M. C. Rodriguez
We consider an Supersymmetric extension of the Standard Model with some extra Higgs doublets and a global $(B - L)$, where $B$ and $L$ are the usual baryonic and lepton number respectivelly, and ${\cal Z}_{3} \otimes {\cal Z}^{\prime}_{3}$ symmetries of the non-SUSY model presented at [1]..
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In this research, we propose a modified version of the 3-3-1 model, incorporating a type I+II seesaw mechanism and Z4 discrete symmetry, as a framework for investigating lepton flavor-violating (LFV) decays. This model successfully yields the left-handed neutrinos mass square difference in the eV scale, with specific values of mass square differences; and generates mixing angles that align with experimental data. Furthermore, we develop SARAH and SPheno algorithms tailored for our modified model, enabling us to estimate the magnitude of LFV observables. Our calculations indicate favorable resu…
We consider an extension of the standard electroweak model with three Higgs doublets and global $B-L$ and $\mathbb{Z}_2$ symmetries. Two of the scalar doublets are inert due to the $\mathbb{Z}_2$ symmetry. We calculated all the mass spectra in the scalar and lepton sectors and accommodate the leptonic mixing matrix as well. We also include an analysis of the scalar sector, showing that the potential is limited from below, and we obtain the masses of the scalar sector. Furthermore we consider the effects of the model on the anaomalous magnetic dipole of charged leptons and the $μ\to eγ$ decay. …
Schizophrenic active neutrinos and exotic sterile neutrinos
我们在一个模型中实现了一个活跃中微子的分裂方案，在这个模型中也有奇异的右手中微子，使得一个模型没有局域U（1）_（B-L）反常。两个右手中微子携带B-L=-4，而第三个携带B-L=5。
Right-handed Neutrinos in Low-Energy Neutrino-Electron Scattering
本文考虑了在弱相互作用中，除了左手中微子的标准矢量耦合和轴向耦合外，右手中微子的奇异标量耦合也参与的情形。研究基于低能$(ν_μ e^{-})$和$(ν_{e} e^{-})$散射过程。主要目的是显示右手中微子在上述过程中的存在如何改变实验室微分截面与标准模型预测的关系。这两个过程都是在四费米子点相互作用的水平上研究的。中微子被假定为极化的狄拉克费米子，质量很大。在实验室微分截面中，出现了左手中微子的标准矢量耦合与右手中微子的奇异标量耦合之间的新的干涉项，该干涉项在无质量中微子的极限下不为零。这个额外的贡献，包括中微子极化的横向分量的信息，产生的反冲电子的角分布的方位角不对称性。这种规律性可能是右手中微子参与中微子-电子散射的一个标志。未来利用强极化人工中微子源进行低能高精度中微子-电子散射实验，将有助于研究R手中微子的奇异效应。
We explore leptogenesis within the E6 inspired U(1) extension of the MSSM in which exact custodial symmetry forbids tree-level flavour-changing transitions and the most dangerous baryon and lepton number violating operators. This supersymmetric (SUSY) model involves extra exotic matter beyond the MSSM. In the simplest phenomenologically viable scenarios the lightest exotic fermions are neutral and stable. These states should be substantially lighter than 1 eV forming hot dark matter in the Universe. The low-energy effective Lagrangian of the SUSY model under consideration possesses an approxim…
Right-handed Neutrinos in $ν_μ + e \to ν_μ + e$ Elastic Scattering
本文考虑了在低能中微子-电子散射中，除了标准左手$(V, A)_{L}$耦合外，还考虑了奇异右手标量$S_{R}$耦合的情况。主要目标是显示右手中微子的存在下，在$(νe)$散射改变实验室微分截面的标准模型的预测。我们在四费米子点相互作用的水平上考虑了$(νe)$过程。μ子中微子被假定为质量很大的极化狄拉克费米子。在实验室微分截面中，出现了左手中微子的标准$V_{L}$耦合与右手中微子的奇异$S_{R}$耦合之间的新的干涉项，该干涉项在无质量中微子的极限下不为零。这个新的贡献，包括有关的横向中微子极化的信息，产生的反冲电子的角分布的方位角不对称。这种规律性可以证明在$νe$散射中存在R手中微子。
Right-handed Dirac Neutrinos in $νe^{-}$ Scattering and Azimuthal Asymmetry in Recoil Electron Event Rates
