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Sigma terms of the baryon octet in $N_\mathrm{f} = 2+1$ QCD with Wilson quarks

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arxiv 2301.03871 v1 pith:LH6Y7HNF submitted 2023-01-10 hep-lat

Pia Leonie Jones Petrak , Gunnar Bali , Sara Collins , Jochen Heitger , Daniel Jenkins , Simon Weishäupl This is my paper · ORCID
classification hep-lat
keywords mathrmsigmatermsactionensemblesmethodsoctetpion
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abstract

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 L\"uscher-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.

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  1. Nucleon sigma terms with a variational analysis from Lattice QCD

    hep-lat 2024-12 conditional novelty 6.0 of 10

    A variational basis with nucleon-sigma interpolators reduces excited state contamination in direct lattice QCD determinations of nucleon sigma terms, demonstrated on one Nf=3 ensemble at M_pi=429 MeV.

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