Publications
Publication Information
| Title | Baryon masses and sigma terms in SU(3) BChPT x 1/Nc |
| Authors | I. Fernando, Jose Goity |
| JLAB number | JLAB-THY-18-2679 |
| LANL number | (None) |
| Other number | DOE/OR/23177-4397 |
| Document Type(s) | (Journal Article) |
| Associated with EIC: | No |
| Supported by Jefferson Lab LDRD Funding: | No |
| Funding Source: | Nuclear Physics (NP) |
| Other Funding: | NSF |
|
Journal Compiled for Physics Letters B Volume 781 Page(s) 719-722 Refereed | |
| Publication Abstract: | Baryon masses and nucleon $\sigma$ terms are studied with the effective theory that combines the chiral and $1/N_c$ expansions for three flavors. In particular the connection between the deviation of the Gell-Mann-Okubo relation and the $\sigma$ term associated with the scalar density $\bar u u+\bar d d-2\bar s s$ is emphasized. The latter is at lowest order related to a mass combination whose low value has given rise to a $\sigma$ term puzzle. It is shown that while the nucleon $\sigma$ terms have a well behaved low energy expansion, that mass combination is affected by large higher order corrections non-analytic in quark masses. Adding to the analysis lattice QCD baryon masses, it is found that $\sigma_{\pi N}=69(10)$~MeV and $\sigma_s$ has natural magnitude within its relative large uncertainty. |
| Experiment Numbers: | other |
| Group: | THEORY CENTER |
| Document: | |
| DOI: | https://doi.org/10.1016/j.physletb.2018.04.054 |
| Accepted Manuscript: | 1-s2.0-S0370269318303484-main.pdf |
| Supporting Documents: | |
| Supporting Datasets: | |