本文考虑了在低能$(ν_μe^{-})$和$(ν_{e}e^{-})$散射过程中，左手中微子的标准矢量V、轴向A耦合以及右手中微子的奇异标量S、张量T和赝标耦合的参与.中微子被假定为大质量狄拉克费米子，并且被极化。这两个反应的研究在四费米子点相互作用的水平。主要目标是表明，右手中微子的存在的物理后果是一个外观的方位角不对称的反冲电子的角分布所造成的非零干扰项之间的标准和异国情调的耦合，成比例的横向中微子极化矢量。我们还指出，如果太阳磁场中的中微子螺旋度旋转$(E_ν < 1 MeV)$发生，则太阳中微子散射的反冲电子的方位角不对称性也会产生类似的效应。这种效应也可能来自标准$(V, A)_{L}$和特殊$(S, T, P)_{R}$耦合之间的干扰项。具有良好角分辨率的新型中微子探测器可以探测事例数的方位不对称性。
Prominent Decay Modes of a Leptophobic Z'
最近在E群$_6$中发现了一个无反常U（1）电荷$Q'$，熟悉的轻子（左手和右手电子以及左手中微子）都有$Q' = 0$。指出E $_6$物质多重态中的几个{ \it奇异}轻子的$Q'$电荷相当大，从而预言耦合到$Q'$的所谓"疏轻子“$Z'$玻色子的衰变有一半是到这些奇异轻子的.其他的大$Q'$电荷包括标准上型夸克和奇异下型夸克。当$f$是标准的上型夸克、奇异的下型夸克或奇异的轻子时，在$u \bar u \to Z' \to f \bar f$通道中预期会有大量的前后不对称。
In this work we will extend the inert-doublet model (IDM) by adding a new $U(1)_{F}$ gauge symmetry to it, under which, a $Z_{2}$ even scalar ($ϕ_{2}$) and $Z_{2}$ odd right handed component of two exotic charged leptons $(F_{eR},\ F_{μR})$, are charged. We also add one $Z_{2}$ even real scalar ($ϕ_{1}$) and one complex scalar ($ϕ$), three neutral Majorana right handed fermions ($N_{1},\ N_{2},\ N_{3}$), two left handed components of the exotic charged leptons $(F_{eL},\ F_{μL})$ as well as $F_τ$ are all odd under the $Z_{2}$, all of which are not charged under the $U(1)_{F}$. With these new p…
We discuss non-perturbative corrections to the neutrino sector, in the context of a D-brane Pati-Salam-like model, that can be obtained as a simple alternative to $SO(10)$ GUT's in theories with open and unoriented strings. In such D-brane models, exotic stringy instantons can correct the right-handed neutrino mass matrix in a calculable way, thus affecting mass hierarchies and modifying the see-saw mechanism to what we name exotic see-saw. For a wide range of parameters, a compact spectrum of right-handed neutrino masses can occur that gives rise to a predictive scenario for low energy observ…
In the first part of this thesis, we consider an extension to the Standard Model composed by a Massive Vector Doublet under SU(2)L and a Left-handed Heavy Neutral Lepton. We study the production of these exotic leptons with a Same Flavor Opposite Sign standard lepton pair, and jets. We establish limits on the parameter space considering previous searches in this final state. After the limit definition, we study a modification on the event selection criteria in order to increase the possibility of probing these new particles at the Large Hadron Collider. Finally, we perform a parameter scan con…
Probing Left-handed Heavy Neutral Leptons in the Vector Scotogenic Model
本研究在含SU(2)$_L$有质量矢量二重态与左手重中性轻子的标准模型扩展框架下，分析奇异轻子的产生过程，发现矢量玻色子融合的双轻子角分布可作为模型信号，并结合实验给出参数空间限制。
In this work we show that, by introducing two $SU(3)_{c}\times SU(2)_{L}$ singlet right handed fermions carrying opposite $U(1)_{Y}$ charges and while their left handed counterparts are singlet under $SU(3)_{c}\times SU(2)_{L}$ and neutral under $U(1)_{Y}$, in the regime where the new charged lepton masses are in the electroweak scale it will be able to explain the small neutrino masses via minimum-inverse seesaw scenario (MISS) as well as the reported $R(K^{(*)})$ and muon $(g-2)$ discrepancies. Also when the charged fermion masses are well above the electro weak scale the model can not expla…
