Spin light mode of massive neutrino radiative decay in matter
Alexander Grigoriev, Alexey Lokhov, Alexander Studenikin
利用有物质存在下Dirac中微子波函数的精确解，研究了中微子从初始重态到最终轻态跃迁过程中的自旋光模。自旋光的发射是由于中微子的非零跃迁磁矩。
Using the exact solutions for the Dirac neutrino wave function in presence of matter we study the spin light mode in the process of neutrino transition from initial heavier to final lighter state. The spin light is emitted due to the neutrino nonzero transitional magnetic moment.
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Can LSND and SuperKamiokande be explained by radiative decays of muons-neutrinos?
物质中μ子中微子的辐射衰变与质量简并中微子的方案可能是LSND反电子中微子出现和SuperKamiokande μ子中微子消失的共同起源。利用LSND信号固定衰变几率，可以满意地再现大气中微子的亏损。
We discuss the linkage between dark matter mass in the one-loop radiative seesaw model and the effective neutrino mass for the neutrino less double beta decay. This linkage, which has been already numerically suggested, is confirmed to be a reasonable relationship by deriving analytical expressions for two zero flavor neutrino mass texture.
Some Radiative Corrections to Neutrino Scattering: I Neutral Currents
随着高精度中微子散射实验的出现，需要改进辐射校正。我们提出了一个唯象分析的中微子中性流散射的光子的生产相关的实验归入1%的水平的一些贡献。
We consider the radiative generation of neutrino mass through the interactions of neutrinos with MeV dark matter. We construct a realistic renormalizable model with one scalar doublet and one complex singlet together with three light singlet Majorana fermions, all transforming under a dark U(1) symmetry which breaks softly to Z_2. We study in detail the scalar sector which supports this specific scenario and its rich phenomenology.
The Weinberg operator allows for the construction of radiative Majorana neutrino masses. In this letter, it will be shown that it is possible to construct a one-loop diagram that will be the principal component of the neutrino mass matrix and that will have an exact mixing matrix with $θ_{13} =0$. The addition of a two-loop diagram, which is naturally suppressed, allows the creation of the correct perturbations that will give a neutrino mixing matrix with entries inside experimental constrains, including the possibility of large CP Dirac phases.
Supersymmetric Model of Radiative Seesaw Majorana Neutrino Masses
最近提出的辐射跷跷板机制是最低限度地扩展到包括超对称性在一个特定的模型。讨论了薄生和暗物质等相关问题。
Fermion Triplet Dark Matter and Radiative Neutrino Mass
马约拉纳费米子三重态（Sigma^+，Sigma ^0，Sigma ^-）的中性成员被认为是宇宙中暗物质的候选者。它也可以作为获得辐射中微子质量的跷跷板锚。
Can radiative correction cause large neutrino mixing?
我们研究了辐射修正是否能解释具有相同CP宇称的一对简并中微子大混合的产生。我们发现，这种机制是微调，并不适用于任意混合在高尺度。
Radiatively Induced Neutrino Masses and Large Higgs-Neutrino Couplings in the Standard Model with Majorana Fields
本文系统地分析了标准模型的Higgs扇区，每个标准模型中只有一个右手中微子。在一个模型与代际之间的独立混合的家庭，我们可以考虑非常轻的中微子获得马约拉纳质量辐射在第一电弱回路水平。我们还发现，在这样的情况下，希格斯耦合到轻-重中微子和重-重的可能会显着增强与这些重中微子在高能对撞机的生产显着的影响。
We propose a simple radiative neutrino mass scenario with a Dirac dark matter candidate, which is minimally realized by a Z3 symmetry. We introduce two Dirac neutrinos and two inert doublets. We demonstrate that the model has a large allowed region that satisfies the constraints from neutrino oscillation data, lepton flavor violations, direct/indirect detection of dark matter and dark matter relic density. We also propose an efficient parameterization of the neutrino Yukawa couplings, which reproduces a desired active neutrino mass matrix.
