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arXiv 1408.4929hep-ph
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具有赝标Yukawa相互作用的费米暗物质

Fermionic dark matter with pseudo-scalar Yukawa interaction

Karim Ghorbani

摘要:

我们考虑一个标准模型的可重正化扩展,其费米暗物质(DM)候选者通过一个伪标量Yukawa项与一个真实的单重态伪标量相互作用,同时我们假设完整的拉格朗日量在经典水平上是CP守恒的。当赝标玻色子发展出非零真空期望值时,自发CP破坏发生,这通过类希格斯玻色子和类SM希格斯玻色子玻色子之间的混合提供了暗扇区与SM粒子的CP破坏相互作用。此方案建议使用最少数量的自由参数。主要针对间接探测观测量,计算了暗物质湮灭截面,进而计算了$m_{\text{DM}} = 300$ GeV范围内的暗物质遗迹密度。然后,我们发现可行的区域在参数空间中所观察到的DM遗迹丰度的约束,以及不可见的希格斯衰变宽度在125 GeV的希格斯发现在LHC的光。我们发现,在参数空间的约束区域内,存在一个质量为$m_{\text{DM}} \sim 38$ GeV的暗物质主要湮灭为$b$夸克的模型,该模型可以解释Fermi-LAT星系γ射线过剩现象.

英文摘要:

We consider a renormalizable extension of the standard model whose fermionic dark matter (DM) candidate interacts with a real singlet pseudo-scalar via a pseudo-scalar Yukawa term while we assume that the full Lagrangian is CP-conserved in the classical level. When the pseudo-scalar boson develops a non-zero vacuum expectation value, spontaneous CP-violation occurs and this provides a CP-violated interaction of the dark sector with the SM particles through mixing between the Higgs-like boson and the SM-like Higgs boson. This scenario suggests a minimal number of free parameters. Focusing mainly on the indirect detection observables, we calculate the dark matter annihilation cross section and then compute the DM relic density in the range up to $m_{\text{DM}} = 300$ GeV. We then find viable regions in the parameter space constrained by the observed DM relic abundance as well as invisible Higgs decay width in the light of 125 GeV Higgs discovery at the LHC. We find that within the constrained region of the parameter space, there exists a model with dark matter mass $m_{\text{DM}} \sim 38$ GeV annihilating predominantly into $b$ quarks, which can explain the Fermi-LAT galactic gamma-ray excess.

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