In this letter we study new relevant phenomenological consequences of the right-handed heavy neutrinos with masses at the ${\cal O}(1)$ TeV energy scale, working within the context of the Inverse Seesaw Model that includes three pairs of quasi-degenerate pseudo-Dirac heavy neutrinos. We propose a new exotic signal of these heavy neutrinos at the CERN Large Hadron Collider containing a muon, a tau lepton, and two jets in the final state, which is based on the interesting fact that this model can incorporate large Lepton Flavor Violation for specific choices of the relevant parameters, particula…
Scattering of neutrinos on a polarized electron target as a test for new physics beyond the Standard Model
本文分析了中微子束在极化电子靶上的散射，并预测了标准模型之外的两种理论上可能的情形。在这两种情况下，狄拉克中微子都被假设为质量很大。首先，我们考虑了左手中微子的复矢量V和轴向A耦合之间CP破坏相位的存在如何影响微分截面的方位角依赖性。未来的超束流和中微子工厂实验将为轻子CP破坏研究提供独特的机会，如果建立具有良好事件重建能力的大型磁化取样量热计。接下来，我们考虑的情况下，除了标准的矢量V和轴向的左手中微子耦合的右手中微子的奇异标量S耦合的参与。我们的主要目标是展示在上述过程中，R-手中微子的存在如何改变反冲电子的光谱与预期的标准模型预测的关系，使用当前对非标准耦合的限制。微分截面中标准耦合与奇异耦合之间的干涉项依赖于入射中微子的横向极化与靶的横向电子极化之间的夹角$α$，并且在无质量中微子的极限下不为零.在反冲电子的能谱中检测到对这个角度的依赖性将是中微子-电子散射中R-手中微子存在的标志。为了使这项测试可行，需要确定极化的人工中微子源。
Quasi-Dirac neutrinos in a model with local $B-L$ symmetry
在具有$B-L$规范对称性的模型中，右手中微子可能具有奇异的$B-L$局域电荷分配：其中两个具有$B-L=-4$，另一个具有$B-L=5$。因此，自然地，将具有相同$B-L$电荷的右手中微子容纳在离散$S_3$对称性的双重态中，而将第三个容纳在单一态中。如果右手中微子的Yukawa相互作用在$S_3$下是不变的，那么在这个模型中准Dirac中微子方案自然产生。然而，我们将说明在这个方案中如何能够给出一个与大亚湾核电站结果一致的$θ_{13}$值。例如，在涉及右手带电轻子的汤川相互作用中，$S_3$对称性必须破缺。
FCNC in the 3-3-1 model with right-handed neutrinos
研究了含有右手中微子的$SU(3)_c\otimes SU(3)_L\otimes U(1)_X$模型中来自新的非普适中性规范玻色子和来自非么正夸克混合矩阵的变味中性流。通过施加作为实验约束的测量值的3x 3夸克混合矩阵，中性介子混合，和边界测量值的直接味改变中性电流过程中，最大的混合的已知夸克与外来的，与新的源味改变中性电流被确定。我们的主要结果是，当$|V_{tb}|$值小于1时，可以得到大的稀有顶衰变率，如$t\to cγ$、$t\to cZ$和$t\to cg$（其中g代表胶子场）;但如果是$|V_{tb}|\approx 1$，则只有当新的中性规范玻色子的质量大于10 TeV时，模型才能在目前的实验极限下生存。
Right-handed chirality of muon neutrinos in polarized muon decay at rest
本文分析了极化μ子的静态衰变（PMDaR），其中除了考虑标准V-A相互作用外，还考虑了非标准V+A相互作用。研究表明，Dirac μ子中微子的角能分布对左手征μ子中微子的标准V-A耦合和右手征μ子中微子的奇异V+A耦合之间的干涉项敏感，它们与μ子中微子自旋极化的横向分量成正比.这些干涉在无质量极限下不消失，并包含了检验CP破坏（CPV）的相对相位。它允许计算一个假设的配置的检测器的情况下，SM预测的中微子通量，和中微子通量的上限为左，右μ子中微子混合物。我们还证明了中微子质量和混合的影响是微小的修正，可以忽略不计。最重要的结论是，即使在无质量极限下，当奇异相互作用V+A与电子观测值相反时，在自旋1/2量子态中，存在与左手和右手螺旋度分量的混合有关的物理效应，其中所有可能的干扰都消失了。
Right-Handed Currents in B Decay Revisited
我们严格地重新检查的情况下，对一个相当大的右手组件在$b\to c$充电电流耦合强度$ξ$相对于传统的左手电流。使用CLEO的数据上的衰变$B\to D^*\ell ν$，以及我们的知识$V_{cb}$提取的包容性和排他性的过程中，我们能够确定目前允许的参数空间$ξ$通过HQET。然后，我们确定了几个可观的，可以在$B$工厂测量，以加强这些约束或以其他方式观察右手电流。这个参数空间区域被发现是一致的低程度的$Λ_b$极化所确定的ALEPH以及测量的带电轻子和中微子的能谱从$b$衰变的L3。我们讨论了未来半轻子衰变分布的测量如何区分奇异的$Λ_b$去极化机制和右手电流的存在。在CLEO允许的参数空间内，以左右对称模型为指导，我们详细地寻找了导致$B$半轻子分支分数和$B$衰变中粲夸克平均产额减少的特定子区域.结果提供了一个具体的实现Voloshin早期的建议，但可能会导致潜在的困难与某些企鹅介导的衰变过程。
In this paper we review some mechanisms that provide light neutrinos in the framework of 3-3-1 gauge models without exotic leptons. In regard to the minimal 3-3-1 model, we call the attention to the fact that the perturbative regime of the model goes until 5 TeV. This requires alternative mechanisms in order to generate light neutrinos. In this review we discuss two mechanisms capable of generating light neutrinos in the framework of the minimal 3-3-1 model. In regard to the 3-3-1 model with right-handed neutrinos, we call the attention to the fact that in it mechanisms that generate light lef…
Invisible neutron decay and light BSM particles
本文研究了通过引入右旋中微子等轻量BSM粒子，如何在更低维度下构造不可见中子衰变算符，并探讨了相关实验搜索。
