Speaker
Description
A lot of progress has been made in the direct determination of nucleon sigma terms. Using similar methods we consider the sigma terms of the other octet baryons as well. These are determined on CLS gauge field ensembles employing the Lüscher-Weisz gluon action and the Sheikholeslami-Wohlert fermion action with $N_\mathrm{f} = 2 + 1$. The ensembles have pion masses ranging from ${410}\,\mathrm{MeV}$ down to the physical value and lattice spacings covering a range between ${0.039}\,\mathrm{fm}$ and ${0.098}\,\mathrm{fm}$. We present a preliminary chiral extrapolation for $a\approx 0.06$ fm along a trajectory where the sum of the sea quark masses is kept constant. We discuss multi-state fits to tackle the well-known problem of excited state contamination comparing ratio and summation method.
