M. Góźdź, F. Simkovic, W. A. Kamiński
The presence of trilinear R-parity violating interactions in the MSSM lagrangian leads to existence of quark-squark and lepton-slepton loops which generate mass of the neutrino. By introducing interaction with an external photon the magnetic moment is obtained. We derive bounds on that quantity being around one order of magnitude stronger than those present in the literature.
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It is firmly believed that a signal of neutrinoless double beta decay can unquestionably confirm the Majorana nature of neutrinos. However we notice that a Majorana neutrino mass induced after some neutrinoless double beta decay processes can be accidentally cancelled by another Majorana neutrino mass induced before any neutrinoless double beta decay processes. This realistic cancellation can simultaneously allow an observable neutrinoless double beta decay and a vanishing Majorana neutrino mass. In consequence a future discovery of neutrinoless double beta decay cannot fully rule out the poss…
Neutrino Majorana
对马约拉纳的论文"电子和正电子的对称理论“作了简要回顾。讨论了马约拉纳中微子的研究现状。
Distinguishable RGE running effects between Dirac neutrinos and Majorana neutrinos with vanishing Majorana CP-violating phases
在中微子混合的一种新的参数化和$τ$ -轻子优势近似下，我们证明了即使两个Majorana CP破坏相消失，Dirac中微子的单圈重整化群方程也不同于Majorana中微子的单圈重整化群方程.由于后者可以从电弱标度到典型的跷跷板标度保持消失，因此区分Dirac和Majorana情况下中微子混合参数的RGE运行效应是有意义的。在具有相当大的$\tanβ$的最小超对称标准模型中，只要三个中微子的质量接近简并或具有倒置的层次，则差异是相当大的。
Can Neutrinos be Majorana Particles
最近有人声称，观测到的物理中微子不可能是马约拉纳类型的，因为这种粒子缺乏矢量相互作用。与此相反，我们表明，如果马约拉纳中微子是无质量的，它是不可区分的狄拉克中微子，使观察到的物理中微子可能同样是马约拉纳或狄拉克类型。
Majorana neutrino. Is double neutrinoless beta decay possible in the framework of the weak interactions? How to prove that neutrino is Majorana particle
通常认为Majorana中微子产生于叠加态$χ_L = ν_L + (ν_L)^c$，然后经历无中微子双β衰变。但是由于弱相互作用是手征不变性的，因此中微子在产生时具有确定的螺旋性（即，$ν_L$和$(ν_L)^c$中微子分别产生，然后中微子不处于叠加态）。在没有任何外部相互作用的情况下，这种螺旋度在生产后不会改变。因此，我们看到，对于不合适的螺旋度，即使中微子是马约拉纳粒子，也不可能发生无中微子双$β$衰变。此外，由于真空中的螺旋性，Majorana中微子在振荡时向反中微子的跃迁是被禁止的。那么证明中微子是狄拉克粒子而不是马约拉纳粒子的唯一可能性是探测到$ν_L$中微子到（无菌）反中微子$\barν_R$的跃迁（即，$ν_L \to \barν_R$）在中微子振荡。将Majora中微子$ν_L$转变为$(ν_R)^c$（即，由于假定$(ν_R)^c$的质量非常大，因此未观察到振荡时的$ν_L \to (ν_R)^c$）。
Comment on Recent Argument That Neutrinos Are Not Majorana Particles
中微子-电子散射的现有数据并不意味着中微子不是马约拉纳粒子。中微子是马约拉纳性质还是狄拉克性质的问题仍然是完全没有答案的。
Majorana Neutrino Mixing
关于中微子质量小的最合理的解释是基于这样的假设：轻子总数在大尺度上是不符合的，并且具有确定质量的中微子是马约拉纳粒子。本文详细讨论了狄拉克中微子混合与马约拉纳中微子混合的区别以及揭示定质量中微子马约拉纳性质的可能性。
Some Unsettled Questions in the Problem of Neutrino Oscillations. Remarks About the Majorana Neutrino Oscillations
结果表明，我们不能把Majorana中微子在标准狄拉克理论没有违反规范不变性。对$ν_l \to l (l = e, μ, τ)$跃迁的实验不能证实这一假设。这意味着在中微子振荡实验中，马约拉纳中微子振荡是无法观测到的。
Concerning the Differences Between Zero Mass Dirac and Zero Mass Majorana Neutrinos
用两句话证明了马约拉纳中微子和狄拉克中微子（在零质量极限下持续存在）之间的物理差异。