Minimal $SU(5)$ Grand Unified models predict massless neutrinos and struggle to achieve gauge coupling unification compatible with the observed lower limit on the proton lifetime. Both of these issues can be resolved by embedding minimal radiative neutrino mass models into $SU(5)$. We systematically analyze the possible ways to realize radiative neutrino mass generation in $SU(5)$ and provide a list of the minimal models. We find various models that have not been considered in the literature and demonstrate the compatibility of radiative neutrino masses with gauge coupling unification and prot…
Lepton Flavor Violation and Radiative Neutrino Masses
轻子味破缺在理论的各个部分都能通过波函数重整化对中微子质量和混合产生重要影响。我们研究了从简并质量模式产生大气和太阳中微子质量分裂的辐射修正味结构的一般条件。得到的混合角关系与实验结果一致。
Minimal Radiative Neutrino Mass Mechanism for Inverse Seesaw Models
研究了在标准模型的反跷跷板扩展中产生小Majorana中微子质量的最小单圈辐射机制，其中每个家庭有两个单重态费米子。这种辐射机制的新特点是单圈诱导左手中微子的质量矩阵与右手中微子的马约拉纳质量矩阵成正比。这是一个非常经济的方案，不需要非标准标量场或规范场的存在。
Radiative magnification of neutrino mixings and a natural explanation of the neutrino anomalies
我们表明，中微子混合模式与大气中微子问题所需的大混合和太阳中微子问题的小混合角MSW解决方案，可以自然地产生通过辐射放大，即使所有的混合角在跷跷板规模可能很小。这可以解释中微子异常以及夸克-轻子统一理论背景下的CHOOZ约束，其中夸克和轻子混合角在高尺度下预计是相似的。我们还指出了4个$ν$混合的情况下，这种机制的辐射放大可以提供一个自然的解释。
Radiative Neutrino Mass, Dark Matter and Leptogenesis
我们提出了一个扩展的标准模型，其中中微子是狄拉克粒子和他们的微小质量来源于一个单圈辐射图。中微子质量产生所需的新场也可以解释宇宙中的物质-反物质不对称性和暗物质。
Radiative stability of neutrino-mass textures
在高尺度下提出的中微子质量纹理是不稳定的，特别是对近简并的本征值的辐射校正。在重整化群的约束条件下，我们发现了一类规范理论中的机制，它保证了在低能量下具有辐射稳定性的任何高尺度纹理的再现。我们还展示了如何解释太阳和大气中微子异常的机制，通过在高尺度的双峰纹理。
Future long-baseline neutrino experiments will measure neutrino oscillation properties with unprecedented precision and will search for clear signatures of CP violation in the leptonic sector. Near detectors can measure the neutrino-electron scattering with high statistics, giving the chance for its precise measurement. We study, in this work, the expectations for the measurement of radiative corrections in this process. We focus on the determination of contributions that are exclusive to the neutrino channels, particularly on the neutrino charge radius. We illustrate how the perspectives in a…
We consider the conventional left-right gauge extension of the standard model of quarks and leptons without a scalar bidoublet. We study systematically how one-loop radiative Dirac neutrino masses may be obtained. In addition to two well-known cases from almost 30 years ago, we find two new scenarios with verifiable predictions.
The radiative neutrino mass model can relate neutrino masses and dark matter at a TeV scale. If we apply this model to thermal leptogenesis, we need to consider resonant leptogenesis at that scale. It requires both finely degenerate masses for the right-handed neutrinos and a tiny neutrino Yukawa coupling. We propose an extension of the model with a U(1) gauge symmetry, in which these conditions are shown to be simultaneously realized through a TeV scale symmetry breaking. Moreover, this extension can bring about a small quartic scalar coupling between the Higgs doublet scalar and an inert dou…
Probing Radiative Solar Neutrinos Decays
受F.Vannucci等人在日食期间进行的先导实验的启发，我们计算出了太阳中微子辐射衰变的几何结构。令人惊讶的是，虽然可以检测到较小比例的光子，但强非简并中微子的情况在基本耦合方面带来了更好的限制。我们提倡基于卫星的实验，以提高灵敏度。
Radiative Corrections in the Presence of Majorana Neutrinos
在跷跷板机制下研究了第四代轻子的辐射修正。我们在单圈水平上对过程（${\rm e}^{+}{\rm e}^{-}\! \rightarrow {\rm W}^{+}{\rm W}^{-}$）的微分截面进行了数值估计，并在截面中发现了Majorana中微子产生的阈值行为.
