Extracting the pole and Breit-Wigner properties of nucleon and resonances from the photoproduction
Open Access
- 14 September 2021
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review D
- Vol. 104 (5), 056015
- https://doi.org/10.1103/physrevd.104.056015
Abstract
We have developed a covariant isobar model to phenomenologically explain the four possible isospin channels of photoproduction. To obtain a consistent reaction amplitude, which is free from the lower-spin background problem, we used the consistent electromagnetic and hadronic interactions described in our previous report. We used all available experimental data, including the recent MAMI A2 2018 data obtained for the and isospin channels. By fitting the calculated observables to these data we extract the resonance properties, including their Breit-Wigner and pole parameters. Comparison of the extracted parameters with those listed by the Particle Data Group yields a nice agreement. An extensive comparison of the calculated observables with experimental data is also presented. By using the model we investigated the effects of three different form factors used in the hadronic vertex of each diagram. A brief discussion on the form factors is given.
Funding Information
- Universitas Indonesia (NKB-1652/UN2.RST/HKP.05.00/2020)
- Indonesian Endowment Fund for Education
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