https://doi.org/10.1140/epjc/s10052-026-15775-0
Regular Article - Theoretical Physics
Analysis of the 
cross section within a unitarized coupled-channel approach
Departamento de Física Aplicada, Cinvestav-IPN, Carretera Antigua a Progreso Km. 6, Apdo. Postal 73 “Cordemex”, 97310, Mérida, Yucatán, Mexico
a
This email address is being protected from spambots. You need JavaScript enabled to view it.
Received:
2
March
2026
Accepted:
29
April
2026
Published online:
14
May
2026
Abstract
We investigate the 
cross section by employing a model that combines relativistic Breit–Wigner amplitudes with a unitarized coupled-channel approach to account for resonant and non-resonant contributions, respectively. By performing a global fit to the BESIII experimental data, we determine the essential free parameters of the transition amplitudes. Furthermore, we analyze the role of a dynamically generated 
pole near 3.88 GeV and demonstrate its critical contribution to shaping the observed cross-section line shape.
© The Author(s) 2026
Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.
Funded by SCOAP3.
