| Issue |
EPJ Web Conf.
Volume 274, 2022
XVth Quark Confinement and the Hadron Spectrum Conference (ConfXV)
|
|
|---|---|---|
| Article Number | 03017 | |
| Number of page(s) | 8 | |
| Section | 3 - Parallel Track B | |
| DOI | https://doi.org/10.1051/epjconf/202227403017 | |
| Published online | 22 December 2022 | |
https://doi.org/10.1051/epjconf/202227403017
Methods on compositeness and related aspects
Departamento de Física, Universidad de Murcia, 30071 Murcia, Spain
* e-mail: oller@um.es
Published online: 22 December 2022
In many physical applications, bound states and/or resonances are observed, which raises the question whether these states are elementary or composite. Here we elaborate on several methods for calculating the compositeness X of bound states and resonances in Quantum Mechanics, and in Quantum Field Theory by introducing particle number operators. For resonances X is typically complex and we discuss how to get meaningful results by using certain phase transformations in the S matrix.
© The Authors, published by EDP Sciences, 2022
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