Vacuum stability in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si1.gif" overflow="scroll"><mml:mi>U</mml:mi><mml:mo stretchy="false">(</mml:mo><mml:mn>1</mml:mn><mml:mo stretchy="false">)</mml:mo></mml:math>-prime extensions of the Standard Model with TeV scale right handed neutrinos

Corianò, Claudio; Rose, Luigi Delle; Marzo, C. De

doi:10.1016/j.physletb.2014.09.001

Cited by 43 publications

(48 citation statements)

References 22 publications

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“…In essence, with extended scalar, gauge and flavour sectors, it is natural to ask whether the vacuum of the this class of models is in a stable configuration both at the classical and at the quantum level and what is the impact of the new physics on the SM EW ground state [20,21,[31][32][33][34][35][36][37][38][39]. Indeed, the extrapolation of the SM to high energy scales, through the RG equations, exhibits a scalar potential with a non-trivial structure: its minimum does not correspond to the EW vacuum which is found to be in a metastable configuration, very close to a phase transition [40,41].…”

Section: Jhep07(2016)086mentioning

confidence: 99%

Z ′, Higgses and heavy neutrinos in U(1)′ models: from the LHC to the GUT scale

Accomando

Corianò

Rose

et al. 2016

J. High Energ. Phys.

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We study a class of non-exotic minimal U(1) extensions of the Standard Model, which includes all scenarios that are anomaly-free with the ordinary fermion content augmented by one Right-Handed neutrino per generation, wherein the new Abelian gauge group is spontaneously broken by the non-zero Vacuum Expectation Value of an additional Higgs singlet field, in turn providing mass to a Z state. By adopting the B − L example, whose results can be recast into those pertaining to the whole aforementioned class, and allowing for both scalar and gauge mixing, we first extract the surviving parameter space in presence of up-to-date theoretical and experimental constraints. Over the corresponding parameter configurations, we then delineate the high energy behaviour of such constructs in terms of their stability and perturbativity. Finally, we highlight key production and decay channels of the new states entering the spectra of this class of models, i.e., heavy neutrinos, a second Higgs state and the Z , which are amenable to experimental investigation at the Large Hadron Collider. We therefore set the stage to establish a direct link between measurements obtainable at the Electro-Weak scale and the dynamics of the underlying model up to those where a Grand Unification Theory embedding a U(1) can be realised.

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Section: Jhep07(2016)086mentioning

confidence: 99%

Z ′, Higgses and heavy neutrinos in U(1)′ models: from the LHC to the GUT scale

Accomando

Corianò

Rose

et al. 2016

J. High Energ. Phys.

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“…The simplest possibility is to introduce a real [6,7] or complex [8] scalar which couples to the Higgs and makes the scalar potential convex. In this work, we consider the next simplest option: introducing an extra U(1) symmetry [9][10][11]. The presence of an extra U(1) gauge boson generally has a stabilizing effect on the potential due the positive contribution to the beta-function of the Higgs quartic coupling.…”

Section: Introductionmentioning

confidence: 99%

Stabilizing the Higgs potential with a Z′

2015

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Editor: A. Ringwald Current data point toward metastability of the electroweak vacuum within the Standard Model. We study the possibility of stabilizing the Higgs potential in U(1) extensions thereof. A generic Z boson improves stability of the scalar potential in two ways: it increases the Higgs self-coupling, due to a positive contribution to the beta-function of the latter, and it decreases the top quark Yukawa coupling, which again has a stabilizing effect. We determine the range of U(1) charges which leads to a stable electroweak vacuum. In certain classes of models, such stabilization is possible even if the Z does not couple to the Higgs and is due entirely to the reduction of the top Yukawa coupling. We also study the effect of the kinetic mixing between the extra U(1) and hypercharge gauge fields.

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“…Since the stability condition of the electroweak vacuum is strongly sensitive to new physics, from the phenomenological point of view it is clear that beyond SM physics models have to pass a sort of "stability test" [21][22][23]. Indeed, only new physics models that reinforce the requirement of a stable or metastable (but with τ > T U ) electroweak vacuum can be accepted as a viable UV completion of the SM [24][25][26][27][28][29][30][31][32][33][34][35].…”

Section: Introductionmentioning

confidence: 99%

Majorana dark matter through the Higgs portal under the vacuum stability lamppost

et al. 2015

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We study the vacuum stability of a minimal Higgs portal model in which the standard model (SM) particle spectrum is extended to include one complex scalar field and one Dirac fermion. These new fields are singlets under the SM gauge group and are charged under a global U (1) symmetry. Breaking of this U (1) symmetry results in a massless Goldstone boson, a massive CPeven scalar, and splits the Dirac fermion into two new mass-eigenstates, corresponding to Majorana fermions. The lightest Majorana fermion (w) is absolutely stable, providing a plausible dark matter (DM) candidate. We show that interactions between the Higgs sector and the lightest Majorana fermion which are strong enough to yield a thermal relic abundance consistent with observation can easily destabilize the electroweak vacuum or drive the theory into a non-perturbative regime at an energy scale well below the Planck mass. However, we also demonstrate that there is a region of the parameter space which develops a stable vacuum (up to the Planck scale), satisfies the relic abundance, and is in agreement with direct DM searches. Such an interesting region of the parameter space corresponds to DM masses 350 GeV mw 1 TeV. The region of interest is within reach of second generation DM direct detection experiments.

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Vacuum stability inU(1)-prime extensions of the Standard Model with TeV scale right handed neutrinos

Cited by 43 publications

References 22 publications

Z ′, Higgses and heavy neutrinos in U(1)′ models: from the LHC to the GUT scale

Z ′, Higgses and heavy neutrinos in U(1)′ models: from the LHC to the GUT scale

Stabilizing the Higgs potential with a Z′

Majorana dark matter through the Higgs portal under the vacuum stability lamppost

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