Exotic properties of neutrinos using effective Lagrangians and specific models
这篇博士论文介绍了利用有效场论和模型之间的协同作用研究中微子非标准性质的几项工作。首先通过有效的运营商，这使得讨论其现象学的后果，并得出估计的质量尺度的重粒子需要诱导新的相互作用的现象进行分析。在第二阶段，我们提出的模型，实现有效的运营商，使我们能够检查的结论有效场论，以及提取新的现象学特征的情况下考虑。正文分为两个部分：第一部分我们将这些想法应用到产生右手中微子磁偶极矩的有效相互作用中，第二部分我们讨论一族不含夸克的违反轻子数的算子，它可以允许大的无中微子双$β$衰变率和小的中微子质量。右手中微子磁矩有可能出现在许多不同的场景中，而相关现象的未观测允许限制它们的值，从而限制相关的新物理尺度。在正文的第二部分中讨论的运营商可以潜在地主导中微子双$β$衰变，并提供信号，在下一代的实验，他们可以根据两个末态轻子的手征性进行分类，并诱导中微子质量矩阵与一个明确的层次结构相关的带电轻子的质量。在这两种情况下，我们都提供了实现现象学的示例模型，并讨论了它们在正在进行的和不久的将来的实验中的可观察性。
In this work we extend the SM by introducing only exotic scalars and leptons and show that within the reasonable error limits, both the observed anomalies in $R(D^{(*)})$ and $R_{K^{(*)}}$ can be explained along with satisfying all the constrains from nuetral meson oscillations, precision Z-pole data etc. In a trivial extension of our model with addition of three heavy right handed neutrinos, explaining the small masses of neutrinos and generation of Baryon excess via leptogenesis is possible as well. The disagreement between SM prediction and experimental data in muon (g-2) measurements can b…
We investigate the phenomenology of singlet scalar dark matter in a simple $B-L$ gauge extension of the Standard Model where the dark matter particle is charged under the $U(1)_{B-L}$ symmetry. The non-trivial gauge anomalies are cancelled with the introduction of three exotic fermions with $B-L$ charges as $-4,-4,5$, instead of right-handed neutrinos $ν_{Ri}~(i=1,2,3)$ with $B-L=-1$ in conventional $U(1)_{B-L}$ model. Without the need of any ad-hoc discrete symmetry, the $B-L$ charge plays a crucial role in stabilizing the dark matter. We make a comprehensive study of dark matter phenomenolog…
Large Right Handed Rotations, Neutrino Oscillations and Proton Decay
在标准模型（SM）中无法观察到右手（RH）旋转。这种自由被用来给出唯象正确的质量矩阵的各种不同的形式，这是费米质量模型激增的原因之一。然而，SM必须扩展，在大多数扩展中，RH电流出现在更高的能量尺度。在这些能量的RH旋转不再无关紧要，它们可以影响中微子振荡，质子衰变，重子不对称，R-宇称破坏相互作用等，我们研究了大统一理论中大RH混合的可能影响。这些是有趣的，不仅因为大的混合诱导大的影响。它们通过轻子的LH混合和d夸克的RH混合之间的关系（"$d - \ell$对偶性“）与大统一理论中的大轻子混合密切相关，并且可以显著改变质子衰变的分支比。对质子衰变通道和中微子振荡的观测，将使我们了解相对论旋转，从而大大减少费米子质量矩阵的自由度。一些有趣的例子进行了详细研究。特别是一个新的$E_6$模型，它通过与奇异的$E_6$费米子混合，自然地实现了$d$ - $\ell$对偶。
More Supersymmetric Standard-like Models from Intersecting D6-branes on Type IIA Orientifolds
我们提出了一类新的超对称类标准模型从IIA型$\IT^6/(\IZ_2\times \IZ_2)$ orientifold相交的D 6-膜。D 6-膜可以包裹$\IT^6=\IT^2\times \IT^2\times \IT^2$的一般超对称三圈，并且任何$\IT^2$都可以倾斜。这些模型仍然受到额外的外来因素的影响，但是我们得到了希格斯二重态较少的解，以及从同一交叉扇区产生的所有三个左手夸克和轻子族的模型，以及具有三个左手和右手夸克和轻子族副本的真正左右对称模型的例子。
Mixing-induced CP Asymmetries in Radiative B Decays in and beyond the Standard Model
在标准模型（SM）中，辐射$\bar B^0$和$\bar B_s$衰变中的光子主要是左旋的。因此，$b\to sγ$和$b\to dγ$中混合诱导的CP不对称性分别被$m_s/m_b$和$m_d/m_b$抑制，并且非常小。在SM的许多扩展中，例如左右对称模型（LRSM），具有奇异费米子的SU（2）xU（1）模型和超对称模型，右手光子的振幅与虚重费米子质量成正比，这可能导致大的不对称性。作为一个例子，在LRSM，不对称大于50%是可能的，即使当辐射衰减率测量与SM预测一致。
We propose a predictive inert 2 Higgs doublet model, where the Standard Model (SM) symmetry is extended by $S_{3}\otimes Z_{2}\otimes Z_{12}$ and the field content is enlarged by extra scalar fields, charged exotic fermions and two heavy right-handed Majorana neutrinos. The charged exotic fermions generate a nontrivial quark mixing and provide one-loop-level masses for the first- and second-generation charged fermions. The masses of the light active neutrinos are generated from a one loop-level radiative seesaw mechanism. Our model successfully explains the observed SM fermion mass and mixing …
