Extra U(1) as natural source of a monochromatic gamma ray line

TL;DR

This paper explores how an extra U(1) gauge symmetry in extensions of the Standard Model can naturally produce a monochromatic gamma-ray line, consistent with dark matter observations and constrained by cosmological data.

Contribution

It demonstrates that an extra U(1) gauge group can generate observable gamma-ray lines and constrains its coupling using WMAP data, linking particle physics with astrophysical signals.

Findings

Extra U(1) gauge symmetry predicts gamma-ray lines at 130 GeV.

WMAP data constrains the gauge coupling g_D to electroweak scale.

Model fits the FERMI gamma-ray signal with dark matter around 144.5 GeV.

Abstract

Extensions of the Standard Model with an extra U'(1) abelian group generically generate terms coming from loops of heavy fermions, leading to three gauge boson couplings, in particular Z'Z gamma. We show that WMAP data constrains the gauge coupling of the group g_D to values comparable with the electro-weak ones, rather independently of the mass of Z'. Moreover, the model predicts a monochromatic gamma-ray line which can fit a 130 GeV signal at the FERMI telescope for natural values of the Chern-Simons terms and a dark matter mass around 144.5 GeV.