Enhanced One-Loop Corrections to WIMP Annihilation and their Thermal Relic Density in the Coannihilation Region

Abstract

We consider quantum corrections to co-annihilation processes of Weakly Interacting Massive Particles (WIMPs) due to the exchange of light bosons in the initial state ("Sommerfeld corrections"). We work at one-loop level, i.e. we assume that these corrections can be treated perturbatively. Co-annihilation is important if there is at least one additional new particle with mass close to the lightest WIMP, which is a Dark Matter candidate. In this case the exchange of a (relatively light) boson in the initial state can change the identity of the annihilating particles. The corrections we are interested in factorize, as in the case of WIMP self-annihilation treated previously, but they can mix different tree-level amplitudes. Moreover, even small mass splittings between the external particles and those in the loop can change the relevant loop functions significantly. We find exact analytical expressions for these functions, and illustrate the effects by considering the cases of wino- or higgsino-like neutralinos as examples.

39 pages, 18 figures

References in corpus (27)

• Seven-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Interpretation
• Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Interpretation
• Out Of This World Supersymmetry Breaking
• Three Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Polarization Analysis
• Gaugino Mass without Singlets
• DarkSUSY: Computing Supersymmetric Dark Matter Properties Numerically
• micrOMEGAs2.0: a program to calculate the relic density of dark matter in a generic model
• Neutralino Relic Density including Coannihilations
• Non-Perturbative Effect on Dark Matter Annihilation and Gamma Ray Signature from Galactic Center
• Explosive Dark Matter Annihilation
• Dimensionless constants, cosmology and other dark matters
• Phenomenological consequences of supersymmetry with anomaly-induced masses
• Calculations of Neutralino-Stau Coannihilation Channels and the Cosmologically Relevant Region of MSSM Parameter Space
• Indirect search for dark matter with micrOMEGAs2.4
• Neutralino-Stau Coannihilation and the Cosmological Upper Limit on the Mass of the Lightest Supersymmetric Particle
• Sommerfeld factor for arbitrary partial wave processes
• Supersymmetric Cold Dark Matter with Yukawa Unification
• Light Higgsino Dark Matter
• The Sommerfeld enhancement for dark matter with an excited state
• Sommerfeld enhancement: general results from field theory diagrams
• Dark Matter Relic Abundance and Scalar-Tensor Dark Energy
• Relic densities including Sommerfeld enhancements in the MSSM
• Coupled Boltzmann calculation of mixed axion/neutralino cold dark matter production in the early universe
• Mass Degeneracy of the Higgsinos
• Constraints on the Very Early Universe from Thermal WIMP Dark Matter
• Neutralino, axion and axino cold dark matter in minimal, hypercharged and gaugino AMSB
• Potentially Large One-loop Corrections to WIMP Annihilation

Cited by in corpus (5)

• Non-relativistic pair annihilation of nearly mass degenerate neutralinos and charginos II. P-wave and next-to-next-to-leading order S-wave coefficients
• Neutralino Dark Matter in Scenarios with Early Matter Domination
• Theoretical uncertainty of the supersymmetric dark matter relic density from scheme and scale variations
• One-loop corrections to gaugino (co-)annihilation into quarks in the MSSM
• Non-relativistic pair annihilation of nearly mass degenerate neutralinos and charginos III. Computation of the Sommerfeld enhancements