Colorless top partners, a 125 GeV Higgs boson, and the limits on naturalness

Burdman, Gustavo; Chacko, Zackaria; Harnik, Roni; Lima, Leonardo de; Verhaaren, Christopher B.

doi:10.1103/physrevd.91.055007

Cited by 118 publications

(176 citation statements)

References 41 publications

(59 reference statements)

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“…They are related to the SM fermions and bosons by a discrete Z 2 symmetry which, together with the spontaneous breaking of a global symmetry that turns the Higgs into a pseudo Nambu-Goldstone boson (pNGB), guarantees that the Higgs mass be insensitive to the UV contributions. The resulting possibility of having a natural EWSB with the absence of detectable new physics at the LHC has sparked interest in this class of models in the last years, [6][7][8][9][10][11][12][13][14][15][16][17], but many questions still remain open. In particular, an important problem is to analyze the capability of this scenario to reproduce the observed value of M H , irrespective of any possible UV completion, supersymmetric or composite, of the low-energy Lagrangian.…”

Section: Jhep11(2016)108mentioning

confidence: 99%

The RG-improved Twin Higgs effective potential at NNLL

Greco¹,

Mimouni²

2016

J. High Energ. Phys.

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We present the Renormalization Group improvement of the Twin Higgs effective potential at cubic order in logarithmic accuracy. We first introduce a modelindependent low-energy effective Lagrangian that captures both the pseudo-Nambu-Goldstone boson nature of the Higgs field and the twin light degrees of freedom charged under a copy of the Standard Model. We then apply the background field method to systematically re-sum all the one loop diagrams contributing to the potential. We show how this technique can be efficient to implicitly renormalize the higher-dimensional operators in the twin sector without classifying all of them. A prediction for the Higgs mass in the Twin Higgs model is derived and found to be of the order of M H ∼ 120 GeV with an ultraviolet cut-off m * ∼ 10-20 TeV. Irrespective of any possible ultraviolet completion of the lowenergy Lagrangian, the infrared degrees of freedom alone are therefore enough to account for the observed value of the Higgs mass through running effects.

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Section: Jhep11(2016)108mentioning

confidence: 99%

The RG-improved Twin Higgs effective potential at NNLL

Greco¹,

Mimouni²

2016

J. High Energ. Phys.

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“…However, there are several exciting proposals for future colliders on the horizon. This includes 100 TeV machines like the SPPC [4] or FCChh [5], as well as lepton colliders that can make exquisite precision measurements [6,7]. Given the possibility of such a bright future for high energy experiments, it behooves us to ask: How can we test the basic hypothesis of naturalness, rather than a particular theory implementation?…”

Section: Introductionmentioning

confidence: 99%

Towards a no-lose theorem for naturalness

Curtin

Saraswat

2016

Phys. Rev. D

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We derive a phenomenological no-lose theorem for naturalness up to the TeV scale, which applies when quantum corrections to the Higgs mass from top quarks are canceled by perturbative BSM particles (top partners) of similar multiplicity due to to some symmetry. Null results from LHC searches already seem to disfavor such partners if they are colored. Any partners with SM charges and ∼ TeV masses will be exhaustively probed by the LHC and a future 100 TeV collider. Therefore, we focus on neutral top partners. While these arise in Twin Higgs theories, we analyze neutral top partners as model-independently as possible using EFT and Simplified Model methods. We classify all perturbative neutral top partner structures in order to compute their irreducible lowenergy signatures at proposed future lepton and hadron colliders, as well as the irreducible tunings suffered in each scenario. Central to our theorem is the assumption that SM-charged BSM states appear in the UV completion of neutral naturalness, which is the case in all known examples. Direct production at the 100 TeV collider then allows this scale to be probed at the ∼10 TeV level. We find that proposed future colliders probe any such scenario of naturalness with tuning of 10% or better. This provides very strong model-independent motivation for both new lepton and hadron colliders, which in tandem act as discovery machines for general naturalness. We put our results in context by discussing other possibilities for naturalness, including "swarms" of top partners, inherently non-perturbative or exotic physics, or theories without SM-charged states in the UV completion. Realizing a concrete scenario which avoids our arguments while still lacking experimental signatures remains an open model-building challenge.

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“…The cancellation of divergences in the Higgs potential is realized through a "Higgs Portal" coupling of the SM Higgs to the Twin Higgs. The LHC signals of the mirror symmetric twin framework include modified Higgs couplings as well as an invisible branching fraction [11].…”

Section: Introductionmentioning

confidence: 99%

Cosmology in Mirror Twin Higgs and neutrino masses

Chacko

Craig

Fox

et al. 2017

J. High Energ. Phys.

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113

169

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We explore a simple solution to the cosmological challenges of the original Mirror Twin Higgs (MTH) model that leads to interesting implications for experiment. We consider theories in which both the standard model and mirror neutrinos acquire masses through the familiar seesaw mechanism, but with a low right-handed neutrino mass scale of order a few GeV. In these νMTH models, the right-handed neutrinos leave the thermal bath while still relativistic. As the universe expands, these particles eventually become nonrelativistic, and come to dominate the energy density of the universe before decaying. Decays to standard model states are preferred, with the result that the visible sector is left at a higher temperature than the twin sector. Consequently the contribution of the twin sector to the radiation density in the early universe is suppressed, allowing the current bounds on this scenario to be satisfied. However, the energy density in twin radiation remains large enough to be discovered in future cosmic microwave background experiments. In addition, the twin neutrinos are significantly heavier than their standard model counterparts, resulting in a sizable contribution to the overall mass density in neutrinos that can be detected in upcoming experiments designed to probe the large scale structure of the universe.

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Colorless top partners, a 125 GeV Higgs boson, and the limits on naturalness

Cited by 118 publications

References 41 publications

The RG-improved Twin Higgs effective potential at NNLL

The RG-improved Twin Higgs effective potential at NNLL

Towards a no-lose theorem for naturalness

Cosmology in Mirror Twin Higgs and neutrino masses

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