Abstract: Pure wino dark matter, transforming as a triplet under the SU(2) group of the Standard Model, provides an illustrative example of heavy weakly-interacting dark matter that is not yet excluded by direct and collider searches. The most stringent constraints on wino dark matter come from astrophysical searches for its annihilation products. However, the thermal wino must be heavy relative to the weak scale, and as a consequence, precisely predicting its indirect signals requires going beyond standard fixed-order perturbative calculations; similar physics can also appear in dark sectors where the dark matter couples to much lighter force carriers. I will discuss how effective-field-theory techniques, originally developed in the context of QCD and collider physics, can be adapted to capture and resum large logarithms appearing in the annihilation spectrum, as well as the potential for annihilation through bound states. I will present a calculation of the complete resummed spectrum of hard photons produced by heavy wino annihilation, and show how current and future data from the H.E.S.S. experiment can constrain wino dark matter.
Hunting The Heavy Wino - Tracy Slatyer, MIT, 303 Jadwin
Tue, Feb 5, 2019, 4:00 pm