The heavy singlet Majorana neutrinos are introduced to generate the neutrino mass in the so-called phenomenological type-I seesaw mechanism. The phenomena induced by the heavy Majorana neutrinos are important to search for new physics. In this paper, we explore the heavy Majorana neutrino production and decay at future $e^{-}p$ colliders. The corresponding cross sections via $W$ and photon fusion are predicted for different collider energies. Combined with the results of the heavy Majorana neutrino production via single $W$ exchange, this work can provide helpful information to search for heav…
We assume that neutrinoless double beta decay is caused by the exchange of three light Majorana neutrinos. Under this assumption, we obtain, by the method of perturbation, the equation representing the isocontour of effective Majorana mass which is the function of two CP-violating Majorana phases. The equation representing the isocontour (constraint equation between two Majorana phases) is expressed analytically by six parameters: two lepton mixing angles, two kinds of neutrino mass squared differences, lightest neutrino mass scale, and the effective Majorana mass. We discuss how the constrain…
The texture zero mass matrices for the leptons and the seesaw mechanism are used to derive relations between the matrix elements of the lepton mixing matrix and the ratios of the neutrino masses.
Neutrino Mass Matrix from Seesaw Mechanism with Heavy Majorana Neutrino Subject to Texture Zero and Invariant Under a Cyclic Permutation
我们评估了由跷跷板机制产生的中微子质量矩阵的预测能力，其中重Majorana质量矩阵服从纹理零，并满足太阳中微子混合现象的循环置换不变形式。从重Majorana中微子质量矩阵的八种可能的模式中，我们发现没有一个重Majorana中微子质量矩阵在循环置换下是形式不变的。但是，通过对重Majorana中微子质量矩阵逆的2 × 2子矩阵中至少有一个具有零行列式的附加假设，我们发现重Majorana中微子质量矩阵的8种可能模式中只有2种在循环置换下是不变的.两个不变的重Majorana中微子质量矩阵中的一个可以产生中微子质量矩阵$M_ν$，它可以用来定性地解释太阳和大气中微子的中微子混合现象。
Nearly Mass-Degenerate Majorana Neutrinos: Double Beta Decay and Neutrino Oscillations
假设标准模型中微子，无论是从规范的跷跷板机制或从一个重标量三重态的树级马约拉纳质量相等，我讨论了它们的辐射分裂可能是有关的中微子无双β衰变和中微子振荡。
(abridged) The physical mechanisms that make a neutrino with standard-model (SM) weak interactions a "lepton-number conservation (LNC) violating" neutrino such as the Majorana neutrino are analysed in a basis of two Majorana states that have opposite charge-parity ("charge-parity basis"). A small Majorana mass that is larger than any Dirac mass makes the neutrino not a Majorana but a "pseudo-Majorana" particle that has no definite chirality and therefore has a different phenomenology than the physical neutrino. A combination of a large Majorana and Dirac mass of nearly equal value makes the ne…
Constraints on mixing angles of Majorana neutrinos
通过结合输入的中微子双β衰变和适合的宇宙学模型的暗物质与太阳和大气中微子数据，我们得到的两个马约拉纳中微子的混合角的约束，这变得更强时，再加上反应堆中微子数据。如果太阳中微子之谜的小角解成立，这些约束条件足以排除Majorana中微子。
Mass Matrix of Majorana Neutrinos
我们提出了一个大规模的马约拉纳中微子模型，看看它是如何从太阳和大气中微子赤字实验的约束。该模型结合了跷跷板机制和佩西-奎因对称性。讨论了它对无中微子双β衰变的影响。
Toward neutrino texture dominated by Majorana lefthanded mass matrix
本文提出了三个活跃和三个惰性的常规Majorana中微子的混合矩阵的一种形式。它的Majorana左手部分来自于流行的三个活跃中微子的双峰混合矩阵，如果忽略LSND效应，它在太阳和大气实验中的工作令人满意。三个不育中微子之一，有效的马约拉纳右手和狄拉克部分建议的混合矩阵，是负责可能的LSND效应的微扰诱导三个额外的中微子质量状态之一存在积极。导出了中微子质量矩阵的相应形式。如果所有三个额外的中微子质量状态都消失了，中微子质量矩阵由其特定的马约拉纳左手部分主导。然后，中微子和下夸克混合之间观察到的定性差异可能与中微子实现的马约拉纳左手优势有关。
