Stealth decaying spin-1 dark matter

被引：11

作者：

Delaunay, Cedric ^{[1
]}

Ma, Teng ^{[2
]}

Soreq, Yotam ^{[2
]}

机构：

[1] CNRS USMB, LAPTh, BP 110 Annecy Le Vieux, F-74941 Annecy, France

[2] Technion Israel Inst Technol, Phys Dept, IL-3200003 Haifa, Israel

来源：

JOURNAL OF HIGH ENERGY PHYSICS | 2021年 / 2021卷 / 02期

基金：

以色列科学基金会; 美国国家科学基金会;

关键词：

Phenomenological Models; PARTICLES; LIMITS; CONSTRAINTS;

D O I：

10.1007/JHEP02(2021)010

中图分类号：

O412 [相对论、场论]; O572.2 [粒子物理学];

学科分类号：

摘要：

We consider models of decaying spin-1 dark matter whose dominant coupling to the standard model sector is through a dark-Higgs Yukawa portal connecting a TeV-scale vector-like lepton to the standard model (right-handed) electron. Below the electron-positron threshold, dark matter has very slow, loop-suppressed decays to photons and (electron) neutrinos, and is stable on cosmological time-scale for sufficiently small gauge coupling values. Its relic abundance is set by in-equilibrium dark lepton decays, through the freeze-in mechanism. We show that this model accommodates the observed dark matter abundance for natural values of its parameters and a dark matter mass in the similar to 5 keV to 1 MeV range, while evading constraints from direct detection, indirect detection, stellar cooling and cosmology. We also consider the possibility of a nonzero gauge kinetic mixing with the standard model hypercharge field, which is found to yield a mild impact on the model's phenomenology.

引用

页数：27

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