论文标题
左右对称量规模型的暗物质透视图
Dark Matter perspective of Left-Right symmetric gauge model
论文作者
论文摘要
我们考虑使用$ su（3）_c \ otimes su（2）_l \ otimes u（1）_l \ otimes su（2）_r \ outimes u（1）u（1）u（1）_r $的左右对称模型的化身。 $ e_6 $的{\ bf 27}中存在的重量标量和费米子与标准模型费米子一起包含在物质扇区中。两个这样的彩色单元费用，$ n $和$ l_s $，分别以$ su（2）$ s的形式转换为bi-doublet和singlet，可能是暗物质（DM）的潜在候选者。 $ u（1）$的分配费用限制了一些异国情调的费米子与SM费米子进行互动。我们通过一些细节研究了这种费米子暗物质的前景，通过计算遗物密度和直接检测横截面来依次将这些颗粒视为独立的遗物颗粒。与实验上限相比，当将$ n $视为遗物粒子时，将产生一个很高的直接检测横截面。但是，可以通过引入涉及两个$ n $ fields和两个SM fermions并适当选择耦合常数的Dimension-6操作员来控制$ n $的交互速率。反过来，这使得交互速率非常高，并且产生了较小的遗物密度。另一方面，对于某些选择的质量窗口，$ L_S $可以为我们提供适量的遗物，但其直接检测横截面太小。请记住，我们提出了DM的两个组件模型，尽管$ n $和$ l_s $都有助于遗物密度，尽管其比例不相等，而直接检测横截面限制可以主要通过$ n $来满足$ n $在额外的尺寸-6交互作用的情况下。我们从Xenon实验中得出了这种相互作用的限制。
We consider an incarnation of left-right symmetric model with a local gauge symmetry of $SU(3)_C \otimes SU(2)_L \otimes U(1)_L \otimes SU(2)_R \otimes U(1)_R$. Heavy scalars and fermions present in the {\bf 27} of $E_6$ are included in the matter sector along with the Standard Model fermions. Two such colour singlet fermions, $N$ and $l_S$, transforming as bi-doublet and singlet under $SU(2)$s respectively, can be potential candidates for Dark Matter (DM). Assignment of $U(1)$ charges for the matter fields restricts some of the exotic fermions to interact with the SM fermions. We study in some details the prospect of such fermionic dark matters by calculating relic densities and direct detection cross-sections by treating these particles as stand alone relic particles in turn. $N$, when treated as relic particle, would produce a direct-detection cross-section very high compared to the experimental upper limits. However, the interaction rate of $N$ can be controlled by introducing a dimension-6 operator involving two $N$ fields and two SM fermions and appropriately choosing the coupling constant. This in turn, makes the interaction rate of $N$ very high and yields a small relic density. On the other hand, $l_S$ for some chosen mass window, can give us right amount of relic, but its direct detection cross-section is too small. Keeping these in mind, we propose two-component model of DM, where both $N$ and $l_S$ contribute to the relic density, albeit with unequal proportion while the direct detection cross-section limits can be satisfied mainly by $N$ in presence of an extra dimension-6 interaction. We derive limits on such an interaction from XENON experiment.