With the help of current neutrino oscillation data, we illustrate the three-dimensional (3D) profiles of all the six distinct effective Majorana neutrino masses $|\langle m\rangle^{}_{αβ}|$ (for $α, β= e, μ, τ$) with respect to the unknown neutrino mass scale and effective Majorana CP phases. Some salient features of $|\langle m\rangle^{}_{αβ}|$ and their phenomenological implications are discussed in both the normal and inverted neutrino mass ordering cases.
The nonzero neutrino mass can be a signal for new physics beyond the standard model. To explain the tiny neutrino mass, we can extend the standard model with right-handed Majorana neutrinos in a low-scale seesaw mechanism, while the CP violation effect can be induced due to the CP phase in the interference of heavy Majorana neutrinos. The existence of heavy Majorana neutrinos may lead to lepton number violation processes, which can be used as a probe to search for the signal of heavy Majorana neutrinos. In this paper, we focus on the CP violation effect related to two generations of heavy Majo…
The tiny neutrino masses can be explained naturally by extending the standard model with right-handed Majorana neutrinos in low-scale seesaw mechanism, and the CP violation effect induced by Majorana phase is interesting and worth studying at colliders. In this paper, we investigate the prospects for measuring CP violation in top quark pair production and rare decay via Majorana neutrinos at the LHC. The CP asymmetry stems from the significant interference of contributions from two different Majorana neutrinos and can be appreciable when the two neutrino masses are nearly-degenerate. It is fou…
Right-handed Majorana Neutrino Mass Matrices for Generating Bimaximal Mixings in Degenerate and Inverted Models of Neutrinos
本文试图从右手Majorana中微子质量矩阵的织构中产生三种中微子的双峰混合。在本文中，我们扩展了我们的早期工作的产生的左手Majorana中微子质量矩阵的近简并以及倒置的层次模型，使用右手Majorana中微子质量矩阵的非对角纹理和狄拉克中微子质量矩阵的对角形式，在跷跷板机制的框架内，在一个模型独立的方式。这样的马约拉纳中微子质量模型是重要的，以解释最近报道的无中微子双拍衰变（0/nu/beta/beta）实验的结果，以及早期建立的数据LMA MSW太阳和大气中微子振荡。
The spin flavor precession (SFP) is investigated in the three neutrino generation case assuming that the neutrinos are Majorana type. Approximate analytical formulas including all transition magnetic moments are provided for the electron neutrino survival probability and electron neutrino -> electron anti-neutrino transition probability in the SFP framework. The accuracy of the formulas is checked out for two different magnetic field profiles in the Sun.
The magic textures are successful candidates of the correct texture for the Majorana neutrinos. In this study, we show that some types of magic texture for Majorana neutrinos approximately immanent in the flavor mass matrix for Dirac neutrinos. In addition, it turned out that the normal mass ordering of the Dirac neutrino masses is slightly preferable to the inverted mass ordering in the context of the magic textures.
