Wino potential and Sommerfeld effect at NLO

We calculate the SU(2)xU(1) electroweak static potential between a fermionic triplet in the broken phase of the Standard Model in the one-loop order (NLO). The one-loop correction provides the leading non-relativistic correction to the large Sommerfeld effect in the annihilation of wino or wino-like dark matter particles chi(0). We find sizeable modifications of the chi(0) chi(0) annihilation cross section and determine the shifts of the resonance locations due to the loop correction to the wino potential. (C) 2019 The Authors. Published by Elsevier B.V.