We present a nonperturbative calculation of the strangeness of the nucleon $y_N$ within the framework of lattice QCD. This observable is known to be an important cornerstone to interpret results from direct dark matter detection experiments. We perform a lattice computation for $y_N$ with an analysis of systematic effects originating from discretization, finite size, chiral extrapolation and excited state effects leading to the value of $y_N=0.173(50)$. The rather large uncertainty of this value of $y_N$ is dominated by systematic uncertainties which we are able to quantify in this work.

• Received 7 October 2013

DOI:https://doi.org/10.1103/PhysRevD.91.094503