We analize the non-cyclic geometric phase for neutrinos. We find that the geometric phase and the total phase associated to the mixing phenomenon provide a tool to distinguish between Dirac and Majorana neutrinos. Our results hold for neutrinos propagating in vacuum and through the matter. Future experiments, based on interferometry, could reveal the nature of neutrinos.
Majorana Neutrinos and Long Range Forces
我们建立了一对马约拉纳中微子的交换介导的力量不同于那些由于狄拉克中微子交换。
Pattern of the Approximate Mass Degeneracy of Majorana Neutrinos
考虑到最近报道的电子中微子的马约拉纳质量不为零的证据，以及大气和太阳中微子振荡的既定现象，三个近质量简并的马约拉纳中微子的情况现在是一个明显的可能性。我在本文中展示了如何在最近提出的$A_4$模型的Majorana中微子质量的对称性破缺的自然模式可以容纳中微子振荡的数据，从而在预测$\sin^2 2 θ_{atm} = 1$和$\sin^2 2 θ_{sol} = 2/3$。
We have investigated a possible connection between the Majorana phases and geometric parameters of leptonic unitarity triangle(LUT) in two-texture zero neutrino mass matrix. Such analytical relations can, also, be obtained for other theoretical models viz. hybrid textures, neutrino mass matrix with vanishing minors and have profound implications for geometric description of $CP$ violation. As an example, we have considered two-texture zero neutrino mass model to obtain relation between Majorana phases and LUT parameters. In particular, we find that Majorana phases depend on only one of the thr…
The see-saw mechanism and heavy Majorana neutrino masses in an SO(10) model
我们应用跷跷板机制和SO（10）模型来计算中微子的质量和混合，以估计重的Majorana质量。本文简要地讨论了重Majorana中微子的衰变模，并计算了它们对轻子数破坏过程μ \to eγ，τ \to μγ和τ \to eγ的贡献。
I analyze a fourth generation lepton sector in which the lightest particle is a stable Majorana neutrino. In this scenario fourth generation neutrinos have both a Dirac and Majorana mass, resulting in two Majorana neutrino mass eigenstates. A reanalysis of LEP's lower mass bound is performed on stable Majorana neutrinos from the Z width and the lower mass bound is loosened. I also extrapolate LEP's SUSY squark search with a 2 jet plus missing missing energy final state to the production and decay of a pair of heavy Majorana neutrinos; here it is expected that significant regions of the neutrin…
The effect of Majorana phase in degenerate neutrinos
当中微子是Majorana费米子时，轻子味混合矩阵中存在物理Majorana相。在两个简并中微子的情况下，物理Majorana相位对第二代和第三代之间的最大味道混合的稳定性起着至关重要的作用。$π$的物理Majorana相保证了最大混合对量子修正是稳定的，而零的Majorana相使最大混合在中微子质量为O（eV）时被量子修正破坏。Majorana相从$π$到0的连续变化使得最大混合被O（eV）简并中微子质量的量子修正破坏。另一方面，当中微子之间存在大质量等级时，最大味混合不受独立于Majorana相位的量子修正的影响。
We demonstrate that Majorana neutrinos can form Cooper pairs due to long-range attractive forces and show BCS superfluidity in a class of mass varying neutrino dark energy models. We describe the condensates for Majorana neutrinos and estimate the value of the gap, critical temperature and Pippard coherence length for a simple neutrino dark energy model. In the strong coupling regime bosonic degree of freedom can become important and Bose-Einstein condensate may govern the dynamics for the mass varying neutrino models. Formation of the condensates can significantly alter the instability scenar…
Neutrinoless double beta decay (NDBD) is the only experiment that could probe the Majorana nature of the neutrino. Here we study the theoretical implications of NDBD for models yielding tri-bimaximal lepton mixing like A4 and S4.
