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The strange quark scalar content plays an important role in both thedescription of nucleon structure and in the determination of dark matter directdetection cross sections. As a measure of the strange-quark contribution to thenucleon mass, the strange-quark sigma term (\sigma_s) provides importantinsight into the nature of mass generation in QCD. The phenomenologicaldetermination of \sigma_s exhibits a wide range of variation, with valuessuggesting that the strange quark contributes anywhere between 0 and more than30% of the nucleon mass. In the context of dark matter searches, coupled withrelatively large Higgs coupling to strangeness, this variation dominates theuncertainty in predicted cross sections for a large class of dark mattermodels. Here we report on the recent results in lattice QCD, which are nowgiving a far more precise determination of \sigma_s than can be inferred fromphenomenology. As a consequence, the lattice determinations of \sigma_s can nowdramatically reduce the uncertainty in dark matter cross sections associatedwith the hadronic matrix elements.

Strange quark content of the nucleon and dark matter searches