Realization of sneutrino self-interacting dark matter in the focus point supersymmetry
Realization of sneutrino self-interacting dark matter in the focus point supersymmetry
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DOI：
10.1103/physrevd.98.035007
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发表时间：
2018-04
影响因子：
5
通讯作者：
B. Zhu;Ran Ding;Ying Li
中科院分区：
文献类型：
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作者：
B. Zhu;Ran Ding;Ying Li
最轻超对称粒子(LSP)通常被认为是焦点超对称(SUSY)中的希格西诺粒子。在这种情况下，当最小超对称标准模型在双焦点超对称框架内扩展到$U(1{)}_{B\EnsureMath{-}L}$规范群时，将导致双粒子LSP。双轻子是希格西诺的翻版，它的伙伴双轻子被用来自发地打破$U(1{)}{B\保证数学{-}L}$规范对称性。然而，这种情况并不受直接探测的青睐，因为当需要正确的自散射截面时，它会导致不可接受的自旋独立截面。我们指出，即使在光存在的情况下，也不一定是这种情况。对于非零软三线性耦合${T}_{\ensureath{\eta}}$，该模型中的右手中微子在大部分参数空间中充当LSP。因此，它符合DFP SUSY的要求，不涉及任何直接检测问题。修正后的遗迹丰度可以通过一个中微子湮没成一对双轻子来实现，这对双轻子也是自相互作用暗物质(SIDM)中的光介体。此外，通过考虑右手中微子的延迟衰变，可以避开来自宇宙微波背景各向异性的严格约束。我们进一步强调需要一个大的软三线性项${T}_{\EnsureMath{\Eta}}$，以产生具有中等Yukawa耦合的理想的自散射截面$\ensuremath{\sigma}/{m}_{{\stackrel{\texttildelow{}}{\ensuremath{\nu}}}_{R}}$。数值计算表明，在我们的模型中，从矮小星系到星系团的尺度上，SIDM是可靠的。
The lightest supersymmetric particle (LSP) is generally regarded as a Higgsino in focus point supersymmetry (SUSY). Under such a circumstance, it leads to a bileptino LSP when the minimal supersymmetric Standard Model (MSSM) is extended by the $U(1{)}_{B\ensuremath{-}L}$ gauge group within the framework of double focus point (DFP) supersymmetry. The bileptino is a copy of a Higgsino whose partner, the bilepton, is used to break $U(1{)}_{B\ensuremath{-}L}$ gauge symmetry spontaneously. Such a scenario, however, is not favored by direct detection since it leads to an unacceptable spin-independent cross section when one requires a correct self-scattering cross section. We point out that is not necessarily the case even in the presence of light ${Z}^{\ensuremath{'}}$. The right-handed sneutrino in this model acts as the LSP in most of the parameter space for nonvanishing soft trilinear coupling ${T}_{\ensuremath{\eta}}$. It is thus consistent with the requirement of DFP SUSY without involving any direct detection issue. The corrected relic abundance could be achieved via a sneutrino annihilating into a pair of bileptons, which also serve as a light mediator in self-interacting dark matter (SIDM). Moreover, the stringent constraint that comes from cosmic microwave background anisotropies can be evaded by considering the retarded decay of right-handed neutrinos. We further stress the need for a large soft trilinear term ${T}_{\ensuremath{\eta}}$ in order to generate a desirable self-scattering cross section $\ensuremath{\sigma}/{m}_{{\stackrel{\texttildelow{}}{\ensuremath{\nu}}}_{R}}$ with moderate Yukawa coupling ${Y}_{\ensuremath{\eta}}$. The numerical calculation illustrates that SIDM is reliable in our model from the scales of a dwarf galaxy to a galaxy cluster.