FCNC, CP violation, and impure Majorana neutrinos
本文在一般情况下讨论了具有Majorana和Dirac质量的中微子质量矩阵的树级对角化。在这样的模型中，口味改变中性电流是不可避免的。确定了表征FCNC费米子-希格斯相互作用中CP破坏的重定相不变量。在单圈水平，质量本征态成为一个不纯的马约拉纳型。以两种中微子为例，探讨了左手中微子的质谱发生显著变化的可能性。本文还讨论了不纯Majorana中微子的中微子振荡。
The analysis of the total and geometric phases generated by the neutrino oscillation shows that these phases for Majorana neutrinos are depending on the representation of the mixing matrix and they are different from those of Dirac neutrinos.
We explain why it is so hard to determine whether neutrinos are Majorana or Dirac particles as long as the only neutrinos we study are ultra-relativistic. We then show how non-relativistic neutrinos could help, and focus on the angular distributions in the decays of an as-yet-to-be-discovered heavy neutrino $N$. We find that these angular distributions could very well tell us whether neutrinos are Majorana or Dirac particles.
Renormalization of Lepton Mixing for Majorana Neutrinos
讨论了Majorana中微子情况下轻子混合矩阵的单圈电弱重整化，并建立了它与负责轻Majorana中微子质量的五维算符的重整化群演化的关系.我们比较我们的结果在有效的理论与那些在充分的跷跷板理论。
Low-Energy Neutrino Majorana Phases and Charged-Lepton Electric Dipole Moments
如果中微子是马约拉纳费米子，至少有三个新的，潜在的可观察到的CP奇相位，参数CP不变性违反现象。我们目前还没有关于它们中任何一个的信息，并且知道三个中的两个，即所谓的马约拉纳阶段，很难通过实验获得。在这里，我们讨论的荷电轻子电偶极矩（EDM）的Majorana阶段的效果，并明确表明，中微子Majorana阶段诱导EDM即使在没有其他来源的CP不变性违反。我们还认为，虽然马约拉纳中微子的贡献是微小的，有一个通用的紫外线完成的标准模型加上大量的马约拉纳中微子-标准模型加上一个三重态希格斯玻色子-导致显着增强的贡献，仍然是成比例的低能量中微子马约拉纳阶段。如果这种特殊的情况在自然界中得以实现，那么至少在原则上，通过精确测量带电轻子EDM来测量马约拉纳相似乎是可能的。
Neutrinos are the only known elementary fermions that can exhibit Majorana nature. As per the "practical Dirac-Majorana confusion theorem" it is impossible to distinguish between Dirac and Majorana neutrinos via any kinematic tests when their masses are very small. However, it is also well known that Majorana neutrino and anti-neutrino present in the final state must obey the Fermi-Dirac statistics, irrespective of how small the mass of neutrino is. We propose a new method to search for Majorana neutrinos by exploiting their quantum statistical property. We analyse `effective' three-body decay…
Are neutrinos with definite masses Majorana or Dirac particles? This is one of the most fundamental problem of the modern neutrino physics. The solution of this problem could be crucial for understanding of the origin of small neutrino masses. We will review here basic arguments in favor of the Majorana nature of massive neutrinos. The phenomenological theory of $0νββ$-decay is briefly discussed and recent experimental data and sensitivity of future experiments are presented.
A note on Majorana neutrinos, leptonic CKM and electron electric dipole moment
在中微子质量为零的标准模型中，电子的电偶极矩$d_e$最多可消失三个e环。然而，如果中微子是有质量的Majorana粒子，我们得到轻子CKM机制诱导的$d_e$在两圈级不为零的结果，并且它适用于所有的有质量的Majorana中微子模型.
We study the $B_C$ meson rare decay in order to search for the Majorana neutrino signal. It is found that the the corresponding decay rate is sensitive to the Majorana neutrino mass and mixing angles. The signal of $B_C^\pm\to l_1^\pm l_2^\pm M^\mp $ induced by the Majorana neutrino within the mass region $m_π<m_n<m_B$ may be observed at LHCb.
Can we distinguish Majorana and Dirac neutrinos in solar neutrino experiments ?
