title: Heavy dark matter annihilation from effective field theory.
abstract: We formulate an effective field theory description for SU(2)_{L} triplet fermionic dark matter by combining nonrelativistic dark matter with gauge bosons in the soft-collinear effective theory. For a given dark matter mass, the annihilation cross section to line photons is obtained with 5% precision by simultaneously including Sommerfeld enhancement and the resummation of electroweak Sudakov logarithms at next-to-leading logarithmic order. Using these results, we present more accurate and precise predictions for the gamma-ray line signal from annihilation, updating both existing constraints and the reach of future experiments.
authors.affiliation: Physics Department, University of Massachusetts Amherst, Amherst, Massachusetts 01003, USA.
authors.forename: Grigory
authors.initials: G
authors.lastname: Ovanesyan
authors.affiliation: Center for Theoretical Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
authors.forename: Tracy R
authors.initials: TR
authors.lastname: Slatyer
authors.affiliation: Center for Theoretical Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
authors.forename: Iain W
authors.initials: IW
authors.lastname: Stewart