论文标题
轻柔地从暗物质直接检测
Softly shifting away from dark matter direct detection
论文作者
论文摘要
我们提出了一类复合暗物质模型中的暗物质（DM）移位对称性的软性破坏机制，其中DM和Higgs玻色子都是新型强动力学的伪nambu-goldstone玻色子出现的。我们的机制用于抑制希格斯玻色子和DM粒子之间的非衍生门户耦合，这可以逃避当前DM直接检测实验的严格结合。否则，这种非衍生的门户耦合自然将处于希格斯四分之一的相同顺序，从而在严重的危机下构成了这类模型。为了实现软性破坏机制，我们引入了类似矢量的顶级合作伙伴，称为“软体”，以恢复顶级Yukawa部门DM的移位对称性，但是，Softon Masses只会破坏。随着偏移对称的Softon群众接近零，门户耦合将自动消失。具体而言，我们基于coset $ o（6）/o（5）$和最简单的费米亚嵌入，并研究其DM现象学，我们展示了大量的新型参数空间通过使用软性破裂机制打开，因此我们提出了软性破裂的概念验证模型。
We propose soft breaking mechanism for dark matter (DM) shift symmetry in a class of composite dark matter models, where both DM and the Higgs boson arise as pseudo Nambu-Goldstone bosons from novel strong dynamics. Our mechanism is utilized to suppress the non-derivative portal coupling between the Higgs boson and DM particle, which can evade the stringent bound of current DM direct detection experiments. Otherwise this non-derivative portal coupling would naturally be at the same order of the Higgs quartic, rendering this class of models under severe crisis. For realizing soft breaking mechanism, we introduce vector-like top partners, dubbed as "softons", to restore the shift symmetry of DM in top Yukawa sector, which however is only broken by the softon masses. The portal coupling would automatically vanish as the shift-symmetry-breaking softon masses approach zero. Specifically we present a proof-of-concept model of soft breaking, based on the coset $O(6)/O(5)$ and the simplest fermion embedding, and study its DM phenomenology, where we show a large amount of novel parameter space is opened up by using the soft breaking mechanism.
