Structure and compositeness of hadron resonances

Abstract

The structure of the hadron resonances attracts much attention, in association with the recent observations of various exotic hadrons which do not fit well in the conventional picture. These findings urge us to consider various new configurations such as the multiquark states and the hadronic molecules. However, it is a subtle problem to define a proper classification scheme for the hadron structure, and the nonzero decay width of the hadron resonances makes the analysis complicated. In this paper, we summarize the recent developments in the studies of the structure of the hadron resonances, focusing on the notion of the compositeness in terms of the hadronic degrees of freedom.

36 pages, 3 figures, published version

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• Weak decays of heavy hadrons into dynamically generated resonances
• Comprehensive analysis of the wave function of a hadronic resonance and its compositeness
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• On the nature of near-threshold bound and virtual states
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• Structure of near-threshold quasi-bound states
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• Constraint on K Kbar compositeness of the a0(980) and f0(980) resonances from their mixing intensity
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• Hadron mass scaling near the s-wave threshold
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• $P$-wave charmonium contribution to hidden-charm states from reanalysis of lattice QCD data
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• Compositeness of hadrons, nuclei, and atomic systems
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• Inverse scattering problem with a bare state
• What We Know About the Lambda(1405)
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• Reanalysis of lattice QCD spectra leading to the $D_{s0}^{\ast }(2317)$ and $D_{s1}^{\ast }(2460)$
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