Electroweak and Higgs Boson Internal Bremsstrahlung: General considerations for Majorana dark matter annihilation and application to MSSM neutralinos
arXiv:1705.03466 · doi:10.1007/JHEP09(2017)041
Abstract
It is well known that the annihilation of Majorana dark matter into fermions is helicity suppressed. Here, we point out that the underlying mechanism is a subtle combination of two distinct effects, and we present a comprehensive analysis of how the suppression can be partially or fully lifted by the internal bremsstrahlung of an additional boson in the final state. As a concrete illustration, we compute analytically the full amplitudes and annihilation rates of supersymmetric neutralinos to final states that contain any combination of two standard model fermions, plus one electroweak gauge boson or one of the five physical Higgs bosons that appear in the minimal supersymmetric standard model. We classify the various ways in which these three-body rates can be large compared to the two-body rates, identifying cases that have not been pointed out before. In our analysis, we put special emphasis on how to avoid the double counting of identical kinematic situations that appear for two-body and three-body final states, in particular on how to correctly treat differential rates and the spectrum of the resulting stable particles that is relevant for indirect dark matter searches. We find that both the total annihilation rates and the yields can be significantly enhanced when taking into account the corrections computed here, in particular for models with somewhat small annihilation rates at tree-level which otherwise would not be testable with indirect dark matter searches. Even more importantly, however, we find that the resulting annihilation spectra of positrons, neutrinos, gamma-rays and antiprotons differ in general substantially from the model-independent spectra that are commonly adopted, for these final states, when constraining particle dark matter with indirect detection experiments.
arXiv comment64 pages with jheppub.sty, 15 figures and 12 tables. Slightly extended discussion + minor updates to match published version
References in corpus (64)
- A Brief Introduction to PYTHIA 8.1
- Supersymmetric Dark Matter
- Big-Bang Nucleosynthesis
- MultiNest: an efficient and robust Bayesian inference tool for cosmology and particle physics
- Generating Feynman Diagrams and Amplitudes with FeynArts 3
- First results from the LUX dark matter experiment at the Sanford Underground Research Facility
- Combined Measurement of the Higgs Boson Mass in Collisions at and 8 TeV with the ATLAS and CMS Experiments
- Searching for Dark Matter Annihilation from Milky Way Dwarf Spheroidal Galaxies with Six Years of Fermi-LAT Data
- CalcHEP 3.4 for collider physics within and beyond the Standard Model
- DarkSUSY: Computing Supersymmetric Dark Matter Properties Numerically
- micrOMEGAs3.1 : a program for calculating dark matter observables
- Neutralino Relic Density including Coannihilations
- Dark Matter Results from First 98.7-day Data of PandaX-II Experiment
- Explosive Dark Matter Annihilation
- Improved Limits on Scattering of Weakly Interacting Massive Particles from Reanalysis of 2013 LUX data
- Weak Corrections are Relevant for Dark Matter Indirect Detection
- Search for direct production of charginos, neutralinos and sleptons in final states with two leptons and missing transverse momentum in pp collisions at sqrt(s) = 8 TeV with the ATLAS detector
- Search for top-squark pair production in the single-lepton final state in pp collisions at sqrt(s) = 8 TeV
- New Positron Spectral Features from Supersymmetric Dark Matter - a Way to Explain the PAMELA Data?