Leptogenesis and Dark Matter-Nucleon Scattering Cross Section in the SE6SSM
研究了SE6SSM模型中由最轻中性奇异费米子和引力微子组成冷暗物质，在低重加热温度下通过右手征中微子衰变诱导重子不对称性，并探讨了参数空间约束及对撞机唯象学意义。
Neutrino masses and the scalar sector of a B-L extension of the standard model
本文考虑了一个基于规范对称性SU（2）_LXU（1）_Y'XU（1）_B-L的电弱模型，该模型中的右手中微子具有不同的奇异B-L量子数。由于这个特殊的功能，我们能够写汤川条款，右手中微子质量条款，与标量场，可以开发属于不同的能量标度的真空期望值。我们对标量和Yukawa中微子扇区进行了详细的研究，结果表明，该模型与太阳和大气中微子质量标度和摩擦极大混合矩阵是相容的，并且如果考虑Z_2对称性，我们还发现了暗物质的候选者。
The breakdown of E_6 within the supersymmetric (SUSY) Grand Unified Theories (GUTs) can result in SUSY extensions of the standard model (SM) based on the SM gauge group together with extra U(1) gauge symmetry under which right-handed neutrinos have zero charge. In these U(1)_N extensions of the minimal supersymmetric standard model (MSSM) a single discrete \tilde{Z}^H_2 symmetry may be used to suppress the most dangerous operators, that give rise to proton decay as well as non-diagonal flavour transitions at low energies. The SUSY models under consideration involves Z' and extra exotic matter …
Neutrino mass generation via the inverse seesaw mechanism in a $U(1)_{B-L}$ gauge extension
本文在 $U(1)_{B-L}$ 规范扩展中研究逆跷跷板机制的无反常实现，通过引入四至八个右手费米子并添加额外单态费米子，构造出满足反常方程且荷为有理数的可行解，并探讨其对暗物质候选者的现象学意义。
(Pseudo)-Dirac neutrinos and leptogenesis
我们讨论如何狄拉克中微子可以自然地产生超对称性，以及它们如何允许阿弗莱克-丁leptogenesis的情况下，在其中产生的sneutrino部门，其中的左部分被转移到重子不对称性通过sphaleron过渡的左右不对称。除了右手中微子外，不需要向MSSM添加任何外来场。
We study the phenomenology of a light (GeV scale) sterile neutrino sector and the pseudo-Goldstone boson (not the majoron) associated with a global symmetry in this sector that is broken at a high scale. Such scenarios can be motivated from considerations of singlet fermions from a hidden sector coupling to active neutrinos via heavy right-handed seesaw neutrinos, effectively giving rise to a secondary, low-energy seesaw framework. Such scenarios allow for rich phenomenology with observable implications for cosmology, dark matter, and direct searches, involving novel sterile neutrino dark matt…
Displaced vertices and long-lived charged particles in the NMSSM with right-handed sneutrinos
我们研究LHC的位移顶点和长寿命的带电粒子的背景下的次最小超对称标准模型与右手（RH）sneutrinos的签名。在这种结构中，RH中微子可以直接从希格斯衰变中产生，或者当RH中微子是最轻的超对称粒子时，与RH中微子结合产生。RH中微子通常是长寿命的，因为它的衰变宽度与中微子汤川成正比，这是一个预计很小的参数。因此，RH中微子晚期衰变可以在LHC上产生位移的顶点，这可以通过衰变产物来识别，其中涉及两个轻子（2l+ MET）或一个轻子与两个喷流（ljj）。我们模拟了当前LHC配置（质心能量为8 TeV，积分亮度L=20 fb^-1）和未来配置（13 TeV，L=100 fb^-1）的信号。我们表明，该模型的参数空间的一个区域可以探测和RH中微子质量可以重建从两个轻子不变的质量分布的端点或两个喷流加一个轻子的质量分布的中心值。这种建筑的另一个异国情调的签名是一个长寿的stau的生产。如果stau是次轻的超对称粒子，它可以通过涉及小中微子Yukawa的图衰变，并会逃离探测器，留下特征性的痕迹。我们还模拟了这个信号的各种基准点，并表明该模型可以达到未来运行的大型强子对撞机。
The flavour lepton symmetry is gauged for both the Standard Model flavor group and its extension with three degenerate right-handed neutrinos. As a consequence of anomaly cancellation, exotic leptons are introduced which induce a see-saw mechanism that generates the masses of the SM leptons. The model is compared with Minimal Flavour Violation, the difference between the low-energy effective operators resulting is identified, as well as the distinctive experimental signals, particularly promising in the $μ-τ$ sector.