Radiative neutrino decay in hot media
考虑到热浴中光子的受激发射效应，我们计算了在电子和光子的热背景中辐射中微子衰变的速率。我们表明，该速率是提高了一个大的因素，相对于相应的过程中的真空中的速率。
Neutrino radiative decay and lepton flavor violation in supersymme tric models
中微子的辐射衰变，如（\bar{ν_τ}：\longrightarrow：ν_μ+γ）、含右手中微子的最小超对称标准模型（MSSMRN）和含右手中微子的（SU（5））大统一理论（（SU（5）RN））模型中的情况进行了研究，在这些模型中，中微子的跃迁磁矩与中微子的质量成正比对于大气中微子问题的大混合角解，跃迁磁矩可以比标准模型（加上右手中微子单线态）的值大几倍，或与之相当。
Radiative neutrino decay and CP-violation in R-parity violating supersymmetry
在三线性R宇称破坏超对称框架下计算了Majorana中微子的辐射衰变振幅。我们的结果没有对费米子和超费米子的质量和混合做任何假设。所获得的结果是典型的通用模型与环产生的中微子质量。这个振幅与中微子质量矩阵的比较表明，这两个提供独立的探针CP违反阶段。
Radiative neutrino transition $ν\to νγ$ in strongly magnetized plasma
研究了强磁化电子-正电子等离子体对辐射中微子跃迁$\nng$的影响。在考虑光子色散和共振附近的大辐射修正的情况下，计算了中微子能量和动量的几率和平均损失。结果表明，等离子体和强磁场的联合作用使中微子能量和动量损失的几率和平均值比在纯磁场中得到的值有所降低。
Searching for radiative neutrino mass generation at the LHC
在这次演讲中，我描述了辐射中微子质量模型的一般特征，可以在大型强子对撞机探测。然后，我将介绍这种类型的新的显式模型上的约束。
Comment on Radiative Neutrino Mass Matrix with a Sterile Neutrino
在SU（2）_LxU（1）_YxSU（2）_LxU（1）_Y模型中实现了一种辐射产生中微子质量的机制，其中第一和第二族涉及SU（2）_LxU（1）_Y，而SU（2）_LxU（1）_Y是第三族特有的。第四个中微子nu_s具有U（1）_Y x U（1 π '_Y耦合，通过与e和μ的额外相互作用引入中微子混合。nu_s - nu_e的唯象自洽振荡要求nu_s与e的支配耦合。
Monte Carlo simulation of an experiment looking for radiative solar neutrino decays
我们分析了从太阳中微子辐射衰变的假设中探测可见光子的可能性。我们的研究重点是模拟日全食期间的这种测量，它是基于BP2000标准太阳模型和最新的实验信息有关的中微子属性。
Cold Dark Matter, Radiative Neutrino Mass, mu to e gamma, and Neutrinoless Double Beta Decay
宇宙学和粒子物理学中最重要和最紧迫的两个问题是：（1）冷暗物质的性质是什么？（2）在不久的将来，对无中微子双β衰变的实验能否确定中微子是一种马约拉纳粒子，即它自己的反粒子？我们发现，如果中微子仅仅因为与暗物质的相互作用而获得质量，那么这两个看似无关的问题是密切相关的。
An R-parity conserving radiative neutrino mass model without right-handed neutrinos
A. Zee（1986）和K.S. Babu（1988）是一个简单的辐射跷跷板模型，其中微小的中微子质量是在双圈水平上产生的。研究了R-宇称守恒下Zee-Babu模型的超对称推广.最轻的超伙伴粒子可以成为暗物质的候选者。我们发现，中微子的数据可以重现令人满意的当前数据从轻子味破坏，即使在的情况下，不是所有的超伙伴粒子是重的。在大型强子对撞机的现象学也进行了讨论。
Radiative Corrections to Deep-Inelastic Neutrino--Nucleon Scattering in the MSSM
本文讨论了在最小超对称标准模型（MSSM）中带电流和中性流中微子-核子深度非弹性散射的辐射修正。特别是，偏离标准模型预测的比率中性充电电流截面，$R^ν$和$R^{\barν}$，进行了研究，并在MSSM参数空间的扫描结果。
Radiative four neutrino masses and mixings
Zee提出的辐射模型是从三个中微子$(ν_{e,μ,τ})$扇区扩展到包括第四个无菌中微子$ν_s$。振荡$ν_e \leftrightarrow ν_s$（太阳），$ν_μ\leftrightarrow ν_τ$（大气）和$ν_e \leftrightarrow ν_μ$（LSND）被调用来解释所有的振荡数据与成功的关系$(Δm^2)_{atm} \simeq 2[(Δm^2)_{solar} (Δm^2)_{LSND}]^{1/2}$作为额外的奖励。
Radiative Majorana Neutrino Masses
我们提出了新的辐射机制产生马约拉纳中微子的质量，在标准模型，成功地产生辐射带电轻子质量的扩展，顺序，从重序列轻子。只有新的序贯中性轻子有一个右手伙伴，它的马约拉纳质量为马约拉纳中微子质量的产生提供了种子。用$m_{ν_τ}$饱和$50$ eV的宇宙学束缚，我们发现$m_{ν_μ}$和$m_{ν_e}$最多分别是$10^{-2}$和$10^{-3}$ eV。在简并带电希格斯玻色子玻色子的极限下，电子中微子质量可能为零。不幸的是，$ν_e - ν_τ$混合也是辐射诱导的，并且对于通过米赫耶夫-斯米尔诺夫-沃尔芬斯坦效应解决太阳中微子问题来说太小了。
