The Casas-Ibarra (CI) parametrization of the Yukawa coupling matrix of Majorana neutrinos is generalized by considering the exact seesaw relation and including non-unitarity of the $3 \times 3$ Pontecorvo-Maki-Nakagawa-Sakata (PMNS) flavor mixing matrix. With the help of a full $6 \times 6$ Euler-like block description of the flavor structure for the seesaw mechanism, we find that the orthogonal matrix $\mathbb{O}$ in the CI parametrization can be expressed as $\mathbb{O}^{}_{ij} = \sqrt{M^{}_j/m^{}_i} \hspace{0.05cm} F^{}_{ij}$ with $m^{}_i$ and $M^{}_j$ being the masses of light and heavy Majorana neutrinos and $F^{}_{ij}$ consisting of the PMNS and active-sterile flavor mixing parameters (for $i, j = 1, 2, 3$). Assuming a specific pattern of $\mathbb{O}$ is therefore equivalent to imposing some special conditions on the seesaw parameter space.
Generalised Casas-Ibarra Parametrisation for Majorana Neutrino Masses
Instituto de Física Corpuscular (CSIC-Universitat de València)(粒子物理研究所(西班牙科学研究中心-瓦伦西亚大学));Departament de Física Teòrica, Universitat de València(瓦伦西亚大学理论物理系);Universidad Nacional de Córdoba (UNC). Observatorio Astronómico de Córdoba (OAC)(科尔多瓦国立大学科尔多瓦天文台);Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Instituto de Astronomía Teórica y Experimental (IATE)(国家科学研究委员会理论与实验天体物理研究所);Department of Physics, Carleton University(卡尔顿大学物理系)
Insights into 1-loop corrections to neutrino low-scale type-I seesaw mechanism
Università degli studi di Napoli “Federico II”(那不勒斯费德里科二世大学);INFN - Sezione di Napoli(意大利国家核物理研究所那不勒斯分部);Universidad Nacional Autónoma de México(墨西哥国立自治大学)
Ultraviolet Flavor Transmission to T-Violating Neutrino Oscillation Observables in a Seesaw Framework with Sterile Mixing and Planck-Suppressed Corrections
Department of Physics, Kirori Mal College, University of Delhi(德里大学科里尔马尔学院物理系);Department of Physics, Chaudhary Charan Singh University(乔杜里·查兰·辛格大学物理系)
Active-sterile neutrino mixing in the ISS(p,q) inverse seesaw models
Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University(斯寇别尔钦核物理研究所,莫斯科国立罗蒙诺索夫大学);Physics Department, Lomonosov Moscow State University(物理系,莫斯科国立罗蒙诺索夫大学)
A neutrino mass model with hidden $U(1)$ gauge symmetry
我们提出了一个由隐藏的$U(1)$规范对称性控制的反跷跷板模型的实现,并讨论了通过施加$Z_2$宇称对玻色暗物质候选者的影响.我们给出了标量谱的细节,并应用Casas-Ibarra参数化方法对中微子振荡数据进行了拟合。对于该模型,提取允许区域来解释观测到的遗迹密度和μ子$g-2$差异,满足包含DM的味约束。我们将DM湮灭解释为包含所有SM带电费米子的$\bar f f $,并研究了直接探测DM-Higgs耦合的束缚。最后,根据带电轻子对签名加上丢失的横能量,探讨了LHC DM产生。
Dirac-Phase CP-Violation in the Low-Scale Type-I Seesaw with Three Right-Handed Neutrinos
Instituto de Física Corpuscular (IFIC), CSIC-Universitat de València(粒子物理与辐射化学研究所(IFIC),西班牙科学研究中心-巴伦西亚大学);Institute for Theoretical Physics Amsterdam and Delta Institute for Theoretical Physics, University of Amsterdam(阿姆斯特丹理论物理研究所与德尔塔理论物理研究所,阿姆斯特丹大学);Nikhef, Theory Group(荷兰国家核子与亚原子物理研究所,理论组);University of Zagreb, Faculty of Science, Department of Physics(萨格勒布大学理学院物理系);INFN/SISSA(意大利国家核物理研究所/国际高等研究学院);Kavli IPMU (WPI), UTIAS, University of Tokyo(卡弗里宇宙物理学起源研究所(世界顶尖科学中心),东京大学宇宙线研究所);Institute of Nuclear Research and Nuclear Energy, Bulgarian Academy of Sciences(保加利亚科学院核研究与核能研究所)