In this study, we analyze the direct-detection constraints of light dark matter in the next-to minimal supersymmetric standard model (NMSSM) with non-universal Higgs masses (NUHM); we specially focus on the correlation between higgsino asymmetry and spin-dependent (SD) cross section. We draw the following conclusions. (i) The SD cross section is proportional to the square of higgsino asymmetry in dark matter in the NMSSM-NUHM, and hence, it is small for highly singlino-dominated dark matter. (ii) The higgsino-mass parameter is smaller than approximately in the NMSSM-NUHM due to the current muon g-2 constraint, but our scenario with light dark matter can still be alive under current constraints including the direct detection of dark matter in the spin-dependent channel. (iii) With a sizeable higgsino component in the light dark matter, the higgsino asymmetry and SD cross section can also be sizeable, but dark matter relic density is always small; thus, it can escape the direct detections. (iv) Light dark matter in the - and Z-funnel annihilation channels with sufficient relic density can be covered by future LUX-ZEPLIN (LZ) 7-ton in SD detections. (v) The spin-independent (SI) cross section is dominated by - and -exchanging channels, which can even cancel each other in some samples, leaving an SI cross section smaller by a few orders of magnitude than that of one individual channel.

在这项研究中，我们分析了具有非通用希格斯质量（NUHM）的次极小超对称标准模型（NMSSM）中轻暗物质的直接探测约束；我们特别关注 higgsino 不对称性和自旋相关 (SD) 横截面之间的相关性。我们得出以下结论。(i) SD 截面与 NMSSM-NUHM 中暗物质中希格斯诺不对称的平方成正比，因此，对于高度单线主导的暗物质，它很小。(ii) higgsino-mass 参数小于NMSSM-NUHM 中的近似值，因为当前的μg-2 约束，但我们的轻暗物质场景在当前约束下仍然存在，包括在自旋相关通道中直接检测暗物质。(iii) 轻暗物质中的希格西诺成分相当大，希格西诺不对称性和 SD 截面也可以相当大，但暗物质遗迹密度总是很小；因此，它可以逃避直接检测。(iv)未来的 LUX-ZEPLIN (LZ) 7 吨 SD 探测可以覆盖- 和Z - 漏斗湮没通道中具有足够遗物密度的轻暗物质。(v) 自旋无关 (SI) 截面由- 和-交换通道，在某些样本中甚至可以相互抵消，使 SI 横截面比单个通道的横截面小几个数量级。