The strange quark condensate in the nucleon in 2+1 flavor QCD
Abstract
We calculate the "strange quark content of the nucleon", <N| s sbar |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 strange quarks. After continuum and chiral extrapolations, the result is <N |s sbar |N> = 0.69 +- 0.07(statistical) +- 0.09(systematic), in the modified minimal subtraction scheme (2 GeV), or for the renormalization scheme invariant form, ms partialMN/partialms = 59(6)(8) MeV.
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