Proton Stability in S_4 x Z_2 Flavor Symmetric Extra U(1) Model
本文基于E_6激发的具有S_4 × Z_2味对称的额外U（1）模型研究质子稳定性。在这个模型中，质子的长寿命是通过味对称性从几个方面来实现的。我们对质子衰变的抑制机制进行了分类，并解释了味道对称性是如何工作的。有一个有趣的解决方案，例如，在真空期望值（VEV）的一个特殊方向上，重子数破坏相互作用被取消。在适当大小的VEV抑制质子衰变的情况下，当奇异夸克质量为O（TeV）时，VEV的允许区域存在。从奇异夸克的寿命约束出发，右手中微子的质量应该在10^{12} GeV左右的窄范围内。
Collider phenomenology of the E6SSM
我们考虑特殊超对称（SUSY）标准模型（E6 SSM）的碰撞签名。这个受E6启发的超对称模型是基于SM规范群加上额外的U（1）规范对称性，在该规范对称性下，右手中微子具有零电荷。为了确保反常抵消和规范耦合统一，E6SSM的低能物质含量涉及MSSM之外的额外奇异物质。我们讨论了对撞机签名与生产的新粒子预测的E6 SSM，并考虑这个模型的影响，暗物质和希格斯现象。由于E6SSM中的奇异夸克既可以是双夸克，也可以是轻夸克，它们可能为LHC提供壮观的新物理信号。
Classification of minimal models producing b, c and tau masses at one-loop level
针对标准模型无法解释的费米子质量层级问题，分类得到25种含四个奇异多重态的最小模型，其中部分模型可产生单圈中微子狄拉克质量或类WIMP暗物质，基准模型可精确复制标准模型Yukawa耦合。
We propose a new anomaly-free and family nonuniversal $\mathrm{U}(1)'$ extension of the standard model with the addition of two scalar singlets and a new scalar doublet. The quark sector is extended by adding three exotic quark singlets, while the lepton sector includes two exotic charged lepton singlets, three right-handed neutrinos and three sterile Majorana leptons to obtain the fermionic mass spectrum of the standard model. The lepton sector also reproduces the elements of the PMNS matrix and the squared-mass differences data from neutrino oscillation experiments. Also, analytical relation…
A Renormalisation Group Equation Study of the Scalar Sector of the Minimal B-L Extension of the Standard Model
本文给出了标准模型的非奇异极小U（1）扩展的一个循环的重整化群方程的完整集合。它包括所有的模型，是异常免费的SM费米子内容增加了一个右手（RH）中微子每一代。然后，我们追求的纯B-L模型的数值研究，推导出平凡性和真空稳定性边界上的一个扩大的标量扇区，包括一个额外的希格斯单线场相对于SM。
Gauging the Way to MFV
提出了一个具有规范味对称的UV完全模型，它近似实现了R宇称破坏超对称中的全纯最小味破坏。以前的工作表明，施加MFV作为一个animator很容易逃避直接的约束，并有有趣的对撞机现象。在这项工作中的模型自发地打破风味对称性和功能的最小“异国情调”的领域内容需要取消异常。味规范玻色子呈现出一种倒置的层次结构，因此与第三代相关的玻色子是最轻的。这使得低能量的味道约束很容易满足，并留下了在LHC上获得味道规范玻色子的可能性。通常的MSSM RPV算符都被新的规范对称性所禁止，但该模型允许一个既违反R宇称又违反重子数的纯“奇异”算符。由于奇异场与类MSSM的右手夸克混合，味破缺后对角化全质量矩阵将该算子转换为三线性重子数违反算子UDD，味系数均被汤川耦合的三次方抑制。有一个限制，该模型实现精确的MFV，我们计算修正远离MFV，表明它们是在理论控制下，并发现该模型是可行的，在大区域的参数空间。
A non-universal $U(1)_{X}$ extension to the Standard Model composed of two scalar doublets and two scalar singlets together with three additional quark singlets and two lepton singlets and three generations of right-handed and Majorana neutrinos is made to explain lepton mass hierarchy, neutrino masses via inverse seesaw mechanism and muon anomalous magnetic moment in an anomaly free framework. In the present model, exotic and Standard Model particles acquire mass thanks to vacuum expectation values at different scales, yet the electron and the lightest neutrino are tree level massless but mas…
Here I present the extension to $ν$MSM model by adding a $U(1)'$ gauge symmetry under which right-handed fermions including sterile neutrinos and exotic Higgs scalar are charged. This model explains 3.5 keV line observed by XMM-Newton telescope as well as Galactic Center Excess(GCE) detected by Fermi-LAT satellite. The proposed model also accounts for recent diphoton excess of mass around 750 GeV produced in ATLAS and CMS detectors. Cosmological inconsistencies such as baryon asymmetry can also be explained. Verification of presented model is possible with current experimental techniques and l…
