skip to main content

SciTech ConnectSciTech Connect

Title: Enhancement of Majorana dark matter annihilation through Higgs bremsstrahlung

For Majorana dark matter, gauge boson bremsstrahlung plays an important role in enhancing an otherwise helicity-suppressed s-wave annihilation cross-section. This is well known for processes involving a radiated photon or gluon together with a Standard Model fermion-antifermion pair, and the case of massive electroweak gauge bosons has also recently been studied. Here we show that internal Higgs bremsstrahlung also lifts helicity suppression and could be the dominant contribution to the annihilation rate in the late Universe for dark matter masses below ∼ 1 TeV. Using a toy model of leptophilic dark matter, we calculate the annihilation cross-section into a lepton-antilepton pair with a Higgs boson and investigate the energy spectra of the final stable particles at the annihilation point.
Authors:
;  [1]
  1. Theoretical Particle Physics and Cosmology Group, Physics Department, King's College London, London, WC2R 2LS (United Kingdom)
Publication Date:
OSTI Identifier:
22369869
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Cosmology and Astroparticle Physics; Journal Volume: 2013; Journal Issue: 12; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ANNIHILATION; ANTILEPTONS; BREMSSTRAHLUNG; CROSS SECTIONS; ENERGY SPECTRA; GLUONS; HELICITY; HIGGS BOSONS; HIGGS MODEL; NONLUMINOUS MATTER; PHOTONS; S WAVES; STANDARD MODEL; UNIVERSE