Simplified dark matter models confront the gamma ray excess

被引：24

作者：

Balazs, Csaba ^{[1
]}

Li, Tong ^{[1
]}

机构：

[1] Monash Univ, Sch Phys, ARC Ctr Excellence Particle Phys Tera Scale, Melbourne, Vic 3800, Australia

来源：

PHYSICAL REVIEW D | 2014年 / 90卷 / 05期

基金：

澳大利亚研究理事会;

关键词：

EFFECTIVE-FIELD THEORY; GALACTIC-CENTER; SEARCHES; ANNIHILATION; CONSTRAINTS; EMISSION;

D O I：

10.1103/PhysRevD.90.055026

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Inspired by the excess of gamma rays from the Galactic Center, we confront a number of simplified dark matter models with experimental data. Assuming a single dark matter particle coupled to standard matter via a spin-0 mediator, we compare model evidences for Majorana fermion, real scalar, and real vector dark matter candidates. We consider dark matter annihilation into various fermionic final states contributing to the observed differential gamma ray flux. Our likelihood function also includes the dark matter relic density, its elastic scattering cross section with nuclei, and collider limits. Using Bayesian inference we confine the mass and couplings strengths of the dark matter and mediator particle. Our results show that, if the gamma ray excess is due to dark matter the above parameters are well constrained by the observations. We find that the Majorana fermion dark matter model is supported the most by the data.

引用

页数：12

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