Electromagnetic properties of hyperons in a relativised quark model

Nucleon and Δ resonances inKΣ(1385)photoproduction from nucleons

“…For the intermediate (1193) hyperon, there is no experimental data for ( (1385) → (1193)γ ). However, most hadron model calculations show that the decay width of (1385) → (1193)γ is less than 10% of that of (1385) → (1116)γ [26,27]. With g KN = 3.58 from the flavor SU(3) symmetry, we have estimated that the contribution from the u-channel (1193) is only at the level of 0.5% of the u-channel (1116) contribution.…”

“…To estimate the relative strength of the two coupling constants, we make use of the quark model result of Ref. [26] for the helicity amplitudes A 1/2 and A 3/2 (see Appendix B), which gives the ratio A 3/2 /A 1/2 ≈ 1.82. 2 Combining this information, we obtain…”

Radiative decay of theΛ*(1520)

“…However, as said above, it is precisely the γΣ 0 (1193) final state which in our hadronic interaction picture appears enhanced. We should also mention other quark models [14,15,16,17] that enlarge and complement Ref. [13], as well as algebraic models [18] where the Λ(1520) radiative decay has been evaluated.…”

Electromagnetic decay of theΣ0(1385)toΛγ

“…There are many theoretical calculations of the EM decays of decuplet hyperons such as: the non-relativistic quark model (NRQM) [12,13], a relativized constituent quark model (RCQM) [14], a chiral constituent quark model (χCQM) [15], the MIT bag model [16], the boundstate soliton model [17], a three-flavor generalization of the Skyrme model that uses the collective approach [18,19], an algebraic model of hadron structure [20], and heavy baryon chiral perturbation theory (HBχPT) [21], among others. Table I summarizes the theoretical predictions and experimental branching ratios for the EM transitions of interest.…”

“…Table I summarizes the theoretical predictions and experimental branching ratios for the EM transitions of interest. [14] 4.1 267 χCQM [15] 350 265 MIT Bag [16] 4.6 152 Soliton [17] 243 Skyrme [18,19] 309-326 157-209 Algebraic model [20] 341 A comprehensive study of electromagnetic strangeness production has been undertaken using the CLAS detector at the Thomas Jefferson National Accelerator Facility. Many data on ground-state hyperon photoproduction have already been published [22][23][24] using data from the CLAS run group g1 and g11 data sets.…”