Neutrinos vis-a-vis the six-dimensional standard model
Neutrinos vis-a-vis the six-dimensional standard model
复制标题
中微子与六维标准模型
DOI：
10.1103/physrevd.65.105019
复制
发表时间：
2002
影响因子：
5
通讯作者：
Ho
中科院分区：
文献类型：
--
作者：
T. Appelquist;B. Dobrescu;E. Pontón;Ho
在六维标准模型的背景下，我们研究了中微子质量和振荡的起源。这个模型的时空对称性解释了质子的稳定性，并禁止马约拉纳中微子质量。六维理论的一致性需要三个右手中微子，因此狄拉克中微子质量是允许的。我们采用的想法，这些质量的小是由于右手中微子在第七，扭曲的维度传播。我们认为，这类理论是免费的引力异常。尽管中微子质量和电弱标度之间存在指数层次结构，但我们发现三个中微子质量之间的质量层次结构受到高维算子的限制。目前所有的中微子振荡数据，除了LSND的结果，自然容纳我们的模型。在太阳中微子的情况下，该模型导致大混合角，MSW解决方案。所采用的机制，涉及三个右手中微子耦合到一个额外的维度标量，可以解释中微子光谱的特点，在一个更一般的理论，禁止马约拉纳质量。
We examine the origin of neutrino masses and oscillations in the context of the six-dimensional standard model. The space-time symmetries of this model explain proton stability and forbid Majorana neutrino masses. The consistency of the six-dimensional theory requires three right-handed neutrinos, and therefore Dirac neutrino masses are allowed. We employ the idea that the smallness of these masses is due to the propagation of the right-handed neutrinos in a seventh, warped dimension. We argue that this class of theories is free of gravitational anomalies. Although an exponential hierarchy arises between the neutrino masses and the electroweak scale, we find that the mass hierarchy among the three neutrino masses is limited by higher-dimension operators. All current neutrino oscillation data, except for the LSND result, are naturally accommodated by our model. In the case of the solar neutrinos, the model leads to the large mixing angle, MSW solution. The mechanism employed, involving three right-handed neutrinos coupled to a scalar in an extra dimension, may explain the features of the neutrino spectrum in a more general class of theories that forbid Majorana masses.