We investigate the pair-production of right-handed neutrinos via the Standard Model (SM) Higgs boson in a gauged $B-L$ model. The right-handed neutrinos with a mass of few tens of GeV generating viable light neutrino masses via the seesaw mechanism naturally exhibit displaced vertices and distinctive signatures at the LHC and proposed lepton colliders. The production rate of the right-handed neutrinos depends on the mixing between the SM Higgs and the exotic Higgs associated with the $B-L$ breaking, whereas their decay length depends on the active-sterile neutrino mixing. We focus on the displ…
In this paper, we will consider a cosmological model with two topological transitions of the space. The smooth 4-dimensional spacetime of the model admits topological transitions of its 3-dimensional slices. The whole approach is inspired by a class of exotic smoothness structure on $S^{3}\times\mathbb{R}$. In particular, this class of smoothness structures induces two topological transitions. Then, we are able to calculate the energy scales as associated to these topological transitions. For the first transition we will get the value of the GUT scale and the energy of the second transition is…
Lifting Slepton Masses with a Non-universal, Non-anomalous U(1)'_{NAF} in Anomaly Mediated SUSY breaking
我们用非反常族U（1 π '_{NAF}）规范对称性推广了最小超对称性标准模型.所有的规范异常都被取消，除了三个右手中微子之外没有其他的外来物质。与U（1 π ′_{NAF}}对称性相关的FID项导致对slepton平方质量的额外正贡献。在RG不变的方式，这从而解决了快子slepton质量问题的异常介导的超对称破缺。此外，U（1 π '_{NAF}}对称性自然地产生了费米子质量等级和混合角，并决定了超粒子的质量谱。
We propose a predictive model based on the $SU(3)_C\times SU(3)_L\times U(1)_X$ gauge symmetry, which is supplemented by the $D_4$ family symmetry and several auxiliary cyclic symmetries whose spontaneous breaking produces the observed SM fermion mass and mixing pattern. The masses of the light active neutrinos are produced by an inverse seesaw mechanism mediated by three right handed Majorana neutrinos. To the best of our knowledge the model corresponds to the first implementation of the $D_4$ family symmetry in a $SU(3)_C\times SU(3)_L\times U(1)_X$ theory with three right handed Majorana ne…
Muon conversion to electron in nuclei within the $μν$SSM with a 125 GeV Higgs
在$ν$超对称标准模型（$μν$ SSM）的$μ$框架下，三个奇异的右手中微子超场诱导了新的轻子味破坏源.在这项工作中，我们详细研究了在$μν$ SSM中的μ子到电子的转换。在125 GeV的Higgs能量下，计算结果表明，在$μν$ SSM中，原子核内的$μ-e$转换率可以达到实验上界，这一上界可以用未来的实验灵敏度来探测.
We present an $A_4$ flavor extended $\rm B-L$ model for realization of eV scale sterile neutrinos, motivated by the recent experimental hints from both particle physics and cosmology. The framework considered here is a gauged $\rm B-L$ extension of standard model without the introduction of right-handed neutrinos, where the gauge triangle anomalies are canceled with the inclusion of three exotic neutral fermions $N_{i}$ ($i=1,2,3$) with $\rm B-L$ charges $-4,-4$ and $5$. The usual Dirac Yukawa couplings between the SM neutrinos and the exotic fermions are absent and thus, the model allows natu…
We propose a supersymmetric extension of the anomaly-free and three families nonuniversal $U(1)$ model, with the inclusion of four Higgs doublets and four Higgs singlets. The quark sector is extended by adding three exotic quark singlets, while the lepton sector includes two exotic charged lepton singlets, three right-handed neutrinos and three sterile Majorana neutrinos to obtain the fermionic mass spectrum. By implementing an additional $\mathbb{Z}_2$ symmetry, the Yukawa coupling terms are suited in such a way that the fermion mass hierarchy is obtained without fine-tuning. The effective ma…