如果太阳内部的中微子转换导致初始太阳中微子通量的部分极化，那么通过测量太阳中微子探测器中的微分$ν_ee$散射截面来区分Majorana和Dirac中微子的新机会就出现了。HELLAZ等实验在测试Majorana和Dirac中微子引发的反冲电子谱差异方面将是优选的，因为可以检测到低能反冲电子（$T\geq 100 keV$），并且可以以良好的精度确定电子能量和方向。
Neutrino texture dominated by Majorana lefthanded mass matrix
本文提出了三个活跃和三个惰性的常规Majorana中微子的混合矩阵的一种形式。它的Majorana左手部分来自于流行的三个活跃中微子的双峰混合矩阵，如果忽略LSND效应，它在太阳和大气实验中的工作令人满意。三个不育中微子中的一个，在建议的混合矩阵的马约拉纳右手和狄拉克部分有效，是负责可能的LSND效应诱导三个额外的中微子质量状态之一存在积极。导出了中微子质量矩阵的相应形式。此外，还计算了相应的中微子振荡几率。
Impact of right-handed interactions on the propagation of Dirac and Majorana neutrinos in matter
在相对论性中微子振荡中，由于狄拉克中微子和马约拉纳中微子在物质中的传播方式不同，如果存在新的右手相互作用，则可以区分这两种中微子。我们回顾了这些新的相互作用如何影响中微子振荡实验，并讨论了不同的振荡通道，基线和中微子能量最终观察到的效果的大小。
After introducing a master formula for the Majorana neutrino mass matrix we present a master parametrization for the Yukawa matrices automatically in agreement with neutrino oscillation data. This parametrization can be used for any model that induces Majorana neutrino masses. The application of the master parametrization is also illustrated in an example model, with special focus on its lepton flavor violating phenomenology.
It is well known that Majorana neutrinos have a pure axial neutral current interaction while Dirac neutrinos have the standard vector-axial interaction. In spite of this crucial difference, usually Dirac neutrino processes differ from Majorana processes by a term proportional to the neutrino mass, resulting in almost unmeasurable observations of this difference. In the present work we show that once the neutrino polarization evolution is considered, there are clear differences between Dirac and Majorana scattering on electrons. The change of polarization can be achieved in astrophysical enviro…
The phenomenology of flavor mixing of heavy Majorana neutrinos is studied. The physical degrees of freedom, which propagate like free particles until they decay in the presence of flavor mixing, are identified by diagonalizing the resummed propagator. It is shown that they should be interpreted as quasiparticles which lose Majorana nature.
Matter effects on Majorana neutrino phases
我们考虑环境物质对中微子Majorana相的影响。我们发现，这可以导致一个可观察到的信号，如果中微子振荡实验可以进行的源和检测器是在适当不同的物质密度。我们说明的情况下，使用β束中微子源作为一个例子，并表明，5西格玛信号的物质修改的马约拉纳阶段可能在5年的运行。
CP violation in lepton-number-conserving processes through heavy Majorana neutrinos at future lepton colliders
本文研究未来轻子对撞机上通过重马约拉纳中微子的轻子数守恒过程中的CP破坏，指出其新观测可为超出标准模型的新物理提供证据。
Electroweak Baryogenesis and Constraints on Left-handed Majorana Neutrino Masses
在弱电相变中，轻Majorana中微子产生的轻子数违反相互作用可以消除宇宙的原始重子不对称性。左手中微子的马约拉纳质量被限制以避免这个问题。这些约束不依赖于$(B-L)$对称性破缺机制。
Connection Between the Neutrino Seesaw Mechanism and Properties of the Majorana Neutrino Mass Matrix
如果能在实验上确定3X3马约拉纳中微子质量矩阵M_nu的一个或多个2X2子矩阵的行列式为零，则可以解释为理论上著名的正则跷跷板机制的支持证据。我展示了这两件事是如何联系在一起的，并提供了一个现实的M_nu与两个零子行列式作为一个例子。
On the possibility of distinguishing between Majorana and Dirac neutrinos
我们澄清，一个不能区分Majorana和狄拉克中微子的极限消失的中微子质量。特别地，我们证明了反应e^+ e^-> νν中的前后不对称性对于ν_M和ν_D是相同的，这与最近文献中的说法相反。
Leptonic CP violation is one of the most important topics in neutrino physics. CP violation in the neutrino sector is strongly related to the nature of neutrinos: whether they are Dirac or Majorana particles. In \cite{Popov:2021icg} we have shown that for Majorana neutrinos arance of nonzero Majorana CP-violating phases combined with strong magnetic field during supernova core-collaple can induce new resonances in neutrino oscillations, for example in $ν_e \to \barν_τ$ channel. In this contribution we further study new resonances in Majorana neutrino oscillations, in particular energy dependen…
