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

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

2009-05-14

arxiv.org/abs/0905.2432v2

Phys.Rev.Lett.103:122002,2009

Physics

High Energy Physics

High Energy Physics - Lattice

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

Scientific paper

10.1103/PhysRevLett.103.122002

We calculate the "strange quark content of the nucleon", , 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 = 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.

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