Absolute neutrino mass and the Dirac/Majorana distinction from the weak interaction of aggregate matter

任意维度与号型下的狄拉克、马约拉纳与外尔旋量

Dirac, Majorana, and Weyl Spinors in Arbitrary Dimension and Signature

本文针对任意维度与号型，通过分别处理实克利福德代数及其偶子代数，给出明确约定的费米子场分类方法，确定各周期性扇区下的各类旋量场，区分不变配对与相关约束，完善了旋量结构的系统分类。

利用旋量-螺旋度技术探索狄拉克与马约拉纳中微子的量子统计

Exploring Quantum Statistics for Dirac and Majorana Neutrinos using Spinor-Helicity techniques

本文用旋量-螺旋度方法计算轻标量衰变至两中微子与两轻子的全部螺旋度振幅，证明在正确反称化与求和下，狄拉克-马约拉纳混淆定理成立。

在FASER中区分狄拉克和马约拉纳中微子

Distinguishing between Dirac and Majorana neutrinos at FASER

FASER实验利用SMNEFT预测的信号，通过分析电子-正电子对的空间分布，区分狄拉克和马约拉纳右旋中微子。

非相对论性中微子与狄拉克型与马约拉纳型中微子性质之问

Non-relativistic neutrinos and the question of Dirac vs. Majorana neutrino nature

本文详细探讨了在非相对论性条件下区分狄拉克型与马约拉纳型中微子的可行性，分析了β衰变、遗迹中微子及散射等过程中的探测可能。

无真空马约拉纳中微子质量的中微子less双贝塔衰变

Neutrinoless Double Beta Decay without Vacuum Majorana Neutrino Mass

本文提出一种标准模型扩展，通过捕获携带两个轻子数单位的超轻标量暗物质诱发中微子less双贝塔衰变，证明该过程无需中微子为马约拉纳粒子，并讨论了与标量发射情形的实验可区分性。

Survey of Texture Zeros with Light Dirac Neutrinos

We classify all possible texture zeros in light neutrino mass matrix in diagonal charged lepton basis by considering Dirac nature of light neutrinos. For Hermitian nature of neutrino mass matrix, the number of possible texture zeros remain same as Majorana texture zeros, but with less free parameters due to the absence of additional Majorana CP phases. Relaxing the Hermitian nature of neutrino mass matrix lead to many more possibilities and freedom due to additional CP phases, mixing angles not constrained by neutrino data. While we find that none of the texture zeros in Hermitian case are all…

宇宙学观测中中微子种类数与质量和测量的意义

Implications of neutrino species number and summed mass measurements in cosmological observations

本研究将早期宇宙的中微子自由度与质量和与BSM粒子物理对峙，发现Majorana型中微子被Planck观测接受，Dirac型在受限模型中亦可存活，改进的测量精度有助于确定质量排序与超对称能标。

Neutrino elastic scattering on polarized electrons as a tool for probing the neutrino nature

Possibility of using the polarized electron target (PET) for testing the neutrino nature is considered. One assumes that the incoming electron neutrino ($ν_e$) beam is the superposition of left chiral states with right chiral ones. Consequently the non-vanishing transversal components of $ν_e$ spin polarization may appear, both T-even and T-odd. $ν_e$s are produced by the low energy monochromatic (un)polarized emitter located at a near distance from the hypothetical detector which is able to measure both the azimuthal angle and polar angle of the recoil electrons, and/or also the energy of the…

I$_{2}$ molecule for neutrino mass spectroscopy: ab initio calculation of spectral rate

It has recently been argued that atoms and molecules may become good targets of determining neutrino parameters still undetermined, if atomic/molecular process is enhanced by a new kind of coherence. We compute photon energy spectrum rate arising from coherent radiative neutrino pair emission processes of metastable excited states of I$_2$ and its iso-valent molecules, $|Av \rangle \rightarrow |Xv' \rangle + γ+ ν_iν_j$ and $|A'v \rangle \rightarrow |Xv' \rangle + γ+ ν_iν_j$ with $γ$ an IR photon and $ν_{i(j)}$ $i(j)-$th neutrino mass eigenstates, and show how fundamental neutrino parameters ma…

Neutrino Mass Matrices with $M_{ee} = 0$

Motivated by the possibility that the amplitude for neutrinoless double beta decay may be much smaller than the planned sensitivity of future experiments, we study ansatze for the neutrino mass matrix with $M_{ee} = 0$. For the case in which CP is conserved, we consider two classes of real-valued mass matrices: "Class I" defined by $|M_{eμ}| = |M_{eτ}|$, and "Class II" defined by $|M_{μμ}| = |M_{ττ}|$. The important phenomenological distinction between the two is that Class I permits only "small" values of $V_{e3}$ up to $\sim 0.03$, while Class II admits "large" values of $V_{e3}$ up to its e…

Neutrino mass spectroscopy using Er$^{3+}$ ions placed at inversion center of host crystals

We propose neutrino mass spectroscopy using Er$^{3+}$:Cs$_2$NaYF$_6$ or :Y$_2$O$_3$ crystal placed in hollow of a Bragg fiber as a target system. Unknown neutrino parameters and properties such as the lightest neutrino mass, Majorana/Dirac distinction, and CP violating phases can be explored by measuring scattered photons ($γ$) along the excitation (and fiber) axis by varying Raman trigger ($γ_0$) directions, in Er$^{3+}$ de-excitation process from $|e\rangle $ state to $|g\rangle $ state; $|e\rangle \,, | e\rangle + γ_0 \rightarrow | g\rangle + γ+ ν_i\barν_j$, $ν_i\,, i = 1, 2,3$ being a mass…

Parity violation in radiative emission of neutrino pair from metastable states of heavy alkaline earth atoms

Macro-coherent atomic de-excitation involving a neutrino pair emission, radiative emission of neutrino pair (RENP) $|e\rangle \rightarrow |g\rangle + γ+ν_i ν_j$ (with $γ$ a photon and $ν_i$ a neutrino mass eigenstate), is a new experimental tool to determine undetermined neutrino parameters such as the smallest neutrino mass and distinction of Majorana and Dirac neutrinos. The best way to prove that the atomic RENP process accompanied by unseen neutrino pair involves weak interaction is to measure parity violating (PV) quantities. We quantitatively study how this is achieved. The basic mechani…

通过原子钟干涉中中微子的媒介作用研究中微子质量与性质

Neutrino mass and nature through its mediation in atomic clock interference

提出利用原子钟干涉仪探测微米尺度中微子对介导势，以区分 Dirac 与 Majorana 中微子并测量其质量，同时讨论抑制 Casimir-Polder 力和补偿引力的方案。