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arXiv 1404.5973hep-ph
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B-L模型中的复标量DM

Complex Scalar DM in a B-L Model

B. L. Sánchez-Vega, J. C. Montero, E. R. Schmitz

摘要:

在这项工作中,我们实现了一个复杂的标量暗物质(DM)的候选人在$U(1)_{B-L}$规范扩展的标准模型。该模型包含三个不同量子数的右手中微子和一个丰富的标量扇区,以及额外的二重态和单线态。原则上,这些额外标量可以具有属于不同能量标度的VEV(分别用于额外双重态和单重态的$V_Φ$和$V_ϕ$)。在$ζ\equiv\frac{V_Φ}{V_ϕ}\ll1$的背景下,它允许获得自然光活性中微子质量和与中微子实验兼容的混合,DM候选人通过对给定的复杂单线态$ϕ_{2}$施加$Z_{2}$对称性而产生,以使其稳定。通过对标势和规范扇区的研究,得到了与遗迹丰度和直接探测有关的所有DM主导过程。然后,对于一组有代表性的参数,我们发现,一个复杂的DM与周围的质量$200$ GeV,例如,是兼容的,而不诉诸共振与当前的实验约束。然而,在共振附近可以找到具有更重质量的其他相容解。最后,我们解决的问题,有一个轻CP奇数标量的模型表明,它是安全的希格斯玻色子和$Z_μ$玻色子不可见的衰变宽度,以及在恒星的天体物理约束的能量损失。

英文摘要:

In this work, we implement a complex scalar Dark Matter (DM) candidate in a $U(1)_{B-L}$ gauge extension of the Standard Model. The model contains three right handed neutrinos with different quantum numbers and a rich scalar sector, with extra doublets and singlets. In principle, these extra scalars can have VEVs ($V_Φ$ and $V_ϕ$ for the extra doublets and singlets, respectively) belonging to different energy scales. In the context of $ζ\equiv\frac{V_Φ}{V_ϕ}\ll1$, which allows to obtain naturally light active neutrino masses and mixing compatible with neutrino experiments, the DM candidate arises by imposing a $Z_{2}$ symmetry on a given complex singlet, $ϕ_{2}$, in order to make it stable. After doing a study of the scalar potential and the gauge sector, we obtain all the DM dominant processes concerning the relic abundance and direct detection. Then, for a representative set of parameters, we found that a complex DM with mass around $200$ GeV, for example, is compatible with the current experimental constraints without resorting to resonances. However, additional compatible solutions with heavier masses can be found in vicinities of resonances. Finally, we address the issue of having a light CP-odd scalar in the model showing that it is safe concerning the Higgs and the $Z_μ$ boson invisible decay widths, and also the energy loss in stars astrophysical constraints.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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