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Radiative corrections to co-annihilation processes · Around

2007

Radiative corrections to co-annihilation processes

Freitas, A.

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In co-annihilation scenarios, the weakly interacting dark matter particle (WIMP) is close in mass to another particle that can decay into the WIMP.

As a result, both particles freeze out at roughly the same time in the early universe, and both contribute to the effective dark matter annihilation cross-section.
Since the heavier particle does not need to be weakly interacting, the co-annihilation processes are in general subject to sizeable radiative corrections.
Here this is analyzed for the example of neutralino-stop co-annihilation in supersymmetry.

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