Effective range expansion for narrow near-threshold resonances

Effective range expansion for narrow near-threshold resonances

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. As illustrative exampl...

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Veröffentlicht in:Physics letters. B 2022-10, Vol.833, p.137290, Article 137290
Hauptverfasser: Baru, Vadim, Dong, Xiang-Kun, Du, Meng-Lin, Filin, Arseniy, Guo, Feng-Kun, Hanhart, Christoph, Nefediev, Alexey, Nieves, Juan, Wang, Qian
Format: Artikel
Sprache:eng
Schlagworte:
Effective range expansion
Exotic states
Hadronic molecules
Tetraquarks
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Zusammenfassung: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. As illustrative examples, we analyse the properties of the χc1(3872) and Tcc+ states supporting the claim that these exotic states have a predominantly molecular nature.
ISSN:0370-2693
DOI:10.1016/j.physletb.2022.137290