We discuss a radiative type-I seesaw. In these models, the radiative generation of Dirac neutrino masses allows to explain the smallness of the observed neutrino mass scale for rather light right-handed neutrino masses in a type-I seesaw. We first present the general idea in a model independent way. This allows us to estimate the typical scale of right-handed neutrino mass as a function of the number of loops. We then present two example models, one at one-loop and another one at two-loop, in which we discuss neutrino masses and lepton flavour violating constraints in more detail. For the two-…
Radiative neutrino masses in an abelian extension of the Standard Model
本文提出标准模型的非普适阿贝尔扩展U(1)_X，通过单圈自能辐射修正使中微子获得质量，并涉及重右手中微子和马约拉纳费米子。
Radiative neutrino masses and the Cohen-Kaplan-Nelson bound
本文探讨了标准量子场论有限有效范围对中微子质量辐射模型的影响，通过将Cohen-Kaplan-Nelson关于引力暗示UV和IR截断的论证应用于圈积分，证明了该效应对模型参数空间具有重大影响。
The one-loop electroweak radiative corrections to coherent forward neutrino scattering in a medium slightly violates the tree-level universality of neutral-current contributions of three neutrino flavors to the matter potential that is relevant to neutrino oscillations in matter. We examine this small but nontrivial quantum effect by deriving the differential equations of those effective neutrino oscillation quantities with respect to the electron number density of matter. The tree-level Toshev relation $\sin 2\tildeθ_{23} \sin\tildeδ = \sin 2θ_{23} \sinδ$, which links the fundamental flavor-m…
Verifiable Radiative Seesaw Mechanism of Neutrino Mass and Dark Matter
本文提出了标准模型的一个最小扩展，其中观测到的左手中微子从单圈辐射跷跷板机制获得自然小的马约拉纳质量。这个模型有两个宇宙暗物质的候选者（一个玻色子和一个费米子）。它有一个非常简单的结构，应该在大型强子对撞机即将进行的实验中得到验证。
Scalar Neutrino as Asymmetric Dark Matter: Radiative Neutrino Mass and Leptogenesis
在最小超对称标准模型（MSSM）中，标量中微子$\tildeν_L$具有奇R宇称，但它长期以来一直被排除在暗物质候选者之外，因为它通过$Z$玻色子弹性散射离开原子核，产生比实验极限高出许多数量级的截面。我们展示了如何可以恢复作为一个暗物质候选人分裂的质量的实部和虚部的扩展MSSM标量三胞胎。因此，辐射马约拉纳中微子质量也产生。此外，标量三重态的衰变将这种不对称的暗物质的丰度与宇宙中重子的不对称性通过轻生联系起来。
Radiative Emission of Neutrino Pairs in Atoms and Light Sterile Neutrinos
原子中中微子对的辐射发射（RENP）过程对中微子的绝对质量标度、谱中微子质量服从的类型以及质量中微子的性质（Dirac或Majorana）都很敏感。本文分析了在RENP实验中检验弱带电轻子流中存在质量在eV量级的中微子与电子耦合的假设的可能性。中微子混合中eV尺度中微子的存在与无菌中微子的存在有关，无菌中微子与活性味中微子混合。目前，有许多迹象表明，$Δm^2 \sim 1~{\rm eV^2}$驱动的活动-无菌中微子振荡。我们在“3 + 1”方案中用一个无菌中微子对RENP现象进行了详细的分析。
Extension of a radiative neutrino mass model based on a cosmological view point
本文考虑TeV区辐射中微子质量模型的一个推广，以便给出宇宙暴胀的起源。这种推广也对重子数不对称性和暗物质的起源给出了一致的解释。在原模型中对中微子质量产生起关键作用的小标量耦合可能与控制暴胀的参数有关。
Radiative seesaw and degenerate neutrinos
Witten的辐射跷跷板机制在16_HHiggs旋量场作用下产生SO（10）中的右手中微子质量。本文研究了含有10_H和120_H Higgs表象的最小Yukawa结构的第二代和第三代解析解。在小的第二代质量和规范圈支配的近似下，我们得到了下列结果：（1）b-tau统一，（2）大θ_l和小θ_q的自然共存，（3）简并中微子。
Radiative Transition of Massless Neutrino in Strong Magnetic Field
在标准模型框架下研究了强磁场中无质量中微子$ν_l \to ν_l + γ$（$l = e, μ, τ$）的辐射跃迁。给出了中微子能量和动量损失的过程几率和平均值。可能的天体物理表现的过程中考虑进行了分析。
