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26 April 2024

» arxiv » 2110.07484

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Effective range expansion for narrow near-threshold resonances
Vadim Baru ; Xiang-Kun Dong ; Meng-Lin Du ; Arseniy Filin ; Feng-Kun Guo ; Christoph Hanhart ; Alexey Nefediev ; Juan Nieves ; Qian Wang ;
Date:	14 Oct 2021
Abstract:	We discuss some general features of the effective range expansion, the content of its parameters with respect to the nature of the pertinent near-threshold states and the necessary modifications in the presence of coupled channels, isospin violations and unstable constituents. The properties of the $chi_{c1}(3872)$, also known as the $X(3872)$, as well as the $T_{cc}^+$ states are analysed as illustrative examples.
Source:	arXiv, 2110.07484
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