Consistent explanation for the cosmic-ray positron excess in $p$-wave Breit-Wigner enhanced dark matter annihilation

Abstract

Dark matter (DM) annihilation in the galactic halo can be enhanced relative to that in the early Universe due to the Breit-Wigner enhancement, if the DM particles annihilate through a narrow resonance. Although the $s$-wave Breit-Wigner enhancement can provide a consistent explanation for both the observed cosmic-ray (CR) positron excess and the DM thermal relic density, it is severely constrained by the observations of gamma rays from dwarf spheroidal satellite galaxies (dSphs) and the cosmic microwave background (CMB), which have relatively lower allowed DM annihilation cross section and typical DM velocities than that in the galactic halo. Furthermore, in the $s$-wave Breit-Wigner enhancement, the case where the resonance mass is below a threshold (twice the DM mass) is ruled out due to the monotonically increasing annihilation cross section with decreasing DM velocity. In this work, we consider Breit-Wigner enhanced $p$-wave DM annihilation. We explore the parameter regions which can simultaneously account for the CR positron excess and DM thermal relic density without violating the constraints from dSphs gamma rays and CMB. We show that the velocity-dependent cross section in this scenario can peak around the typical DM velocity in the galactic halo for the resonance mass both above and below the threshold. Moreover, the highly suppressed annihilation cross section at extremely low DM velocity can evade the constraints from dSphs gamma rays and CMB easily, which results in larger allowed parameter regions than that in the $s$-wave case.

arXiv comment23 pages, 9 figures

References in corpus (71)

• A Universal Density Profile from Hierarchical Clustering
• An Introduction to PYTHIA 8.2
• Supersymmetric Dark Matter
• MultiNest: an efficient and robust Bayesian inference tool for cosmology and particle physics
• Dwarf Galaxies of the Local Group
• A Theory of Dark Matter
• Multimodal nested sampling: an efficient and robust alternative to MCMC methods for astronomical data analysis
• Minimal Flavour Violation: an effective field theory approach
• Cosmic-ray propagation and interactions in the Galaxy
• Searching for Dark Matter Annihilation from Milky Way Dwarf Spheroidal Galaxies with Six Years of Fermi-LAT Data
• Propagation of cosmic-ray nucleons in the Galaxy
• Importance Nested Sampling and the MultiNest Algorithm
• Clumps and streams in the local dark matter distribution
• Precise Relic WIMP Abundance and its Impact on Searches for Dark Matter Annihilation
• Cosmology and Astrophysics of Minimal Dark Matter
• Measurement of separate cosmic-ray electron and positron spectra with the Fermi Large Area Telescope
• Astrophysical Signatures of Secluded Dark Matter
• Model-independent implications of the e+, e-, anti-proton cosmic ray spectra on properties of Dark Matter
• Pulsars as the Sources of High Energy Cosmic Ray Positrons
• Indirect Dark Matter Signatures in the Cosmic Dark Ages I. Generalizing the Bound on s-wave Dark Matter Annihilation from Planck
• CMB Constraints on WIMP Annihilation: Energy Absorption During the Recombination Epoch
• Dark Matter Constraints from Observations of 25 Milky Way Satellite Galaxies with the Fermi Large Area Telescope
• Explosive Dark Matter Annihilation
• Secondary antiprotons and propagation of cosmic rays in the Galaxy and heliosphere
• Particle decays during the cosmic dark ages
• HI in Local Group Dwarf Galaxies and Stripping by the Galactic Halo
• Detecting Dark Matter Annihilation with CMB Polarization : Signatures and Experimental Prospects
• TeV Gamma Rays from Geminga and the Origin of the GeV Positron Excess
• CMB constraints on Dark Matter models with large annihilation cross-section
• Dissipation of Magnetohydrodynamic Waves on Energetic Particles: Impact on Interstellar Turbulence and Cosmic Ray Transport
• Search for dark matter annihilations towards the inner Galactic halo from 10 years of observations with H.E.S.S
• The origin of the positron excess in cosmic rays
• The cosmic-ray positron energy spectrum measured by PAMELA
• Damping scales of neutralino cold dark matter
• New Positron Spectral Features from Supersymmetric Dark Matter - a Way to Explain the PAMELA Data?
• A blueprint for detecting supersymmetric dark matter in the Galactic halo
• Indirect Dark Matter Signatures in the Cosmic Dark Ages II. Ionization, Heating and Photon Production from Arbitrary Energy Injections
• Breit-Wigner Enhancement of Dark Matter Annihilation
• Sommerfeld factor for arbitrary partial wave processes
• WIMPonium and Boost Factors for Indirect Dark Matter Detection
• Searching for Dark Matter in the CMB: A Compact Parameterization of Energy Injection from New Physics
• Current Dark Matter Annihilation Constraints from CMB and Low-Redshift Data
• Unitarity and Higher-Order Corrections in Neutralino Dark Matter Annihilation into Two Photons
• Dark matter interpretation of recent electron and positron data
• Limits on Dark Matter Annihilation Signals from the Fermi LAT 4-year Measurement of the Isotropic Gamma-Ray Background
• Sommerfeld enhancement: general results from field theory diagrams
• HAWC Observations Strongly Favor Pulsar Interpretations of the Cosmic-Ray Positron Excess
• Models for Galactic cosmic-ray propagation
• High Energy Positrons From Annihilating Dark Matter
• Dissecting cosmic-ray electron-positron data with Occam's Razor: the role of known Pulsars
• Enhancement of Dark Matter Annihilation via Breit-Wigner Resonance
• Challenging cosmic ray propagation with antiprotons. Evidence for a "fresh" nuclei component?
• Flavor-specific scalar mediators
• Is the PAMELA anomaly caused by the supernova explosions near the Earth?
• Kinetic decoupling of neutralino dark matter
• The Leptonic Higgs Portal
• Quantitative study of the AMS-02 electron/positron spectra: implications for the pulsar and dark matter properties
• Parameters in a Class of Leptophilic Dark Matter Models from PAMELA, ATIC and FERMI
• Cosmological constraints on dark matter models with velocity-dependent annihilation cross section
• Implications of the first AMS-02 measurement for dark matter annihilation and decay
• Can we explain AMS-02 antiproton and positron excesses simultaneously by nearby supernovae without pulsars nor dark matter?
• Neutrino Mass and Dark Matter in light of recent AMS-02 results
• DRAKE: Dark matter Relic Abundance beyond Kinetic Equilibrium
• Cosmic ray propagation and dark matter in light of the latest AMS-02 data
• On the e${}^{+}$e${}^{-}$ excesses and the knee of the cosmic ray spectra -- hints of cosmic rays acceleration at young supernova remnants
• Probing Leptophilic Dark Sectors at Electron Beam-Dump Facilities
• The 130 GeV gamma-ray line and Sommerfeld enhancements
• Supersymmetric Resonant Dark Matter: a Thermal Model for the AMS-02 Positron Excess
• A dark matter model that reconciles tensions between the cosmic-ray $e^{\pm }$ excess and the gamma-ray and CMB constraints
• Breit-Wigner Enhancement Considering the Dark Matter Kinetic Decoupling
• Galactic Positron Excess from Selectively Enhanced Dark Matter Annihilation

Cited by in corpus (3)

• Searching Accretion-Enhanced Dark Matter Annihilation Signals in the Galactic Centre
• GeV-scale dark matter with $p$-wave Breit-Wigner enhanced annihilation
• Enhanced cosmic-ray antihelium production from dark matter annihilation through light mediators