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arXiv 1209.3891hep-ph
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低尺度跷跷板情形下的中微子暗物质

Sneutrino Dark Matter in Low-scale Seesaw Scenarios

Valentina De Romeri, Martin Hirsch

摘要:

我们考虑超对称模型,其中sneutrinos是可行的暗物质候选者。这些都是最小超对称标准模型的简单扩展,增加了额外的单重超场,如逆或线性跷跷板,或者是一个额外的U(1)群模型。所有这些模型都能容纳观测到的小中微子质量和大的混合。我们调查的性质,sneutrinos的暗物质候选人在这些情况下。我们检查现象学的界限,如正确的遗物丰度,直接检测截面限制和实验室的限制,除其他外轻子味违反(LFV)收费轻子衰变的一致性。虽然反向和线性跷跷板导致LFV的不同结果,但两种模型都具有非常相似的暗物质现象,与所有实验边界一致。由于额外的规范玻色子Z'和额外的轻希格斯玻色子的存在,扩展规范模型显示出一些额外的和特殊的特征。具体地说,我们指出,对于sneutrino LSP有一个强大的约束的Z'的质量,由于直接探测散射截面的实验界限。

英文摘要:

We consider supersymmetric models in which sneutrinos are viable dark matter candidates. These are either simple extensions of the Minimal Supersymmetric Standard Model with additional singlet superfields, such as the inverse or linear seesaw, or a model with an additional U(1) group. All of these models can accomodate the observed small neutrino masses and large mixings. We investigate the properties of sneutrinos as dark matter candidates in these scenarios. We check for phenomenological bounds, such as correct relic abundance, consistency with direct detection cross section limits and laboratory constraints, among others lepton flavour violating (LFV) charged lepton decays. While inverse and linear seesaw lead to different results for LFV, both models have very similar dark matter phenomenology, consistent with all experimental bounds. The extended gauge model shows some additional and peculiar features due to the presence of an extra gauge boson Z' and an additional light Higgs. Specifically, we point out that for sneutrino LSPs there is a strong constraint on the mass of the Z' due to the experimental bounds on the direct detecton scattering cross section.

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