Münster 2017 – scientific programme

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T: Fachverband Teilchenphysik

T 41: Beyond the Standard Model (Theorie) 2

T 41.5: Talk

Tuesday, March 28, 2017, 12:00–12:15, VSH 19

Neutralino annihilation into a pair of gluons with DMNLO — Michael Klasen, Karol Kovarik, and •Oleh Fedkevych — Institute for Theoretical Physics, Wilhelm-Klemm-Str. 9 48149 Muenster Germany

The Minimal Supersymmetric Standard Model (MSSM) is a well-motivated extension of the Standard Model with enlarged space-time symmetry group and a rich particle spectrum. If R-parity is conserved, the lightest MSSM particle cannot decay and represents a good cold dark matter (CDM) candidate. A precise understanding of MSSM
(co-)annihilation processes is then crucial to explain the amount of CDM we currently observe in the Universe.

The DM@NLO code is a numerical tool to compute (co-)annihilation cross-sections in the MSSM at next-to-leading order in α_S. The current version includes the following classes of processes:
Gaugino pair-annihilation into quark pairs,
gaugino-squark coannihilation into a quark and a gauge or Higgs boson, and
squark-antisquark annihilation into electroweak final states.

We report on the implementation of neutralino annihilation into a pair of gluons. The corresponding one-loop diagrams are computed and implemented using the Passarino-Veltman reduction technique. We explore the importance of this process for the determination of relic density in the MSSM.