Multipole approach for photo- and electroproduction of kaon

TL;DR

This paper applies a multipole approach to analyze kaon photo- and electroproduction data, highlighting inconsistencies between datasets and exploring implications for missing resonances.

Contribution

It introduces a gauge-invariant, crossing-symmetric multipole analysis of kaon production data, addressing dataset discrepancies and extending to electroproduction.

Findings

Identified inconsistencies between SAPHIR and CLAS data.

Extended analysis to finite Q^2 electroproduction data.

Highlighted implications for missing resonance interpretations.

Abstract

We have analyzed the experimental data on K+Lambda photoproduction by using a multipole approach. In this analysis we use the background amplitudes constructed from appropriate Feynman diagrams in a gauge-invariant and crossing-symmetric fashion. Results of our analysis reveal the problem of mutual consistency between the new SAPHIR and CLAS data. We found that the problem could lead to different conclusions on ``missing resonances''. We have also extended our analysis to the finite Q^2 region and compared the result with the corresponding electroproduction data.