The strange quark condensate in the nucleon in 2+1 flavor QCD

Abstract

We calculate the "strange quark content of the nucleon", <N| s s_bar |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 s_bar |N> = 0.69 +- 0.07(statistical) +- 0.09(systematic), in the modified minimal subtraction scheme (2 GeV), or for the renormalization scheme invariant form, m_s partial{M_N}/partial{m_s} = 59(6)(8) MeV.

Added figures and references, especially for fit range choice. Other changes for clarity. Version to appear in publication

References in corpus (4)

• Hadronic Uncertainties in the Elastic Scattering of Supersymmetric Dark Matter
• Nucleon sigma term and strange quark content from lattice QCD with exact chiral symmetry
• Chiral extrapolations of baryon masses for unquenched three-flavor lattice simulations
• Determination of Dark Matter Properties at High-Energy Colliders

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