Neutrino Masses from Neutral Top Partners
Neutrino Masses from Neutral Top Partners
复制标题
来自中性顶级合作伙伴的中微子质量
DOI：
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
M. McCullough
中科院分区：
文献类型：
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作者：
B. Batell;M. McCullough
我们提出了“自然中微子”理论，其中中性费米子顶伴子场同时是右手中微子（RHN），将标准模型结构中看似不同的方面联系起来：(a) RHN顶级伙伴负责观测到的小中微子质量，(b)它们有助于改善弱尺度的调谐并解决小层次问题，(c)上环希格斯质量修正中Nc产生的3倍因子被RHN的向量代数抵消了3倍因子。RHN的顶级伴子可能出现在伪南布-戈德斯通-玻色子希格斯模型中，如双希格斯，以及更一般的复合希格斯、小希格斯和轨道希格斯模型中，并给出了三个简单的例子模型。这个框架坚定地预测了一个TeV尺度的跷跷板，因为RHN的质量被自然限制在TeV尺度以下。轻中微子质量的产生依赖于轻子数的集体破缺，允许相对较大的中微子汤川耦合和丰富的相关现象。中微子质量机制的结构在一定限度内实现了逆类或线性类跷跷板。自然中微子模型可以在当前和未来的各种实验中进行测试，特别是在轻子普适性测试、轻子味违逆搜索以及高能e+e-和强子对撞机上可能进行的精确电弱和希格斯耦合测量中。
We present theories of “natural neutrinos” in which neutral fermionic top partner fields are simultaneously the right-handed neutrinos (RHN), linking seemingly disparate aspects of the Standard Model structure: (a) The RHN top partners are responsible for the observed small neutrino masses, (b) they help ameliorate the tuning in the weak scale and address the little hierarchy problem, and (c) the factor of 3 arising from Nc in the top-loop Higgs mass corrections is countered by a factor of 3 from the number of vectorlike generations of RHN. The RHN top partners may arise in pseudo-Nambu-Goldstone-Boson Higgs models such as the twin Higgs, as well as more general composite, little, and orbifold Higgs scenarios, and three simple example models are presented. This framework firmly predicts a TeV-scale seesaw, as the RHN masses are bounded to be below the TeV scale by naturalness. The generation of light neutrino masses relies on a collective breaking of the lepton number, allowing for comparatively large neutrino Yukawa couplings and a rich associated phenomenology. The structure of the neutrino mass mechanism realizes in certain limits the inverse or linear classes of seesaw. Natural neutrino models are testable at a variety of current and future experiments, particularly in tests of lepton universality, searches for lepton flavor violation, and precision electroweak and Higgs coupling measurements possible at high energy e+e- and hadron colliders.