We propose that the radiative generation of the neutrino mass can be achieved by incorporating the kinetic mixing of fermion fields which arises radiatively at one-loop level. As a demonstrative example of the application of the mechanism, we present the particular case of the Standard Model extension by $U(1)_D$ symmetry. As a result, we show how neutrino masses can be generated via a kinetic mixing portal instead of a mass matrix with residual symmetries responsible for the stability of multicomponent dark matter.
Plasma induced neutrino radiative decay instead of neutrino spin light
在精确考虑介质中光子γ^* 色散的情况下，考虑了左手中微子在介质中获得的额外Wolfenstein能量引起的具有磁矩的中微子的nu_L → nu_R γ ^* 转换.结果表明，阈值出现在这个过程中，引起的光子（等离子体）的有效质量。在大多数天体物理学情况下，这个阈值没有给所谓的“中微子自旋光”留下空间。
We present a three-loop model of neutrino mass in which both the weak scale and neutrino mass arise as radiative effects. In this approach, the scales for electroweak symmetry breaking, dark matter, and the exotics responsible for neutrino mass, are related due to an underlying scale-invariance. This motivates the otherwise-independent O(TeV) exotic masses usually found in three-loop models of neutrino mass. We demonstrate the existence of viable parameter space and show that the model can be probed at colliders, precision experiments, and dark matter direct-detection experiments.
A radiative model with a naturally mild neutrino mass hierarchy
许多中微子质量模型假设至少存在两个额外的费米子，以解释测量到的太阳和大气质量分裂。然而，在这些模型中，除非引入额外的味道对称性，否则两个质量分裂之间的预测层次一般比观察到的大得多。本文提出了一个辐射中微子质量模型，它由一个重费米子单线态和两个标量扩展的标准模型组成，在非常一般的条件下，它预言了一个与实验值定性一致的中微子质量等级。
A new scheme to determine the neutrino mass matrix is proposed using atomic de-excitation between two states of a few eV energy spacing. The determination of the smallest neutrino mass of the order of 1 meV and neutrino mass type, Majorana or Dirac, becomes possible, if one can coherently excite more than 1 gram of atoms using two lasers.
We study a one-loop induced radiative neutrino model with an inert isospin triplet scalar field, in which we discuss current neutrino oscillation data, lepton flavor violations, muon anomalous magnetic moment, and a dark matter candidate. We show global analysis combining all the constraints, and briefly mention another possibility.
On Distinguishing Non-Standard Interactions from Radiative Corrections in Neutrino-Electron Scattering
我们提出了一个贡献的高阶中微子电子散射，这是一个带电的电流对应的异常轴矢量三角形和可能的非标准相互作用的贡献。它产生于具有大质量中微子的标准模型中，并在低能量下重整化了非对角轴矢量形状因子。我们表明，由于辐射修正的小尺寸，中微子-电子散射仍然提供了一些文献中提出的非标准中微子相互作用的发现潜力。
An anomaly-free U(1) gauge extension of the standard model (SM) is presented. Only one Higgs doublet with a nonzero vacuum expectation is required as in the SM. New fermions and scalars as well as all SM particles transform nontrivially under this U(1), resulting in a model of three active neutrinos and one sterile neutrino, all acquiring radiative masses. Charged-lepton masses are also radiative as well as the mixing between active and sterile neutrinos. At the same time, a residual $Z_2$ symmetry of the U(1) gauge symmetry remains exact, allowing for the existence of dark matter.
