WIMP-nucleon scattering with heavy WIMP effective theory

Abstract

The discovery of a Standard Model-like Higgs boson and the hitherto absence of evidence for other new states may indicate that if WIMPs comprise cosmological dark matter, they are heavy compared to electroweak scale particles, $M\gg m_{W^{\pm }},m_{Z^0}$. In this limit, the absolute cross section for a WIMP of given electroweak quantum numbers to scatter from a nucleon becomes computable in terms of Standard Model parameters. We develop effective field theory techniques to analyze the heavy WIMP limit of WIMP-nucleon scattering, and present the first complete calculation of the leading spin-independent cross section in Standard Model extensions consisting of one or two electroweak $SU(2{)}_W\times U(1{)}_Y$ multiplets.

Comments: 5 pages, 5 figures. v2: modified discussion, additional section with 1 figure, PRL version