Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8186724 | Physics Letters B | 2018 | 4 Pages |
Abstract
Baryon masses and nucleon Ï terms are studied with the effective theory that combines the chiral and 1/Nc expansions for three flavors. In particular the connection between the deviation of the Gell-Mann-Okubo relation and the Ï term associated with the scalar density u¯u+d¯dâ2s¯s is emphasized. The latter is at lowest order related to a mass combination whose low value has given rise to a Ï term puzzle. It is shown that while the nucleon Ï 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 ÏÏN=69(10) MeV and Ïs has natural magnitude within its relatively large uncertainty.
Keywords
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Nuclear and High Energy Physics
Authors
I.P. Fernando, J.M. Alarcón, J.L. Goity,