Majorana neutrino versus Dirac neutrino in ${\rm e}^{+}{\rm e}^{-} \to {\rm W}^{+}{\rm W}^{-}$ through radiative corrections
在跷跷板机制下研究了Majorana中微子对${\rm e}^{+}{\rm e}^{-}\! \rightarrow {\rm W}^{+}{\rm W}^{-}$的辐射修正。针对第四代中微子的影响，我们计算了单圈水平极化电子的W对形状因子、微分截面和前后不对称性。发现在Majorana粒子对产生的阈值处的形状因子的行为不同于Dirac粒子对产生的行为。在LEP 200和下一代直线对撞机的能量范围内，非极化电子的辐射修正量与跷跷板机制的质量参数有关，为$\sim 0.5\%$.
Radiatively Induced Neutrino Mass Matrix in a SUSY GUT Model with R-Parity Violation
为了避免Zee模型嵌入到具有R宇称破坏的超对称大统一理论中时出现的质子衰变，提出了一种基于离散Z2对称性的新思想。在对称性Z_2下，夸克和轻子质量矩阵受到严格约束。研究了辐射诱导中微子质量矩阵的容许形式。
We propose a radiatively-induced neutrino mass model at one-loop level by introducing a pair of doubly-charged fermions and a few multi-charged bosons. We investigate the contributions of the model to neutrino masses, lepton-flavor violations, muon $g-2$, oblique parameters, and collider signals, and find a substantial fraction of the parameter space that can satisfy all the constraints. Furthermore, we discuss the possibility of detecting the doubly-charged fermions at the LHC.
We propose a predictively radiative neutrino mass model with gauged $U(1)_{B-2L_{\ell_2}-L_{\ell_1}}$ symmetry in which we successfully realize two-zero textures of neutrino mass matrix depending on charge assignment for leptons and the singlet scalar fields. Then some correlations of neutrino parameters are shown where we take mass structure given by $(\ell_2, \ell_1) = (μ, τ)$ or $(μ, e)$ as a representative case. Furthermore we discuss phenomenology of the model such as lepton flavor violations, collider physics, and dark matter candidate.
Parity violating observables in radiative neutrino pair emission from metastable atoms
我们报告的可能性测量宇称违反效应的辐射中微子对发射从亚稳原子，从定向原子和出射圆偏振的光子的不对称角分布。它们的观测结果以及具有6个阈值的连续光子能谱可以解释为弱过程和QED过程的结合，即终态发射$γν_i ν_j$。该方法可以极大地帮助使用原子执行中微子质谱，系统地确定中微子质量矩阵。
Radiative Splitting of Three Degenerate Neutrinos
提出了三个简并Majorana中微子两次质量分裂的辐射起源。它可以通过扩展标准模型来实现，使其具有通常的有效维数为5的算符，产生SO（3）不变的树能级质量，以及与保持SO（3）的U（1）子群的轻子的带电标量单线态耦合。大气和太阳中微子振荡的质量分裂则分别由带电标量单重态耦合和通常的汤川耦合引起的单圈修正引起。
The scotogenic mechanism for radiative neutrino mass is generalized to include neutron-antineutron oscillation as well as proton decay. Dark matter is stabilized by extending the notion of lepton parity to matter parity. Leptogenesis is also a possible byproduct. This framework unifies the description of all these important, but seemingly unrelated, topics in physics beyond the standard model of particle interactions.
We conduct a systematic search for neutrino mass models which only radiatively produce the dimension-5 Weinberg operator. We thereby do not allow for additional symmetries beyond the Standard Model gauge symmetry and we restrict ourselves to minimal models. We also include stable fractionally charged and coloured particles in our search. Additionally, we proof that there is a unique model with three new fermionic representations where no new scalars are required to generate neutrino masses at loop level. This model further has a potential dark matter candidate and introduces a general mechanis…
The scotogenic model of neutrino mass is modified so that the dark Majorana fermion singlet $S$ which makes the neutrino massive is itself generated in one loop. This is accomplished by having $Z_6$ lepton symmetry softly broken to $Z_2$ in the scalar sector by a unique quadratic term. It is shown that $S$ is a viable freeze-in dark-matter candidate through Higgs decay.
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