Minimal<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>B</mml:mi><mml:mo>−</mml:mo><mml:mi>L</mml:mi></mml:math>model naturally realized at the TeV scale

Iso, Satoshi; Okada, Nobuchika; Orikasa, Yuta

doi:10.1103/physrevd.80.115007

Cited by 185 publications

(158 citation statements)

References 50 publications

(27 reference statements)

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“…It has been pointed out in [3,4] if we impose the classically conformal symmetry on the minimal B − L model, the B − L symmetry breaking is naturally realized at the TeV scale. Thus, the mass scale of all new particles are at the TeV scale or smaller.…”

Section: The Classically Conformalmentioning

confidence: 99%

“…Recently, the minimal B − L model with the classically conformal invariance has been proposed [3] and it has been shown [4] that the B − L symmetry breaking in the model is naturally realized at the TeV scale when the B − L gauge coupling constant is of the same order of the SM gauge coupling constants. Furthermore, one of cosmological aspects of the minimal B − L model at the TeV scale, baryogenesis via leptogenesis, has been investigated with detailed numerical analysis.…”

Section: Introductionmentioning

confidence: 99%

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Dark matter in the classically conformalB−Lmodel

Okada

Orikasa

2012

Phys. Rev. D

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When the classically conformal invariance is imposed on the minimal gauged B − L extended Standard Model (SM), the B − L gauge symmetry is broken by the Coleman-Weinberg mechanism naturally at the TeV scale. Introducing a new Z 2 parity in the model, we investigate phenomenology of a right-handed neutrino dark matter whose stability is ensured by the parity. We find that the relic abundance of the dark matter particle can be consistent with the observations through annihilation processes enhanced by resonances of either the SM Higgs boson, the B − L Higgs boson or the B − L gauge boson (Z' boson). Therefore, the dark matter mass is close to half of one of these boson masses. Due to the classically conformal invariance and the B − L gauge symmetry breaking via the Coleman-Weinberg mechanism, Higgs boson masses, Z' boson mass and the dark matter mass are all related, and we identify the mass region to be consistent with experimental results. We also calculate the spin-independent cross section of the dark matter particle off with nucleon and discuss implications for future direct dark matter search experiments.

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Section: The Classically Conformalmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Dark matter in the classically conformalB−Lmodel

Okada

Orikasa

2012

Phys. Rev. D

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“…The values of M t are given to show the amount of tuning and should not be taken literally. 2 There are several arguments that this tuning is required by a principle such as the multiple point principle [18,19,20], the maximum entropy principle [21,22], the classical conformality [23,24,25,26,27,28,29,30,31], and the asymptotic safety [32].…”

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confidence: 99%

Higgs Inflation is Still Alive after the Results from BICEP2

et al. 2014

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The observed value of the Higgs mass indicates that the Higgs potential becomes small and flat at the scale around 10 17 GeV. Having this fact in mind, we reconsider the Higgs inflation scenario proposed by Bezrukov and Shaposhnikov. It turns out that the non-minimal coupling ξ of the Higgs-squared to the Ricci scalar can be smaller than ten. For example, ξ = 7 corresponds to the tensor-to-scalar ratio r 0.2, which is consistent with the recent observation by BICEP2. *

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“…Choosing λ mix < 0, the electroweak symmetry is broken in the same way as in the SM [25,26]. However, we should note that a crucial difference from the SM is that, in our model, the electroweak symmetry …”

Section: Electroweak Symmetry Breakingmentioning

confidence: 99%

“…where the logarithmic divergence and the terms independent of φ are all encoded in C. Here, the major contributions to quantum corrections are from the Z ′ boson loops: 14) where the first term is from the one-loop diagram, and the second one is from the two-loop diagram [25,26] involving the Z ′ boson and the top quark. By adding a counter-term, we renormalize the coupling λ mix with the renormalization condition, 15) where λ mix is the renormalized coupling.…”

Section: Naturalness Bounds From Sm Higgs Mass Correctionsmentioning

confidence: 99%

Right-handed neutrino dark matter in the classically conformal U(1)′ extended standard model

2017

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We consider the dark matter (DM) scenario in the context of the classically conformal U(1) ′ extended standard model (SM), with three right-handed neutrinos (RHNs) and the U(1) ′ Higgs field. The model is free from all the U(1) ′ gauge and gravitational anomalies in the presence of the three RHNs. We introduce a Z 2 -parity in the model, under which an odd-parity is assigned to one RHN, while all the other particles is assigned to be Z 2 -even, and hence the Z 2 -odd RHN serves as a DM candidate. In this model, the U(1) ′ gauge symmetry is radiatively broken through the Coleman-Weinberg mechanism, by which the electroweak symmetry breaking is triggered. There are three free parameters in our model, the U(1) ′ charge of the SM Higgs doublet (x H ), the new U(1) ′ gauge coupling (g X ), and the U(1) ′ gauge boson (Z ′ ) mass (m Z ′ ), which are severely constrained in order to solve the electroweak vacuum instability problem, and satisfy the LHC Run-2 bounds from the search for Z ′ boson resonance. In addition to these constraints, we investigate the RHN DM physics. Because of the nature of classical conformality, we find that a RHN DM pair mainly annihilates into the SM particles through the Z ′ boson exchange. This is the socalled Z ′ -portal DM scenario. Combining the electroweak vacuum stability condition, the LHC Run-2 bounds, and the cosmological constraint from the observed DM relic density, we find that all constrains complementarily work to narrow down the allowed parameter regions, and, especially, exclude m Z ′ 3.5 TeV. For the obtained allowed regions, we calculate the spin-independent cross section of the RHN DM with nucleons. We find that the resultant cross section well below the current experimental upper bounds.

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MinimalB−Lmodel naturally realized at the TeV scale

Cited by 185 publications

References 50 publications

Dark matter in the classically conformalB−Lmodel

Dark matter in the classically conformalB−Lmodel

Higgs Inflation is Still Alive after the Results from BICEP2

Right-handed neutrino dark matter in the classically conformal U(1)′ extended standard model

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