T-2, Nuclear and Particle Physics, Astrophysics and Cosmology

Electroweak corrections and dark matter indirect detection

Grigory Ovanesyan
UMass Amherst

We consider heavy wino Dark Matter (DM) annihilation cross section to two photons. This is the signal for indirect detection of DM. When DM mass is much heavier than the electroweak scale, the next-to-leading order electroweak corrections to the annihilation rate have Sudakov large double logarithms. Because of this such corrections become of the order of 30% for DM mass of the order of couple of TeV and of the order of factor of 2-3 for 100 TeV DM. Using Soft-Collinear Effective theory (SCET) adapted for SU(2) gauge group, we resum to next-to-leading logarithmic order the electroweak corrections to wino-DM annihilation rate. We compare our results to existing fixed order calculations and discuss phenomenology for DM indirect detection.


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