Model selection for $K^+\Sigma^-$ photoproduction within isobar model

Ale\v{s} Ciepl\'y; Dalibor Skoupil; Dimitrios Petrellis; Nicholas Zachariou; Petr Byd\v{z}ovsk\'y

Model selection for $K^+\Sigma^-$ photoproduction within isobar model

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arxiv 2106.15199 v1 pith:G5Q3GYAP submitted 2021-06-29 nucl-th

Petr Bydžovský , Aleš Cieplý , Dimitrios Petrellis , Dalibor Skoupil , Nicholas Zachariou This is my paper · ORCID

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keywords datamodelresonancesachievedescriptionisobarphotoproductionresonance

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abstract

We utilise an isobar model to investigate the $K^+ \Sigma^-$ photoproduction off a neutron in the resonance region. Except for the Born terms, we include high-spin (spin-3/2 and spin-5/2) nucleon resonances in the consistent formalism together with a few $\Delta$ and kaon resonances to achieve an acceptable agreement with data. Interestingly, we reveal that no hyperon resonances are needed to achieve a reasonable description of data. On the other hand the $N(1720)3/2^+$ resonance was found to be very important for correct description of data. The free parameters of the model were fitted to experimental data from the LEPS and CLAS Collaborations on either differential cross sections or photon beam asymmetry. The novel feature of the fitting procedure is the use of a regularization method, the Least Absolute Shrinkage Selection Operator, and information criteria in order to choose the best fit.

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