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arXiv 1302.3936hep-phastro-ph.HE
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解释希格斯玻色子衰变和费米LAT中可能的伽马过剩的多组分暗物质的双回路辐射跷跷板

Two-loop radiative seesaw with multicomponent dark matter explaining the possible gamma excess in the Higgs boson decay and at the Fermi LAT

Mayumi Aoki, Jisuke Kubo, Hiroshi Takano

摘要:

本文提出了一个非超对称的双环辐射跷跷板模型。该模型除了包含标准模型(SM)的希格斯玻色子玻色子外,还包含一个惰性SU(2)_L二重态标量eta和两个惰性单重态标量phi和chi。轻子数被一个二维算符软破缺,树能级狄拉克质量被Z_2 x Z_2'(或D_{2N})禁止,它预言了两个或三个暗物质粒子的存在。标量扇区是最小的;没有一个标量场可以被抑制以使辐射跷跷板机制起作用。有副产品:SM希格斯玻色子衰变为两个伽马粒子的过程被在h到gamma的单圈图中循环的eta^+(eta的带电分量)略微增强。在费米LAT观测到的135 GeV伽马射线线也可以用chi暗物质的湮灭来解释。我们采用随温度变化的湮没截面机制来抑制连续γ射线和反质子的产生。这种解释甚至可以在XENON 1 T的灵敏度极限下生存。

英文摘要:

A non-supersymmetric model of a two-loop radiative seesaw is proposed. The model contains, in addition to the standard model (SM) Higgs boson, an inert SU(2)_L doublet scalar eta and two inert singlet scalars phi and chi. The lepton number is softly broken by a dimension-two operator, and the tree-level Dirac mass is forbidden by Z_2 x Z_2' (or D_{2N}), which predicts the existence of two or three dark matter particles. The scalar sector is minimal; none of the scalar fields can be suppressed for the radiative seesaw mechanism to work. There are by-products: The SM Higgs boson decay into two gamma's is slightly enhanced by eta^+ (the charged component of eta) circulating in one-loop diagrams for h to gamma gamma. The 135 GeV gamma-ray line observed at the Fermi LAT can be also explained by the annihilation of chi dark matter. We employ a mechanism of temperature-dependent annihilation cross section to suppress the continuum gamma rays and the production of antiprotons. The explanation can survive even down to the XENON1T sensitivity limit.

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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