Nucleon sigma terms with a variational analysis from Lattice QCD
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arXiv
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| Format: | Preprint |
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2024
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| author | Barca, Lorenzo Bali, Gunnar Collins, Sara |
| author_facet | Barca, Lorenzo Bali, Gunnar Collins, Sara |
| contents | We determine the nucleon-sigma terms from lattice 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 analyse a single $N_f=3$ ensemble with the unphysically large pion mass $M_π=429$ MeV. Excited state contamination is substantially reduced compared to the standard method when employing nucleon-sigma type interpolating operators within a generalised eigenvector analysis. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2412_13138 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Nucleon sigma terms with a variational analysis from Lattice QCD Barca, Lorenzo Bali, Gunnar Collins, Sara High Energy Physics - Lattice We determine the nucleon-sigma terms from lattice 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 analyse a single $N_f=3$ ensemble with the unphysically large pion mass $M_π=429$ MeV. Excited state contamination is substantially reduced compared to the standard method when employing nucleon-sigma type interpolating operators within a generalised eigenvector analysis. |
| title | Nucleon sigma terms with a variational analysis from Lattice QCD |
| topic | High Energy Physics - Lattice |
| url | https://arxiv.org/abs/2412.13138 |