Constraints on dark matter annihilation to fermions and a photon
Abstract
We consider Majorana dark matter annihilation to fermion - anti-fermion pair and a photon in the effective field theory paradigm, by introducing dimension 6 and dimension 8 operators in the Lagrangian. For a given value of the cut-off scale, the latter dominates the annihilation process for heavier dark matter masses. We find a cancellation in the dark matter annihilation to a fermion - anti-fermion pair when considering the interference of the dimension 6 and the dimension 8 operators. Constraints on the effective scale cut-off is derived while considering indirect detection experiments and the relic density requirements and they are compared to the bound coming from collider experiments.
Keywords
Cite
@article{arxiv.1601.06140,
title = {Constraints on dark matter annihilation to fermions and a photon},
author = {Debtosh Chowdhury and Abhishek M. Iyer and Ranjan Laha},
journal= {arXiv preprint arXiv:1601.06140},
year = {2018}
}
Comments
v2: 21 pages, 5 figures. Some details about the calculation are moved to the Appendix. Conclusions unchanged. Accepted in JHEP