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We present a calculation of the nucleon sigma term on two-flavor QCDconfigurations with dynamical overlap fermions. We analyse the lattice data forthe nucleon mass using the baryon chiral perturbation theory. Using partiallyquenched data sets, we extract the connected and disconnected contributions tothe nucleon sigma term separately. Chiral symmetry on the lattice simplifiesthe determination of the disconnected contribution. We find that the strangequark content, which determines the neutralino dark matter reaction rate withnucleon through the Higgs boson exchange, is much smaller than the previouslattice results.

Calculation of the nucleon sigma term and strange quark content with two flavors of dynamical overlap fermions