Studying two-body nonleptonic weak decays of hyperons with topological diagram approach

Abstract

Many decays of light baryons consisting of light u, d, s quarks have been measured, and these measurements will help us to understand the decay properties of light baryons. In this work, we study two-body nonleptonic weak decays of light baryon octets (T8) and baryon decuplets (T10) by the topological diagram approach (TDA) under the SU(3) flavor symmetry for the first time. We find that () the TDA and the SU(3) irreducible representation approach (IRA) match consistently in (P8 is the light pseudoscalar meson octet); (2) almost all relevant not-yet-measured may be predicted by using three experimental data of , and the upper limits of may be obtained from the experimental upper limit of by both the TDA and the IRA together, nevertheless, all new predicted branching ratios are too small to be reached in current experiments; (3) T8 → T8′P8 decays are quite complex in terms of the TDA, and we find that W-exchange diagrams give large and even dominant contributions by using relevant experimental data and the isospin relations.