- New limits on dark matter annihilation from AMS cosmic ray positron data
- New Gamma-Ray Contributions to Supersymmetric Dark Matter Annihilation
- Search for direct third-generation squark pair production in final states with missing transverse momentum and two b-jets in sqrt{s}=8 TeV pp collisions with the ATLAS detector
- Search for pair-produced third-generation squarks decaying via charm quarks or in compressed supersymmetric scenarios in collisions at TeV with the ATLAS detector
- DarkSUSY 6 : An Advanced Tool to Compute Dark Matter Properties Numerically
- Matrix element analyses of dark matter scattering and annihilation
- Accurate relic densities with neutralino, chargino and sfermion coannihilations in mSUGRA
- On the Importance of Electroweak Corrections for Majorana Dark Matter Indirect Detection
- Narrow-width approximation accuracy
- Scalar Dark Matter Models with Significant Internal Bremsstrahlung
- Heavy Dark Matter Annihilation from Effective Field Theory
- Internal Bremsstrahlung Signature of Real Scalar Dark Matter and Consistency with Thermal Relic Density
- On the role of electroweak bremsstrahlung for indirect dark matter signatures
- W/Z Bremsstrahlung as the Dominant Annihilation Channel for Dark Matter, Revisited
- Searches for supersymmetry using the MT2 variable in hadronic events produced in pp collisions at 8 TeV
- Search for top-squark pairs decaying into Higgs or Z bosons in pp collisions at sqrt(s) = 8 TeV
- Antiproton constraints on dark matter annihilations from internal electroweak bremsstrahlung
- On the Annihilation Rate of WIMPs
- Soft Collinear Effective Theory for Heavy WIMP Annihilation
- Dark matter annihilations into two light fermions and one gauge boson: general analysis and antiproton constraints
- Dark Matter Annihilation Signatures from Electroweak Bremsstrahlung
- On the effective operators for Dark Matter annihilations
- Signatures from Scalar Dark Matter with a Vector-like Quark Mediator
- The last refuge of mixed wino-Higgsino dark matter
- Sharp Gamma-ray Spectral Features from Scalar Dark Matter Annihilations
- Initial State Radiation in Majorana Dark Matter Annihilations
- Enhancing Dark Matter Annihilation Rates with Dark Bremsstrahlung
- Aspects of Neutrino Detection of Neutralino Dark Matter
- Bremsstrahlung and Gamma Ray Lines in 3 Scenarios of Dark Matter Annihilation
- Large contributions to dark matter annihilation from three-body final states
- Significant Enhancement of Neutralino Dark Matter Annihilation from Electroweak Bremsstrahlung
- Three-Body Annihilation of Neutralinos Below Two-Body Thresholds
- Higher order dark matter annihilations in the Sun and implications for IceCube
- Electroweak bremsstrahlung for wino-like Dark Matter annihilations
- Neutrino signals from electroweak bremsstrahlung in solar WIMP annihilation
- The 130 GeV gamma-ray line and generic dark matter model building constraints from continuum gamma rays, radio and antiproton data
- Leading QCD Corrections for Indirect Dark Matter Searches: a Fresh Look
- Bremsstrahlung signatures of dark matter annihilation in the Sun
- High-energy neutrino signals from the Sun in dark matter scenarios with internal bremsstrahlung
- Vector dark matter annihilation with internal bremsstrahlung
- Enhancement of Majorana Dark Matter Annihilation Through Higgs Bremsstrahlung
- Electroweak fragmentation functions for dark matter annihilation
- Dark matter annihilation with s-channel internal Higgsstrahlung
- Electroweak bremsstrahlung in bino-like dark matter annihilations
- Novel method to deal with off-shell particles in cascade decays
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- GeV-Scale Thermal WIMPs: Not Even Slightly Dead
- DarkSUSY 6 : An Advanced Tool to Compute Dark Matter Properties Numerically
- MadDM v.3.0: a Comprehensive Tool for Dark Matter Studies
- Sensitivity of the Cherenkov Telescope Array to a dark matter signal from the Galactic centre
- Global fits of GUT-scale SUSY models with GAMBIT
- A global fit of the MSSM with GAMBIT
- Top-philic dark matter within and beyond the WIMP paradigm
- DRAKE: Dark matter Relic Abundance beyond Kinetic Equilibrium
- Top-philic Vector-Like Portal to Scalar Dark Matter
- Freezing-in a hot bath: resonances, medium effects and phase transitions
- Prospects for discovering a neutrino line induced by dark matter annihilation
- Impact of cosmological and astrophysical constraints on dark matter simplified models
- Hadronic Footprint of GeV-Mass Dark Matter
- Radiative corrections to vectorlike portal dark matter
- Enhanced neutrino emissivities in pseudoscalar-mediated Dark Matter annihilation in Neutron Stars
- Scalar Dark Matter with Strong Positron Fluxes
- AMS-02 antiprotons and dark matter: Trimmed hints and robust bounds
- Investigating higgsino dark matter in the semi-constrained NMSSM
- Sensitivity of the Cherenkov Telescope Array to a dark matter signal from the Galactic centre
- Non-Standard Neutrino Spectra From Annihilating Neutralino Dark Matter