Neutralino annihilation processes in the minimal supergravity model
arXiv:0806.2214
Abstract
We study all tree-level neutralino annihilation processes concerning energy-dependence at the mSUGRA benchmark point SPS1a using tree-level calculators MadGraph and CompHEP as well as FormCalc. We further investigate the total tree-level neutralino annihilation cross section by scanning over the mSUGRA parameters and identifying the dominant channels in every region. The results for the cross sections are presented in the m1/2-m0 planes for different values of tan(beta) and A0. We identify as well the resonances due to the exchange of the heavy Higgs bosons A and H in the s-channel of many neutralino annihilation processes, where the total cross section increases significantly if these Higgs bosons can be produced close to on-shell. Finally, we provide a few comments on the neutralino annihilation processes at loop-level.
22 pages, 36 figures
References in corpus (8)
- Automatized One-Loop Calculations in 4 and D dimensions
- Three Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Polarization Analysis
- MadGraph/MadEvent v4: The New Web Generation
- MadEvent: Automatic Event Generation with MadGraph
- Neutralino Relic Density including Coannihilations
- The Snowmass Points and Slopes: Benchmarks for SUSY Searches
- Supersymmetric Dark Matter in Light of WMAP
- SUSY constraints from relic density: high sensitivity to pre-BBN expansion rate