One-loop corrections to neutralino-stop coannihilation revisited

Abstract

We discuss the $\mathcal{O}({\alpha }_s)$ supersymmetric QCD corrections to neutralino-stop coannihilation into a top quark and a gluon in the Minimal Supersymmetric Standard Model (MSSM). This particular channel can be numerically important in wide ranges of the MSSM parameter space with rather light stops. We discuss technical details such as the renormalization scheme and the phase-space slicing method with two cutoffs. We also comment on improvements with respect to earlier works on the given process. Further, we study for the first time the phenomenologically very interesting interplay of neutralino-stop coannihilation with neutralino-pair annihilation into quark pairs taking the full next-to-leading order SUSY-QCD corrections into account. We demonstrate that the numerical impact of these corrections on the total (co)annihilation cross section and finally on the theoretically predicted neutralino relic density is significant.

20 pages, 12 figures, 4 tables

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Cited by in corpus (7)

• Anatomy of Coannihilation with a Scalar Top Partner
• Higgs-mediated bound states in dark-matter models
• Superstring-Inspired Particle Cosmology: Inflation, Neutrino Masses, Leptogenesis, Dark Matter & the SUSY Scale
• SUSY-QCD corrections for the direct detection of neutralino dark matter and correlations with the relic density
• Squark-pair annihilation into quarks at next-to-leading order
• Stop Co-Annihilation in the Minimal Supersymmetric Standard Model Revisited
• Predicting the neutralino relic density in the MSSM more precisely