Quark Model Explanation of the $N^*\to Nη$ Branching Ratios

Details Quark Model Explanation of the $N^*\to Nη$ Branching Ratios Quark Model Explanation of the $N^*\to Nη$ Branching Ratios

1995-08-18

arxiv.org/abs/hep-ph/9508327v1

Phys.Lett. B366 (1996) 305-310

Physics

High Energy Physics

High Energy Physics - Phenomenology

Latex 7 p, no figures

Scientific paper

10.1016/0370-2693(95)01369-5

The constituent quark model can explain the strong selectivity of the $N\eta$ decay branching ratios of the nucleon resonances if the fine structure interaction between the constituent quarks is described in terms of Goldstone boson exchange. This chiral quark model predicts that the resonances $N(1535)$, $N(1710)$, $\Lambda(1670)$, $\Sigma(1750)$, which have mixed flavor and spin symmetry $[21]_{FS} [21]_F [21]_S$ wavefunctions in lowest order, should have large $N\eta$ branching ratios, while $N\eta$ decay of the other resonances that have different flavor-spin symmetry should be strongly suppressed in agreement with the experimental branching ratios.

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