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arXiv 1111.2361hep-ph
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小宇宙学常数下R对称破缺引起的小中微子质量

Small neutrino masses due to R-symmetry breaking for a small cosmological constant

Rhys Davies, Matthew McCullough

摘要:

我们描述了一类超对称模型,其中中微子保持轻的R-对称性。在超引力中,R对称性必须破缺,才能在超对称性破缺后有一个小的宇宙学常数。在这里描述的模型中,这种R对称破缺导致狄拉克中微子质量的产生,将宇宙学常数的调整与中微子质量之谜联系起来。令人惊讶的是,在低尺度超对称性破缺和超伴体质量接近TeV的假设下,这些质量与基本超对称性破缺尺度无关,并容纳正确的量值。这为中微子和带电费米子质量的巨大差异提供了一个新的解释。这些模型要求R对称超对称存在于TeV尺度,并预言中微子质量是纯粹的狄拉克,这意味着不存在无中微子的双β衰变。有趣的对撞机信号可能是由于带电标量轻子衰变而产生的,其分支比由中微子混合矩阵决定。

英文摘要:

We describe a class of supersymmetric models in which neutrinos are kept light by an R-symmetry. In supergravity, R-symmetry must be broken to allow for a small cosmological constant after supersymmetry breaking. In the class of models described here, this R-symmetry breaking results in the generation of Dirac neutrino masses, connecting the tuning of the cosmological constant to the puzzle of neutrino masses. Surprisingly, under the assumption of low-scale supersymmetry breaking and superpartner masses close to a TeV, these masses are independent of the fundamental supersymmetry-breaking scale, and accommodate the correct magnitude. This offers a novel explanation for the vastly different scales of neutrino and charged fermion masses. These models require that R-symmetric supersymmetry exists at the TeV scale, and predict that neutrino masses are purely Dirac, implying the absence of neutrino-less double beta-decay. Interesting collider signals can arise due to charged scalars which decay leptonically, with branching ratios determined by the neutrino mixing matrix.

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