Nucleon Sigma Terms with $N_f = 2 + 1$ O($a$)-improved Wilson fermions
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arXiv
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| Autori principali: | , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2023
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| _version_ | 1866910298594607104 |
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| author | Agadjanov, Andria Djukanovic, Dalibor von Hippel, Georg Meyer, Harvey B. Ottnad, Konstantin Wittig, Hartmut |
| author_facet | Agadjanov, Andria Djukanovic, Dalibor von Hippel, Georg Meyer, Harvey B. Ottnad, Konstantin Wittig, Hartmut |
| contents | We present a lattice-QCD based analysis of the nucleon sigma terms using gauge ensembles with $N_f = 2 + 1$ flavors of ${\cal O}(a)$-improved Wilson fermions, with a complete error budget concerning excited-state contaminations, the chiral interpolation as well as finite-size and lattice spacing effects. We compute the sigma terms determined directly from the matrix elements of the scalar currents. The chiral interpolation is based on SU(3) baryon chiral perturbation theory using the extended on-mass shell renormalization scheme. For the pion nucleon sigma term, we obtain $σ_{πN} = (43.7\pm3.6)$ MeV, where the error includes our estimate of the aforementioned systematics. The tension with extractions based on dispersion theory persists at the 2.4-$σ$ level. For the strange sigma term, we obtain a non-zero value, $σ_s=(28.6\pm9.3)$ MeV. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2303_08741 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Nucleon Sigma Terms with $N_f = 2 + 1$ O($a$)-improved Wilson fermions Agadjanov, Andria Djukanovic, Dalibor von Hippel, Georg Meyer, Harvey B. Ottnad, Konstantin Wittig, Hartmut High Energy Physics - Lattice High Energy Physics - Phenomenology Nuclear Theory We present a lattice-QCD based analysis of the nucleon sigma terms using gauge ensembles with $N_f = 2 + 1$ flavors of ${\cal O}(a)$-improved Wilson fermions, with a complete error budget concerning excited-state contaminations, the chiral interpolation as well as finite-size and lattice spacing effects. We compute the sigma terms determined directly from the matrix elements of the scalar currents. The chiral interpolation is based on SU(3) baryon chiral perturbation theory using the extended on-mass shell renormalization scheme. For the pion nucleon sigma term, we obtain $σ_{πN} = (43.7\pm3.6)$ MeV, where the error includes our estimate of the aforementioned systematics. The tension with extractions based on dispersion theory persists at the 2.4-$σ$ level. For the strange sigma term, we obtain a non-zero value, $σ_s=(28.6\pm9.3)$ MeV. |
| title | Nucleon Sigma Terms with $N_f = 2 + 1$ O($a$)-improved Wilson fermions |
| topic | High Energy Physics - Lattice High Energy Physics - Phenomenology Nuclear Theory |
| url | https://arxiv.org/abs/2303.08741 |