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Evidence that the a0(980) and f0(980) are not elementary particles
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abstract
We study the interesting problem of whether it is possible to distinguish composite from elementary particles. In particular we generalize a model-independent approach of S. Weinberg to the case of unstable particles. This allows us to apply our formalism to the case of the a0(980) and f0(980) resonances and to address the question whether these particles are predominantly genuine, confined quark states (of $\bar q q$ or $qq\bar q\bar q$ structure) or governed by mesonic components.
Forward citations
Cited by 8 Pith papers
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Two-pion exchange for coupled-channel scattering of two heavy mesons
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Finite-volume analysis of the $H$-dibaryon including left-hand-cut effects
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Isospin-breaking effects on the threshold cusp structures in $\Lambda N$-$\Sigma N$ scattering
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For finite-range potentials, the compositeness of a bound state is exactly proportional to the probability of finding the particle outside a chosen radius, with a universal factor depending on angular momentum.
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Compositeness relations for near-threshold p-wave bound states
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Composite nature of the $T_{cc}$ state
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Production of exotic hadrons in $pp$ and nuclear collisions
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