Strange quark condensate in the nucleon in 2 + 1 flavor QCD.
We calculate the "strange quark content of the nucleon," <N|s[over]s|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|s[over]s|N> = 0.69(7)_{stat}(9)_{syst}, in the modified minimal subtraction scheme (2 GeV) regularization, or for the renormalization scheme invariant form, m_{s} partial differentialM_{N}/ partial differentialm_{s} = 59(6)(8) MeV.
Department of Physics, University of Arizona, Tucson, Arizona 85721, USA.
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Freeman