Photo- and electroproduction of K+ Lambda with a unitarity-restored isobar model

0488729 - ÚJF 2019 RIV US eng J - Článek v odborném periodiku
Skoupil, Dalibor - Bydžovský, Petr
Photo- and electroproduction of K+ Lambda with a unitarity-restored isobar model.
Physical Review C. Roč. 97, č. 2 (2018), č. článku 025202. ISSN 2469-9985. E-ISSN 2469-9993
Grant CEP: GA ČR(CZ) GA15-04301S
Institucionální podpora: RVO:61389005
Klíčová slova: kaon photoproduction * electromagnetic produciton * K+ Lambda
Obor OECD: Atomic, molecular and chemical physics (physics of atoms and molecules including collision, interaction with radiation, magnetic resonances, Mössbauer effect)
Impakt faktor: 3.132, rok: 2018

Exploiting the isobar model, kaon photo- and electroproduction on the proton in the resonance region comes under scrutiny. An upgrade of our previous model, comprising higher-spin nucleon and hyperon exchanges in the consistent formalism, was accomplished by implementing energy-dependent widths of nucleon resonances, which leads to a different choice of hadron form factor with much softer values of cutoff parameter for the resonant part. For a reliable description of electroproduction, the necessity of including longitudinal couplings of nucleon resonances to virtual photons was revealed. We present a new model whose free parameters were adjusted to photo- and electroproduction data and which provides a reliable overall description of experimental data in all kinematic regions. The majority of nucleon resonances chosen in this analysis coincide with those selected in our previous analysis and also in the Bayesian analysis with the Regge-plus-resonance model as the states contributing to this process with the highest probability.
Trvalý link: http://hdl.handle.net/11104/0283271