Abstract
We have updated our previous multipoles model for the kaon photoproduction process by using the recently available experimental data, including the new CLAS 2016 data, and up-to-date information on the nucleon resonance properties provided by the Particle Data Group (PDG). The background and resonance parameters are extracted by fitting the calculated observables to nearly 7400 experimental data points and constraining the resonance parameters within the PDG error bars. The model can nicely reproduce the experimental data with . Different from the previous result, the present analysis finds the , and states to be the most important resonances in the process. Excluding these states in the model increases the value of tremendously. As in our previous model, however, the contribution of the state in minimizing is found to be less significant. By including the new CLAS 2016 data in the fitting database and refitting the calculated observables to nearly 9000 data points, the increases to 2.88. In spite of the increase of , the agreement of model calculations with the new data is improved and the conclusion on the most important resonances in the process remains the same. An extensive comparison between the result of model calculations and experimental data on differential cross section, single polarization observables , and , as well as double polarization observables , and , is presented in this paper.
8 More- Received 2 February 2017
DOI:https://doi.org/10.1103/PhysRevC.95.045205
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