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Effective range expansion for narrow near-threshold resonances

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arxiv 2110.07484 v2 pith:KMVI7QRM submitted 2021-10-14 hep-ph hep-exhep-latnucl-th

classification hep-phhep-exhep-latnucl-th
keywords stateseffectiveexpansionnaturenear-thresholdrangeanalysechannels
verification ladder T0 review T1 audit T2 compute T3 formal
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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. As illustrative examples, we analyse the properties of the $\chi_{c1}(3872)$ and $T_{cc}^+$ states supporting the claim that these exotic states have a predominantly molecular nature.

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Cited by 4 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Effective Range Expansion with the Left-Hand Cut: Higher Order Improvements

    hep-ph 2026-01 conditional novelty 6.0 of 10

    Extended the generalized effective-range expansion, including the left-hand cut from one-particle exchange, to O(k^6) with a new relativistic version, validated against exact Yukawa-potential solutions of the Lippmann...

  2. Probing the structure of the $D_{s 0}^*(2317)$ and $X(3872)$ states through correlation functions

    hep-ph 2025-06 conditional novelty 6.0 of 10

    Femtoscopic correlation functions for D0K+ and D0Dbar*0 pairs are predicted to be sensitive to the molecular versus bare-state composition of D_s0*(2317) and X(3872).

  3. A short review on the compositeness of the $X(3872)$

    hep-ph 2025-02 conditional novelty 5.0 of 10

    Radiative decays and the LHCb line-shape data are incompatible with a purely molecular X(3872) and favor a compact or partially composite state, with a proposed molecular-amplitude fit for a decisive test.

  4. Effect of a repulsive three-body interaction on the $DD^{(*)}K$ molecule

    nucl-th 2025-02 conditional novelty 5.0 of 10

    Repulsive three-body interactions gradually expand DD(∗)K molecules and eventually dissociate them into a D(∗)K bound pair plus a distant D meson.

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