Barca, Lorenzo and Bali, Gunnar and Collins, Sara (2025) Nucleon sigma terms with a variational analysis from Lattice QCD. PHYSICAL REVIEW D, 111 (3): L031505. ISSN 2470-0010, 2470-0029
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We determine the nucleon-sigma terms from lattice quantum chromodynamics (QCD). We find that the dominant excited state contamination in the nucleon three-point function with a scalar current is due to the transition between the nucleon and a S-wave scattering state of a nucleon and a scalar (sigma) meson. In this proof-of-concept study, we analyze a single Nf = 3 ensemble with the unphysically large pion mass Mn = 429 MeV. Excited state contamination is substantially reduced compared to the standard method when employing nucleon-sigma type interpolating operators within a generalized eigenvector analysis.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | NON-SINGLET |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Theroretical Physics > Chair Professor Schäfer > Group Gunnar Bali |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 16 Jul 2026 05:55 |
| Last Modified: | 16 Jul 2026 05:55 |
| URI: | https://pred.uni-regensburg.de/id/eprint/66606 |
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