Antiproton constraints on dark matter annihilations from internal electroweak bremsstrahlung

Abstract

If the dark matter particle is a Majorana fermion, annihilations into two fermions and one gauge boson could have, for some choices of the parameters of the model, a non-negligible cross-section. Using a toy model of leptophilic dark matter, we calculate the constraints on the annihilation cross-section into two electrons and one weak gauge boson from the PAMELA measurements of the cosmic antiproton-to-proton flux ratio. Furthermore, we calculate the maximal astrophysical boost factor allowed in the Milky Way under the assumption that the leptophilic dark matter particle is the dominant component of dark matter in our Universe. These constraints constitute very conservative estimates on the boost factor for more realistic models where the dark matter particle also couples to quarks and weak gauge bosons, such as the lightest neutralino which we also analyze for some concrete benchmark points. The limits on the astrophysical boost factors presented here could be used to evaluate the prospects to detect a gamma-ray signal from dark matter annihilations at currently operating IACTs as well as in the projected CTA.

32 pages; 13 figures

References in corpus (17)

• Observation of an anomalous positron abundance in the cosmic radiation
• PPPC 4 DM ID: A Poor Particle Physicist Cookbook for Dark Matter Indirect Detection
• Weak Corrections are Relevant for Dark Matter Indirect Detection
• The cosmic-ray electron flux measured by the PAMELA experiment between 1 and 625 GeV
• New Gamma-Ray Contributions to Supersymmetric Dark Matter Annihilation
• The galactic antiproton spectrum at high energies: background expectation vs. exotic contributions
• On the Importance of Electroweak Corrections for Majorana Dark Matter Indirect Detection
• H.E.S.S. constraints on Dark Matter annihilations towards the Sculptor and Carina Dwarf Galaxies
• Dark Matter: The Leptonic Connection
• W/Z Bremsstrahlung as the Dominant Annihilation Channel for Dark Matter, Revisited
• Hunting Dark Matter Gamma-Ray Lines with the Fermi LAT
• Electroweak Bremsstrahlung in Dark Matter Annihilation
• Dark Matter Annihilation Signatures from Electroweak Bremsstrahlung
• Generic dark matter signature for gamma-ray telescopes
• H.E.S.S. observations of the globular clusters NGC 6388 and M 15 and search for a Dark Matter signal
• Prospects for a Dark Matter annihilation signal towards the Sagittarius dwarf galaxy with ground based Cherenkov telescopes
• The Thermal Abundance of Semi-Relativistic Relics

Cited by in corpus (55)

• Fermi LAT Search for Internal Bremsstrahlung Signatures from Dark Matter Annihilation
• GeV-Scale Thermal WIMPs: Not Even Slightly Dead
• Astrophysical models for the origin of the positron "excess"
• Sensitivity of the Cherenkov Telescope Array to a dark matter signal from the Galactic centre
• Gamma ray constraints on Decaying Dark Matter
• Antiprotons from dark matter annihilation in the Galaxy: astrophysical uncertainties
• Simplified Models vs. Effective Field Theory Approaches in Dark Matter Searches
• A Predictive Analytic Model for the Solar Modulation of Cosmic Rays
• Antiprotons from Dark Matter: Current constraints and future sensitivities
• Searching for Dark Matter at the LHC with a Mono-Z
• Signatures of Majorana dark matter with t-channel mediators
• The one-loop and Sommerfeld electroweak corrections to the Wino dark matter annihilation
• What Does The PAMELA Antiproton Spectrum Tell Us About Dark Matter?
• Majorana Dark Matter with a Coloured Mediator: Collider vs Direct and Indirect Searches
• Antiproton constraints on the GeV gamma-ray excess: a comprehensive analysis
• Constraints on particle dark matter from cosmic-ray antiprotons
• Decaying vs Annihilating Dark Matter in Light of a Tentative Gamma-Ray Line
• Dark matter annihilations into two light fermions and one gauge boson: general analysis and antiproton constraints
• Internal bremsstrahlung signatures in light of direct dark matter searches
• Mono-W Dark Matter Signals at the LHC: Simplified Model Analysis
• Dark matter at the LHC: EFTs and gauge invariance
• On the effective operators for Dark Matter annihilations
• A fussy revisitation of antiprotons as a tool for Dark Matter searches
• Gamma-ray boxes from axion-mediated dark matter
• Current status and muon $g-2$ explanation of lepton portal dark matter
• Sharp Gamma-ray Spectral Features from Scalar Dark Matter Annihilations
• Coloured coannihilations: Dark matter phenomenology meets non-relativistic EFTs
• Initial State Radiation in Majorana Dark Matter Annihilations
• Bremsstrahlung in dark matter annihilation
• Closing in on mass-degenerate dark matter scenarios with antiprotons and direct detection
• Electroweak and Higgs Boson Internal Bremsstrahlung: General considerations for Majorana dark matter annihilation and application to MSSM neutralinos
• Enhancing Dark Matter Annihilation Rates with Dark Bremsstrahlung
• Constraints on dark matter annihilations from diffuse gamma-ray emission in the Galaxy
• Prospects for discovering a neutrino line induced by dark matter annihilation
• Dark Matter after BESS-Polar II
• Significant Enhancement of Neutralino Dark Matter Annihilation from Electroweak Bremsstrahlung
• Study of the Gamma-ray Spectrum from the Galactic Center in view of Multi-TeV Dark Matter Candidates
• Neutrino signals from electroweak bremsstrahlung in solar WIMP annihilation
• Leading QCD Corrections for Indirect Dark Matter Searches: a Fresh Look
• On the spin-dependent sensitivity of XENON100
• Hadronic Footprint of GeV-Mass Dark Matter
• Bremsstrahlung signatures of dark matter annihilation in the Sun
• High-energy neutrino signals from the Sun in dark matter scenarios with internal bremsstrahlung
• Enhancement of Majorana Dark Matter Annihilation Through Higgs Bremsstrahlung
• The Role of Electroweak Corrections for the Dark Matter Relic Abundance
• Electroweak fragmentation functions for dark matter annihilation
• A Large Muon EDM from Dark Matter
• Revisiting Discrete Dark Matter Model:θ_{13}\neq0 and ν_{R} Dark Matter
• Electroweak lights from Dark Matter annihilations
• t-channel dark matter at the LHC -- a whitepaper
• Constraints on dark matter annihilation to fermions and a photon
• Sensitivity of the Cherenkov Telescope Array to a dark matter signal from the Galactic centre
• Gamma Rays from Bino-like Dark Matter in the MSSM
• Electroweak bremsstrahlung in bino-like dark matter annihilations
• Catching p via s wave with indirect detection