We propose a supersymmetric extension of the anomaly-free and three families nonuniversal $U(1)$ model, with the inclusion of four Higgs doublets and four Higgs singlets. The quark sector is extended by adding three exotic quark singlets, while the lepton sector includes two exotic charged lepton singlets, three right-handed neutrinos and three sterile Majorana neutrinos to obtain the fermionic mass spectrum. By implementing an additional $\mathbb{Z}_2$ symmetry, the Yukawa coupling terms are suited in such a way that the fermion mass hierarchy is obtained without fine-tuning. The effective ma…
The phenomenological implications of the E6 inspired supersymmetric models based on the Standard Model gauge group together with extra U(1)_N gauge symmetry under which right-handed neutrinos have zero charge are examined. In these models single discrete symmetry forbids the tree-level flavour changing processes and the most dangerous operators that violate baryon and lepton numbers. The two-loop renormalisation group flow of the gauge and Yukawa couplings is explored and the qualitative pattern of the Higgs spectrum in the case of the quasi-fixed point scenario is discussed. These E6 inspired…
E$_6$SSM
在这次演讲中，我们讨论了一个$E_6$启发的超对称（SUSY）模型与额外的$U(1)_{N}$规范对称性下，右手中微子具有零电荷。在这个特殊的超对称标准模型（E $_6$ SSM）中，$μ$ -项是在电弱对称破缺之后动态产生的。我们指定的粒子内容的模型，并认为，存在的$Z'$和外来粒子预测E $_6$ SSM允许最轻的希格斯玻色子显着重于MSSM和NMSSM。本文还讨论了E $_6$ SSM在LHC上的其他可能的表现。
$SU_{L}(4)\times U(1)$ model for electroweak unification and sterile neutrinos
在不含带奇异电荷的费米子的电弱统一定域规范群$SU_{L}(4)\times U(1)$中，研究了中微子物理中的一些基本问题，如新的能量标度、中微子质量与最轻荷电费米子质量之间的巨大差距、eV质量范围内可能存在无菌中微子等.结果表明，中微子的质量谱可以与其它费米子的质量谱解耦。进一步的正常跷跷板机制的中微子，右手中微子马约拉纳质量为$M\gg M_{\text{weak}}$以及一个新的eV尺度可以容纳。eV尺度的跷跷板可能会在液体闪烁中微子探测器（LSND）和MiniBooNE（MB）实验结果以及未来的中微子实验中表现出来。
The Little Flavor model is a close cousin of the Little Higgs theory which aims to generate flavor structure around TeV scale. While the original Little Flavor only included the quark sector, here we build the lepton part of the Little Flavor model and explore its phenomenology. The model produces the neutrino mixing matrix and Majorana masses of the Standard Model neutrinos through coupling to heavy lepton partners and Little Higgses. We combine the usual right-handed seesaw mechanism with global symmetry protection to suppress the Standard Model neutrino masses, and identify the TeV partners…
Fermion Mass Hierarchy and Proton Stability from Non-anomalous U(1)_F in SUSY SU(5)
我们提出了一个结合非反常U（1）_F对称性的超对称SU（5）模型。我们发现了一组U（1）_F荷，它们自动地导致了夸克、轻子和中微子真实的质量等级和混合模式。在我们的模型中，所有的规范反常，包括[U（1）_F]^3反常，都被取消了，而不需要格林-施瓦兹机制或奇异场。在我们的模型中，由5维算子介导的质子衰变被自动抑制，因为由最大右手中微子质量设定的尺度远小于GUT尺度。
Medium effects in the pion pole mechanism (photon photon --> pion-zero --> neutrino-R antineutrino-L (neutrino-L antineutrino-R)) of neutron star cooling
本文研究了中子星中微子通过奇异反应通道γγ--> π^0--> ν_R \bar{ν_L}（ν_L \bar{ν_R}）冷却的核介质效应。在整个论文中，我们讨论了右手中微子、大质量左手中微子和标准无质量左手中微子的不同可能性（然后只允许与中等修改顶点反应）。结果表明，多粒子效应使该反应通道的速率降低了6-7个数量级，但并没有降低相应的π^0ν \bar ν耦合的实验上限.文中还讨论了在不同的物理情况下，例如在某些中子星的夸克色超导核中，反应通道的其它可能性。我们证明了在温度T <（0.1-10）MeV（取决于有效π介子质量和衰变宽度）的色味锁定超导相中，该过程是可行的最有效的中微子冷却过程，尽管反应的绝对值相当小。
From Peccei Quinn symmetry to mass hierarchy problem
本文提出非普适U(1)_X扩展标准模型并引入PQ对称性，以解决质量层级和强CP问题，还解释了中微子质量来源及轴子相关味改变过程。
Three-Family Supersymmetric Standard-like Models from Intersecting Brane Worlds
我们在T^6/（Z_2 x Z_2）和D 6-膜上构造了具有标准模型规范群SU（3）_C x SU（2）_L x U（1）_Y的前三族N=1超对称弦模型.除了最小的超对称标准模型粒子外，该模型还包含右手中微子、手征（但无反常）的奇异多重态和额外的矢量多重态。我们讨论了这个模型的一些唯象特征。
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