21-26 July 2014
Renold Building
Europe/London timezone
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New results on Sommerfeld enhancements and relic abundance of neutralino dark matter in the general MSSM

Presented by Martin BENEKE on 24 Jul 2014 from 14:45 to 15:00
Type: Particle Cosmology
Track: Particle Cosmology


We discuss the impact of Sommerfeld enhancements on the neutralino LSP relic abundance calculation for heavy neutralino dark matter including co-annihilations of nearly mass-degenerate neutralino and chargino states. Interesting regions in the MSSM parameter space are identified, focusing on heavy wino- and higgsino-like dark matter scenarios and models interpolating between the two cases. We investigate several benchmark scenarios in this part of the parameter space. Sommerfeld enhancements in all (co-)annihilation processes of (nearly) mass-degenerate neutralino and chargino states are considered, including P- and next-to-next-to-leading order S-wave annihilations. A newly developed method enables us in addition to treat effects from heavy states perturbatively in the Sommerfeld enhanced rates. Our generic analytic calculation of all (off)-diagonal potential and annihilation matrices allows for the first time a rigorous study of Sommerfeld enhancements in neutralino and chargino pair-annihilations in the general MSSM.


Location: Renold
Room: F14

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