Bali, Gunnar S. and Collins, Sara and Georg, Peter and Jenkins, Daniel and Korcyl, Piotr and Schaefer, Andreas and Scholz, Enno E. and Simeth, Jakob and Soeldner, Wolfgang and Weishaeupl, Simon (2023) Scale setting and the light baryon spectrum in <i>N<sub>f</sub></i>=2+1 QCD with Wilson fermions. JOURNAL OF HIGH ENERGY PHYSICS (5): 035. ISSN 1029-8479,
Full text not available from this repository. (Request a copy)Abstract
We determine the light baryon spectrum on ensembles generated by the Coordinated Lattice Simulations (CLS) effort, employing N-f = 2+ 1 flavours of non-perturbatively improved Wilson fermions. The hadron masses are interpolated and extrapolated within the quark mass plane, utilizing three distinct trajectories, two of which intersect close to the physical quark mass point and the third one approaching the SU(3) chiral limit. The results are extrapolated to the continuum limit, utilizing six different lattice spacings ranging from a approximate to 0.10 fm down to below 0.04 fm. The light pion mass varies from M-pi approximate to 429MeV down to 127MeV. In general, the spatial extent is kept larger than four times the inverse pion mass and larger than 2.3 fm, with additional small and large volume ensembles to investigate finite size effects. We determine the Wilson flow scales root t(0), ph = 0.1449((9))((7)) fm [ 1] and t(0)* approximate to t(0),ph [2] from the octet cascade (Xi baryon). Determining the light baryon spectrum in the continuum limit, we find the nucleon mass m(N) = 941.7((7.6)) (MeV)-Me-(6.5) and the other stable baryon masses to agree with their experimental values within sub-percent level uncertainties. Moreover, we determine SU(3) and SU(2) chiral perturbation theory low energy constants, including the octet and the Omega baryon sigma terms sigma N-pi = 43.9(4.7) MeV, sigma(pi Lambda) = 28.2((5.4))((4.3)) MeV, sigma(pi Sigma) = 25.9((6.1))((3.8)) MeV, sigma(pi Xi) = 11.2((6.4))((4.5)) MeV and sigma(pi Omega) = 6.9((4.3))((5.3)) MeV, as well as various parameters, renormalization factors and improvement coefficients that are relevant for simulations with our lattice action.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | CHIRAL PERTURBATION-THEORY; LATTICE QCD; HADRON SPECTRUM; UNITARY SYMMETRY; DELTA-RESONANCE; DECAY CONSTANTS; LEAST-SQUARES; MASS-SPECTRUM; NUCLEON; IMPROVEMENT; Lattice QCD; Hadronic Spectroscopy; Structure and Interactions; Chiral Lagrangian; Properties of Hadrons |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Theroretical Physics |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 19 Apr 2024 16:06 |
| Last Modified: | 19 Apr 2024 16:06 |
| URI: | https://pred.uni-regensburg.de/id/eprint/61645 |
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