Model Of Electroweak-scale Right-handed Neutrinos Research Articles

Schwinger-Dyson equations for fermions self-energy in the electroweak-scale right-handed neutrino model

Schwinger-Dyson equations for fermions self-energy in the electroweak-scale right-handed neutrino model

Dynamical electroweak symmetry breaking in the model of electroweak-scale right-handed neutrinos

We present the Higgs mechanism in the context of the EW-scale [Formula: see text] model in which electroweak symmetry is dynamically broken by condensates of mirror quark and right-handed neutrino through the exchange of one fundamental Higgs doublet and one fundamental Higgs triplet, respectively. The formation of these condensates is dynamically investigated by using the Schwinger–Dyson approach. The occurrence of these condensates will give rise to the rich Higgs spectrum. In addition, the VEVs of Higgs fields is also discussed in this dynamical phenomenon.

On neutrino and charged lepton masses and mixings: a view from the electroweak-scale right-handed neutrino model

We present a model of neutrino masses within the framework of the EW-ν R model in which the experimentally desired form of the PMNS matrix is obtained by applying an A 4 symmetry to the Higgs singlet sector responsible for the neutrino Dirac mass matrix. This mechanism naturally avoids potential conflict with the LHC data which severely constrains the Higgs sector, in particular the Higgs doublets. Moreover, by making a simple ansätz we extract $$ {\mathrm{\mathcal{M}}}_{\mathrm{l}}{{\mathrm{\mathcal{M}}}_{\mathrm{l}}}^{\dagger } $$ for the charged lepton sector. A similar ansätz is proposed for the quark sector. The sources of masses for the neutrinos are entirely different from those for the charged leptons and for the quarks and this might explain why U PMNS is very different from V CKM .

Erratum to: On neutrino and charged lepton masses and mixings: a view from the electroweak-scale right-handed neutrino model

We present a model of neutrino masses within the framework of the EW-$\nu_R$ model in which the experimentally desired form of the PMNS matrix is obtained by applying an $A_4$ symmetry to the \emph{Higgs singlet sector} responsible for the neutrino Dirac mass matrix. This mechanism naturally avoids potential conflict with the LHC data which severely constrains the Higgs sector, in particular the Higgs doublets. Moreover, by making a simple $ans\ddot{a}tz$ we extract $\mathcal{M}_l {\mathcal{M}_l}^\dagger$ for the charged lepton sector. A similar $ans\ddot{a}tz$ is proposed for the quark sector. The sources of masses for the neutrinos are entirely different from those for the charged leptons and for the quarks and this might explain why $U_{PMNS}$ is {\em very different} from $V_{CKM}$.

Non-sterile electroweak-scale right-handed neutrinos and the dual nature of the 125-GeV scalar

Can, and under which conditions, the 125-GeV SM-like scalar with the signal strengths for its decays into W+W−, ZZ, γγ, bb¯ and ττ¯ being consistent with experiments be accommodated in models that go beyond the Standard Model? Is it truly what it appears to be, namely the SM Higgs boson, or could it be quite different? A minimal extension of the original electroweak-scale right-handed neutrino model, in which right-handed neutrinos naturally obtain electroweak-scale masses, shows a scalar spectrum which includes either the 125-GeV SM-like scalar or a scalar which is quite unlike that of the Standard Model, both of which possess signal strengths compatible with experiment. In other words, the 125-GeV scalar could be an impostor.

One-Loop β Functions for Yukawa Couplings in the Electroweak-Scale Right-Handed Neutrino Model

Fermions in the model of electroweak-scale right-handed neutrinos (EWRH) with masses of the order of 300 GeV or more could result in dynamical electroweak symmetry breaking by forming condensates through the exchange of a fundamental Higgs scalar doublet or triplet. These condensates are dynamically studied within the framework of the Schwinger- Dyson equation. With the electroweak symmetry broken by condensates, the fully worked-out model of EWRH in which there are two doublets and two triplets, one of which is composite and the others being the original fundamental scalar doublet and triplet could be suitable for recent LHC discovery of the 125 GeV scalar particle.

CALCULATION OF THE ANOMALOUS MAGNETIC MOMENT OF μ IN A MODEL OF ELECTROWEAK-SCALE RIGHT-HANDED NEUTRINOS

The lepton flavor violating process μ → eγ has been previously studied in a model of electroweak-scale right-handed neutrinos. We had calculated the decay amplitude in unitarity gauge [J. P. Bu, Y. Liao and J. Y. Liu, Phys. Lett. B665, 39 (2008)] and Rξ gauge [J. P. Bu, Commun. Theor. Phys.53, 703 (2010)]. In this paper, we calculate the anomalous magnetic moment of μ in Rξ gauge.

Calculation of Decay μ → eγ in Small Neutrino Mass Limit in a Model of Right-Handed Neutrinos

The lepton flavor violating process has been previously studied in a model of electroweak-scale right-handed neutrinos. We have calculated the decay amplitude in unitarity gauge [1]. In this paper, we recalculate the amplitude in gauge but in small neutrino mass limit. The final result which the cancellation of the dependence in is different from the obtained amplitude and the technical points in the previous work.

Calculation of Decay μ → eγ in Rξ Gauge in a Model of Electroweak-Scale Right-Handed Neutrinos

The lepton flavor violating process μ → eγ has been previously studied in a model of electroweak-scale right-handed neutrinos. In that work the decay amplitude was computed in unitarity gauge, augmented by some technical considerations that correct the leading term thus obtained. This complication arises because the mixing matrices appearing in the weak charged currents are not unitary in the model. In this paper, we recalculate the amplitude in Rξ gauge. The cancellation of the ξ dependence in the final result serves as a useful check to both the obtained amplitude and the technical points made in the previous work.

Electroweak-scale mirror fermions, [formula omitted] and [formula omitted

The Lepton Flavor Violating (LFV) processes μ→eγ and τ→μγ are estimated in a model of electroweak-scale right-handed neutrinos. The present bounds on the branching ratios, B(μ→eγ)<1.2×10−11, B(τ→μγ)<6.8×10−8 (BaBar) and <4.5×10−8 (Belle), put strong constraints on the parameters of the model. This constraint links low energy rare decay processes to high-energy phenomena (e.g., decay lengths of the mirror charged leptons which are important in the search for the telltale like-sign dilepton events present in the model of electroweak-scale right-handed neutrinos). The model can be tested at future colliders (LHC, ILC) and at MEG and/or B factories.