Two-loop radiative seesaw model with inert triplet scalar field

If neutrinos are Dirac fermions, certain new physics beyond the standard model should exist to account for the smallness of neutrino mass. With two additional scalars and a heavy intermediate fermion, in this paper, we systematically study the general mechanism that can naturally generate the tiny Dirac neutrino mass at tree and in one-loop level. For tree level models, we focus on natural ones, in which the additional scalars develop small vacuum expectation values without fine-tuning. For one-loop level models, we explore those having dark matter candidates under Z D 2 symmetry. In both cases, we concentrate on SU(2) L multiplet scalars no larger than quintuplet, and derive the complete sets of viable models. Phenomenologies, such as lepton flavor violation, leptogenesis, DM and LHC signatures are briefly discussed.

“…R and ∆ 0 I exists due to the mixing between η and ∆ [107]. Specifically speaking, the quartic term κ(η † H) 2 will induce the mass splitting between η 0 R and η 0 I .…”

Section: Jhep04(2017)166mentioning

confidence: 99%

Naturally small Dirac neutrino mass with intermediate SU(2) L multiplet fields

Wang

Han

2017

“…5 We mention that there are also papers on two-loop models in the literature, which are not covered by our classification, because they are of higher dimension than the Weinberg operator. To quote two more examples, the papers [73][74][75][76] have several variants of CLBZ at d = 7, while [77] has a variant of the RB at d = 7. Finally there is the paper [78], that discusses Dirac neutrino masses at 2-loop.…”

Section: Jhep03(2015)040mentioning

confidence: 99%

“…Such a construction would allow to understand, at least in principle, why that particular coupling is small compared to all others, simply due to the 1/(16π 2 ) suppression from the loop. An example of this approach is the d = 7 RB model of [77], but the very same idea could, of course, be applied to any of our non-genuine d = 5 diagrams.…”

Section: Non-genuine But Finite 2-loop Modelsmentioning

confidence: 99%

See 1 more Smart Citation

Systematic classification of two-loop realizations of the Weinberg operator

Sierra

Degée

Dorame

et al. 2015

We systematically analyze the d = 5 Weinberg operator at 2-loop order. Using a diagrammatic approach, we identify two different interesting categories of neutrino mass models: (i) Genuine 2-loop models for which both, tree-level and 1-loop contributions, are guaranteed to be absent. And (ii) finite 2-loop diagrams, which correspond to the 1-loop generation of some particular vertex appearing in a given 1-loop neutrino mass model, thus being effectively 2-loop. From the large list of all possible 2-loop diagrams, the vast majority are infinite corrections to lower order neutrino mass models and only a moderately small number of diagrams fall into these two interesting classes. Moreover, all diagrams in class (i) are just variations of three basic diagrams, with examples discussed in the literature before. Similarly, we also show that class (ii) diagrams consists of only variations of these three plus two more basic diagrams. Finally, we show how our results can be consistently and readily used in order to construct two-loop neutrino mass models.

“…The recent Higgs data has been discussed in the SUSY models , little Higgs models [28][29][30][31][32][33][34] and the extensions of Higgs field models, such as the two-Higgs-doublet model [35][36][37][38][39][40][41][42][43][44][45][46][47][48], the Higgs triplet model (Y=2) [49][50][51][52][53][54][55][56][57], the models with septuplet [58] and color-octet scalar [59]. In this work, we will study the implications of the LHC diphoton and Z+photon Higgs signals on the Higgs triplet model with Y=0 (HTM0) [60,61], which predicts two neutral CP-even Higgs bosons h, H and a pair of charged Higgs H ± .…”

Section: Introductionmentioning

confidence: 99%

LHC diphoton and Z+photon Higgs signals in the Higgs triplet model with Y = 0

Wang

Han

2014

Abstract:We study the implications of the LHC diphoton and Z+photon Higgs signals on the Higgs triplet model with Y=0, which predicts two neutral CP-even Higgs bosons h, H and a pair of charged Higgs H ± . We discuss three different scenarios: (i) the observed boson is the light Higgs boson h; (ii) it is the heavy Higgs boson H; (iii) the observed signal is from the almost degenerate h and H. We find that the inclusive Higgs diphoton rates in the first two scenarios can be enhanced or suppressed compared to the SM value, which can respectively fit the ATLAS and CMS diphoton data within 1σ range. The inclusive ZZ * rates are suppressed, which are outside 1σ range of ATLAS data and within 1σ range of CMS data. Meanwhile, another CP-even Higgs boson production rate can be suppressed enough not to be observed at the collider. For the third scenario, the Higgs diphoton rate is suppressed, which is outside 1σ range of ATLAS data, and the ZZ * rate equals to SM value approximately. In addition, we find that the two rates of h → γγ and h → Zγ have the positive correlations for the three scenarios.