Strange quark condensate in the nucleon in 2+1 flavor QCD

We calculate the "strange quark content of the nucleon," N|s̄s|N, which is important for interpreting the results of some dark matter detection experiments. The method is to evaluate quark-line disconnected correlations on the MILC lattice ensembles, which include the effects of dynamical light and strange quarks. After continuum and chiral extrapolations, the result is N|s̄s|N=0.69(7)stat(9)syst, in the modified minimal subtraction scheme (2 GeV) regularization, or for the renormalization scheme invariant form, ms∂MN∂ms=59(6)(8)MeV.