A Model of Baryons Made of Quarks with Hidden Spin

Phenomenological quark model for baryon magnetic moments and beta decay ratios(GA/GV)

“…The original static quark model (SQM) made predictions for baryon magnetic moments [1][2][3] that were in remarkable qualitative agreement with early magnetic moment measurements. However, more accurate measurements of the magnetic moments of the baryon octet differ from the SQM predictions by up to 0.2 nuclear magnetons.…”

“…However, subsequent tests of the sum rules showed that they disagreed with experiment by more than did any single magnetic moment [6]. The violation of the sum rules indicates that strong SU (3) breaking and baryon dependent non-static contributions are required for baryon magnetic moments.…”

“…These are listed in the Appendix of Ref. [3]. (At that early stage of the quark model, the possibility of a ground state with orbital angular momentum had not been ruled out, and this resulted in the angular momentum l 0 appearing in the angular states.…”

“…This state is listed as state (5) in Ref. [3]. It is sometimes referred to as the S ′ state because it has no total orbital angular momentum.…”

Relativistic Spin–Flavor States in Light Front Dynamics

“…The Dirac spinors for the quarks have been omitted for simplicity. These spin-isospin states are symmetrized in the uds basis [17], where quarks are treated as distinguishable; if the third quark is taken to be the down quark, then the up quarks are symmetrized explicitly in the spin-flavor wave function. That is why the isospin operator is chosen so as to make the (12) matrix element symmetric under 1 ↔ 2.…”