Neutrino Mass and Proton Decay in a U(1)R Symmetric Model
Neutrino Mass and Proton Decay in a U(1)R Symmetric Model
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U(1)R 对称模型中的中微子质量和质子衰变
DOI：
10.1093/ptep/ptt016
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
T. Shimomura
中科院分区：
文献类型：
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作者：
Y. Morita;H. Nakano;T. Shimomura
研究了在可见扇区和隐扇区中具有超对称破缺的超对称标准模型Au（1）R-对称扩展。特别地，我们研究了由引力子质量参数化的U（1）R-破缺效应。右手中微子的特殊R-电荷分配使得中微子与带R-电荷的Higgs场之间存在Yukawa耦合，这在U（1）R-对称性破缺后产生了极小的真空期望值。即使在O（1）Yukawa耦合下，只要引力子质量很小，m ~ 3/2= 1-10 eV，也能产生适当大小的Dirac中微子质量。我们的flippedR-电荷分配也允许一种新型的五维算子，可以诱导质子衰变。事实证明，质子的稳定性温和地限制了引力子质量的允许范围：一个重于10 keV的引力子可以逃避质子衰变的限制以及宇宙学的限制。在这种情况下，最大的中微子汤川耦合与电子汤川耦合相当。我们还计算了赝goldstino的质量及其与中性伴子的混合，并简要讨论了它在宇宙学和希格斯现象学中的意义。
We study aU(1)R-symmetric extension of the supersymmetric standard model with supersymmetry breaking in the visible as well as hidden sectors. Specifically, we studyU(1)R-breaking effects parameterized by the gravitino mass. A specialR-charge assignment of right-handed neutrinos allows us to have neutrino Yukawa couplings with theR-charged Higgs field, which develops a tiny vacuum expectation value after the inclusion ofU(1)R-symmetry breaking. Even withO(1) Yukawa couplings, a suitable size of Dirac neutrino mass can be generated if the gravitino mass is very small,m3/2= 1–10 eV. Our flippedR-charge assignment also allows a new type of dimension-five operator that can induce proton decay. It turns out that the proton stability mildly constrains the allowed range of the gravitino mass: A gravitino heavier than 10 keV can evade the proton decay constraint as well as cosmological ones. In this case, the largest neutrino Yukawa coupling is comparable to the electron Yukawa. We also calculate the mass of the pseudo goldstino and its mixing with neutralinos, and briefly discuss its implications in cosmology and Higgs phenomenology.