Squark-pair annihilation into quarks at next-to-leading order

Abstract

The Minimal Supersymmetric Standard Model (MSSM) is under intense scrutiny at the LHC and in dark matter searches. Interestingly, scenarios with light squarks of the third generation remain not only viable, but also well motivated by the observed Standard-Model-like Higgs boson mass and dark matter relic density. The latter often requires important contributions from squark pair annihilation. Following up on previous work, we present in this paper a precision analysis of squark pair annihilation into quarks at next-to-leading order of QCD including Sommerfeld enhancement effects. We discuss all technical details of our one-loop, real emission and resummation calculations, their implementation in the precision tool DM@NLO, as well as the numerical impact on the annihilation cross section and cosmological relic density in phenomenological MSSM scenarios respecting in particular current LHC constraints. We demonstrate that including these radiative corrections leads to substantial shifts in the preferred parameter regions by up to 20 GeV.

23 pages, 15 figures

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Cited by in corpus (6)

• Impact of Sommerfeld Effect and Bound State Formation in Simplified $t$-Channel Dark Matter Models
• Precision predictions for dark matter with DM@NLO in the MSSM
• Dark Matter in the CP-violating NMSSM
• The dipole formalism for massive initial-state particles and its application to dark matter calculations
• Radiative corrections to stop-antistop annihilation into gluons and light quarks
• The Forward Physics Facility at the High-Luminosity LHC