Photoproduction of Λ* and Σ* resonances with JP=1/2- off the proton

We study the photoproduction of the Lambda(1405) and Sigma(1400) hyperon resonances, the latter of which is not a well established state. We evaluate the s-, t-, and u-channel diagrams in the Born approximation by employing the effective Lagrangians. A new ingredient is the inclusion of a nucleon resonance N* (1895) that is dynamically generated with predictions for its coupling to the K Sigma(1405) and K Sigma(1400) channels. To extend the applicability of the model to energies beyond the threshold region, we consider a Regge model for the t-channel K- and K* -exchanges. Our results are in good agreement with the CLAS data available on Lambda(1405), while for Sigma(1400) we predict observables for its production. We also provide polarization observables for both hyperon productions, which can be useful in future experimental investigations. The present study provides new information on the nucleon resonance N*(1895) which can be an alternative source for generating the hyperon resonances Lambda(1405) and Sigma(1400).

Automated summary

The study investigates the photoproduction of the Lambda(1405) and Sigma(1400) hyperon resonances, predicting observables for their production and providing polarization observables for both hyperon productions, offering new information for future experimental investigations.