Lattice QCD at physical pion mass with Nf=2+1+1 twisted mass fermions yields g_A^{u-d}=1.286(23), sigma_piN=41.6(3.8) MeV and per-flavor charges including charm.
Strangeness of the nucleon from Lattice Quantum Chromodynamics
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We present a non-perturbative 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 were able to quantify in this work.
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Nucleon axial, tensor and scalar charges and $\sigma$-terms in lattice QCD
Lattice QCD at physical pion mass with Nf=2+1+1 twisted mass fermions yields g_A^{u-d}=1.286(23), sigma_piN=41.6(3.8) MeV and per-flavor charges including charm.