Lepton number violation processes can be induced by the Majorana neutrino exchange, which provide evidence for the Majorana nature of neutrinos. In addition to the natural explanation of the small neutrino masses, Type-I seesaw mechanism predicts the existence of Majorana neutrinos. The aim of this work is to study the B meson rare decays $B^{+} \to K^{(*)+}μ^+μ^-$ in the standard model and its extensions, and then to investigate the same-sign decay processes $B^{+}\to K^{(*)-}μ^{+}μ^+$. The corresponding dilepton invariant mass distributions are predicted. It is found that the dilepton angula…
The article investigates the possibility that right-handed neutrinos are Majorana particles embedded in an abelian multiplicative $U(1)_R$ factor, with the Lagrangian in the new factor being invariant under chiral gauge transformations. Majorana neutrinos couple to charged and neutral currents, producing new signatures to (anti)neutrino-electron elastic scattering and an additional term to coherent scattering of neutrinos on atomic nuclei. The model is ultraviolet complete and depends on one extra hypercharge correlating the reactions and providing upper bounds for the new coupling constant.
Phenomenological analysis of properties of the RH Majorana neutrino in the seesaw mechanism
作为我们以前在跷跷板机制中工作的一个扩展，我们分析了$U_{e3}$对RH Majorana中微子在三种味道中的性质（质量和混合）的影响。还考虑了准生轻中微子的情况。假设狄拉克中微子质量是分级的，我们发现当$θ_{23}^ν$较大时，重Majorana中微子的质量谱是分级的或部分简并的。我们发现，简并RH Majorana质量对应于最大的RH混合角，而层次的对应的RH混合角的比例线性狄拉克中微子质量的质量比。一个有趣的类似物的行为的物质增强中微子转换。
The probability distribution for the effective Majorana mass as a function of the lightest neutrino mass in the standard three neutrino scheme is computed via a random sampling from the distributions of the involved mixing angles and squared mass diffences. A flat distribution in the [0,2pi] range for the Majorana phases is assumed, and the dependence of small values of the effective mass on the Majorana phases is highlighted. The study is then extended with the addition of the cosmological bound on the sum of the neutrino masses. Finally, the prospects for neutrinoless double beta decay searc…
In the Standard Model minimally extended to include massive neutrinos, we compute the leading CP-violating zero temperature contributions to the one-loop effective action induced by integration of the leptons. Such contributions start at operators of dimension six and they are P even for Dirac neutrinos and P even or odd for Majorana neutrinos. Dimension four operators are allowed in the mixed Dirac-Majorana case. It is verified by explicit calculation that CP can be violated in two generation settings for Majorana neutrinos. Using different neutrino scenarios we give upper bounds for the coup…
On the Possibilities of Distinguishing Majorana from Dirac Neutrinos
包含有质量的狄拉克中微子或马约拉纳中微子的截面，通常只有因中微子质量小而被抑制的项不同。然而，过程$e^+e^-\toνν$是一个例子，其中两个微分截面即使在极限$m_ν\to 0$中只要$m_ν\not=0$就相当不同。我讨论了这种现象的原因，并评论的战略，以确定不同的马约拉纳和狄拉克中微子信号的过程。
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