| Issue |
EPJ Web Conf.
Volume 303, 2024
The 16th International Conference on Meson-Nucleon Physics and the Structure of the Nucleon (MENU 2023)
|
|
|---|---|---|
| Article Number | 01012 | |
| Number of page(s) | 6 | |
| Section | Hadron Spectroscopy | |
| DOI | https://doi.org/10.1051/epjconf/202430301012 | |
| Published online | 25 September 2024 | |
https://doi.org/10.1051/epjconf/202430301012
Exploring Light Meson Resonances in Two-Pion Photoproduction: A Regge Formalism Analysis
1 AGH University of Science and Technology, Faculty of Physics and Applied Computer Science, al. Mickiewicza 30, PL-30059 Kraków, Poland
2 Institute of Nuclear Physics, Polish Academy of Sciences, 31-342 Kraków, Poland
3 Departament de Física Quàntica i Astrofísica and Institut de Ciències del Cosmos, Universitat de Barcelona, E-08028, Spain
4 Departamento de Física Teórica, Universidad Complutense de Madrid and IPARCOS, E-28040 Madrid, Spain
5 Theory Center, Thomas Jefferson National Accelerator Facility, Newport News, VA 23606, USA
6 Center for Exploration of Energy and Matter, Indiana University, Bloomington, IN 47403, USA
7 Department of Physics, Indiana University, Bloomington, IN 47405, USA
* e-mail: nadine.hammoud.28@gmail.com
Published online: 25 September 2024
In the domain of hadron spectroscopy, the investigation of meson resonances plays a pivotal role. This study focuses on the significance of twopion photoproduction as a prominent avenue for studying meson resonances in the ππ system. By employing the Regge formalism, our model incorporates the background contribution from the well-known “Deck Mechanism” and emphasizes the significant ρ(770) resonance, representing the P-wave contribution arising from pomeron and f2 exchanges. The model is extended by accounting for scalar mesons, namely σ, f0(980) and f0(1370), contributing to the S-wave behavior, as well as the tensor meson f2(1270) corresponding to the D-wave contributions, while also considering non-resonant P- and S-wave components. The model contains a number of free parameters, which are constrained from a global fit of the available experimental data for angular moments up to L = 2 for M = 0, …, 2. The fitted angular moments are compared with experimental data obtained from CLAS. The key physical insights gained from the model are summarized. Furthermore, we extract the t-dependence of the Regge amplitude residue function for the subdominant exchanges, shedding light on their contribution to the overall dynamics.
© The Authors, published by EDP Sciences, 2024
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