Hyperon radiative decays in the bound state soliton model

Abstract

The radiative decays of hyperons are studied in the framework of the bound state soliton model. Detailed predictions for the total decay widths and the E2/M1 ratios corresponding to decuplet-to-octet electromagnetic transitions are presented in relation to future planned experiments at CE-BAF and Fermilab. The results are compared to those obtained in quark based models. † Fellow of the CONICET, Argentina.

Octet to decuplet electromagnetic transition in a relativistic quark model

“…Our results for the decay widths in Table VII are comparable with most of the predictions presented in the literature [11][12][13][14][15]17,[20][21][22][23][24]27,65]. The exception is the result for the Á !…”

“…The operator j q has the generic structure [34,37,39,53], 20) where M N is the nucleon mass and j i (i ¼ 1, 2) are flavor operators acting on the third quark in the jM A i or jM S i wave functions. For the quark current we use, Note that the values for the quark anomalous magnetic moments q , defined according to Eq.…”

Electromagnetic decay of theΣ0(1385)toΛγ

“…Note that a large part of the uncertainty in Eq. (17) comes from the uncertainty of the full width Γ(Σ * 0 ) Full .…”

“…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.…”