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We apply effective field theory methods to compute bino-nucleon scattering,in the case where tree-level interactions are suppressed and the leadingcontribution is at loop order via heavy flavor squarks or sleptons. We findthat leading log corrections to fixed-order calculations can increase the binomass reach of direct detection experiments by a factor of two in some models.These effects are particularly large for the bino-sbottom coannihilationregion, where bino dark matter as heavy as 5-10 TeV may be detected by nearfuture experiments. For the case of stop- and selectron-loop mediatedscattering, an experiment reaching the neutrino background will probe thermalbinos as heavy as 500 and 300 GeV, respectively. We present three key examplesthat illustrate in detail the framework for determining weak scalecoefficients, and for mapping onto a low energy theory at hadronic scales,through a sequence of effective theories and renormalization group evolution.For the case of a squark degenerate with the bino, we extend the framework toinclude a squark degree of freedom at low energies using heavy particleeffective theory, thus accounting for large logarithms through a "heavy-lightcurrent." Benchmark predictions for scattering cross sections are evaluated,including complete leading order matching onto quark and gluon operators, and asystematic treatment of perturbative and hadronic uncertainties.

The Bino Variations: Effective Field Theory Methods for Dark Matter Direct Detection