Model selection for K+E- photoproduction within an isobar model

0551765 - ÚJF 2022 RIV US eng J - Journal Article
Bydžovský, Petr - Cieplý, Aleš - Petrellis, Dimitrios - Skoupil, Dalibor - Zachariou, N.
Model selection for K+E- photoproduction within an isobar model.
Physical Review C. Roč. 104, č. 6 (2021), č. článku 065202. ISSN 2469-9985. E-ISSN 2469-9993
R&D Projects: GA ČR GA19-19640S; GA ČR GA19-14048S
Institutional support: RVO:61389005
Keywords : photoproduction * nucleon resonances * cross sections
OECD category: Atomic, molecular and chemical physics (physics of atoms and molecules including collision, interaction with radiation, magnetic resonances, Mössbauer effect)
Impact factor: 3.199, year: 2021
Method of publishing: Limited access
https://doi.org/10.1103/PhysRevC.104.065202

We utilize an isobar model to investigate the K+E- 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 A 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.
Permanent Link: http://hdl.handle.net/11104/0326988