Model selection for K+ ς- Photoproduction within an isobar model

Abstract

We utilize an isobar model to investigate the K+ς- 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 Δ 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.

Metadata

Authors/Creators:

BydŽovský, P.
Cieplý, A.
Petrellis, D.
Skoupil, D.
Zachariou, N. https://orcid.org/0000-0001-7621-5612

Funding Information: The authors would like to thank H. Haberzettl for drawing their attention to the LASSO method. This work was supported by the Czech Science Foundation GACR Grants No. 19-19640S (P.B., A.C., and D.S.) and No. 19-14048S (D.P.). © 2021 American Physical Society. Uploaded in accordance with the publisher’s self-archiving policy. Further copying may not be permitted; contact the publisher for details

Dates: