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arXiv 1111.1789hep-phhep-ex
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具有右手Majorana中微子暗物质的TeV尺度超对称极小B-L模型

Supersymmetric minimal B-L model at the TeV scale with right-handed Majorana neutrino dark matter

Zachary M. Burell, Nobuchika Okada

摘要:

我们提出了一个超对称扩展的最小$B-L$模型,我们考虑了一个新的$Z_2$ -宇称下,一个右手中微子被分配奇宇称。当$Z_2$ -偶数右手中微子的Majorana Yukawa耦合很大时,辐射修正将使相应右手微中子的质量平方变为负值,从而以自然的方式打破TeV尺度下的$B-L$规范对称性。此外,R宇称被打破,因此传统的超对称暗物质候选者,中性伴子,不再可行。由于$Z_2$ -宇称,$Z_2$ -奇右手中微子即使在R-宇称破坏的情况下也仍然是稳定的暗物质候选者。我们证明了$B-L$规范玻色子(Z ')共振增强湮灭截面的暗物质遗迹丰度与目前的观测结果是一致的。因此,可以推断这个暗物质粒子的质量接近Z'玻色子质量的一半。如果Z'玻色子在大型强子对撞机上被发现,它将引发对暗物质的新探测:观测到的Z'玻色子质量将描绘出一个狭窄的允许暗物质质量范围。如果Z'玻色子衰变为一对暗物质粒子,精确测量看不见的衰变宽度就可以揭示暗物质粒子的存在。

英文摘要:

We propose a supersymmetric extension of the minimal $B-L$ model where we consider a new $Z_2$-parity under which one right-handed neutrino is assigned odd parity. When the Majorana Yukawa coupling of a $Z_2$-even right-handed neutrino is large, radiative corrections will drive the mass squared of the corresponding right-handed sneutrino to negative values, breaking the $B-L$ gauge symmetry at the TeV scale in a natural way. Additionally, R-parity is broken and thus the conventional supersymmetric dark matter candidate, the neutralino, is no longer viable. Thanks to the $Z_2$-parity, the $Z_2$-odd right-handed neutrino remains a stable dark matter candidate even in the presence of R-parity violation. We demonstrate that the dark matter relic abundance with an enhanced annihilation cross section by the $B-L$ gauge boson (Z') resonance is in accord with the current observations. Therefore, it follows that the mass of this dark matter particle is close to half of the Z' boson mass. If the Z' boson is discovered at the Large Hadron Collider, it will give rise to novel probes of dark matter: The observed Z' boson mass will delineate a narrow range of allowed dark matter mass. If the Z' boson decays to a pair of dark matter particles, a precise measurement of the invisible decay width can reveal the existence of the dark matter particle.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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