English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Tools annual

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Presents the access of premium content as premium feature

Premium Content

Global: Zendy Plus annual

Global: Zendy Free Plan

We study the nucleon and three N* resonances' properties in an effectivelinear realization chiral SU_L(2) x SU_R(2) and U_A(1) symmetric Lagrangian. Weplace the nucleon fields into the so-called "naive" (1/2,0) + (0, 1/2) and"mirror" (0, 1/2) + (1/2,0) (fundamental) representations of SU_L(2) x SU_R(2),two of each -distinguished by their U_A(1) chiral properties, as defined by anexplicit construction of the nucleon interpolating fields in terms of threequark (Dirac) fields. We construct the most general one-meson-baryon chiralinteraction Lagrangian assuming various parities of these four nucleon fields.We show that the observed masses of the four lowest lying nucleon states can bewell reproduced with the effective Lagrangian, after spontaneous symmetrybreakdown, without explicit breaking of U_A(1) symmetry. This does not meanthat explicit U_A(1) symmetry breaking does not occur in baryons, but ratherthat it does not have a unique mass prediction signature that exists e.g. inthe case of spinless mesons. We also consider briefly the axial couplings withchiral representation mixing.

A Lagrangian for the Chiral (1/2,0) + (0,1/2) Quartet Nucleon Resonances