PoS - Proceedings of Science
Volume 430 - The 39th International Symposium on Lattice Field Theory (LATTICE2022) - Hadron Structure
Sigma terms of the baryon octet in $N_\mathrm{f} = 2+1$ QCD with Wilson quarks
P.L.J. Petrak*, G. Bali, S. Collins, J. Heitger, D. Jenkins and S. Weishäupl
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Pre-published on: January 29, 2023
Published on: April 06, 2023
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
${0.098}\,\mathrm{fm}$ and ${0.039}\,\mathrm{fm}$. We present some preliminary results for the pion and strange sigma terms and compare to indirect determinations. To do so, we discuss multi-state fits to tackle the well-known problem of excited state contamination comparing the ratio and summation methods also including priors.
DOI: https://doi.org/10.22323/1.430.0112
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