrate that MTH models can have an observationally viable cosmology if the twin mass spectrum leads to twin neutrino decoupling before the SM and twin QCD phase transitions. Our solution requires the twin photon to have a mass of ∼ 20 MeV and kinetically mix with the SM photon to mediate entropy transfer from the twin sector to the SM. This twin photon can be robustly discovered or excluded by future experiments. Additionally, the residual twin degrees of freedom present in the early Universe in this scenario would be detectable by future observations of the cosmic microwave background.

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“…1 This approach was advocated recently in refs. [56,57], which explored the simultaneous spontaneous breakdown of mirror hypercharge gauge symmetry and Z 2 symmetry. In this work we examine the spontaneous breakdown of the twin color symmetry.…”

Section: Introductionmentioning

confidence: 99%

Breaking mirror twin color

Batell

Verhaaren

2020

J. High Energ. Phys.

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We investigate simple extensions of the Mirror Twin Higgs model in which the twin color gauge symmetry and the discrete Z 2 mirror symmetry are spontaneously broken. This is accomplished in a minimal way by introducing a single new colored triplet, sextet, or octet scalar field and its twin along with a suitable scalar potential. This spontaneous Z 2 breaking allows for a phenomenologically viable alignment of the electroweak vacuum, and leads to dramatic differences between the visible and mirror sectors with regard to the residual gauge symmetries at low energies, color confinement scales, and particle spectra. In particular, several of our models feature a remnant SU(2) or SO(3) twin color gauge symmetry with a very low confinement scale in comparison to Λ QCD. Furthermore, couplings between the colored scalar and matter provide a new dynamical source of twin fermion masses, and due to the mirror symmetry, these lead to a variety of correlated visible sector effects that can be probed through precision measurements and collider searches.

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Breaking mirror twin hypercharge

Cited by 23 publications

References 81 publications

Freezing-in twin dark matter

Freezing-in twin dark matter

A predictive mirror twin Higgs with small Z2 breaking

Breaking mirror twin color

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