micrOMEGAs 2.0.7: a program to calculate the relic density of dark matter in a generic model

Abstract

micrOMEGAs 2.0 is a code which calculates the relic density of a stable massive particle in an arbitrary model. The underlying assumption is that there is a conservation law like R-parity in supersymmetry which guarantees the stability of the lightest odd particle. The new physics model must be incorporated in the notation of CalcHEP, a package for the automatic generation of squared matrix elements. Once this is done, all annihilation and coannihilation channels are included automatically in any model. Cross-sections at v = 0, relevant for indirect detection of dark matter, are also computed automatically. The package includes three sample models: the minimal supersymmetric standard model (MSSM), the MSSM with complex phases and the NMSSM. Extension to other models, including non supersymmetric models, is described.

Enhanced diphoton rates at Fermi and the LHC

“…For the calculation of the relic density of the lightest neutralino as well as to obtain σv γγ we have used MicrOmegas [91][92][93]. For this purpose we created model files for eters are read from the spectrum file written by SPheno using the SLHA+ functionality of…”

Thermal relic abundances of long-lived staus

“…5 and 6. The second version allows for a direct comparison with the existing computer code micrOMEGAs 2.0.6 [53,54,67]. We have transcribed their routine [68] for the computation of the running quark masses to Fortran, adopted all q k q k -Higgs couplings, and modified all Higgs-self couplings of our matrix elements to match with their implemented version of the MSSM [69].…”

“…In contrast, the most striking findings of our study-in which Sommerfeld enhancement is not taken into account-are related to the Higgs sector of the MSSM. At this point, we should also stress that the micrOMEGAs code [53,54,55,56] allows for sophisticated calculations of the thermal relic stau abundance also in regions in which coannihilation effects become important. In fact, micrOMEGAs has already been applied in several studies to calculate Y e τ [38,40,57,42,52].…”

The electroweak sector of the NMSSM at the one-loop level

“…We compute the relic density of the lightest neutralino using the public program package micrOMEGAs 2.4.O [48]. To this end, we have implemented the NMSSM particle content and corresponding interactions into a model file for CalcHEP [49], which is used by micrOMEGAs to evaluate the (co)annihilation cross-section.…”