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- W2057722969 abstract "We analyze fall-apart decays of polyquark (tetra, penta and molecule type) hadrons within the constituent quark picture. For processes in which a polyquark hadron goes to final states containing a light pseudoscalar meson the constraints given by chiral symmetry are implemented. As an application of the approach developed, fall-apart decays of $a(980)$ and $X(3872)$ are studied, assuming these mesons are polyquark hadrons. Two extreme options---confined diquark-diquark states and molecular states---are considered. For ${a}^{0}(980)$, the observed width can be obtained assuming that this meson is a diquark-diquark composite with a relatively large size of around $1textdiv{}1.5text{ }text{ }mathrm{fm}$. The pure $Koverline{K}$ molecular-type state, however, can be excluded. For the $X(3872)$, a sufficiently small width can be obtained if it is a dominantly isospin-0 diquark-diquark composite with a very large size of $ensuremath{ge}2.5text{ }text{ }mathrm{fm}$. The pure molecular option appears possible if the binding energy is tiny, ${E}_{b}ensuremath{lesssim}0.2text{ }text{ }mathrm{MeV}$, corresponding to a huge size." @default.
- W2057722969 created "2016-06-24" @default.
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- W2057722969 date "2006-08-28" @default.
- W2057722969 modified "2023-09-24" @default.
- W2057722969 title "Fall-apart decays of polyquark hadrons" @default.
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- W2057722969 doi "https://doi.org/10.1103/physrevd.74.034022" @default.
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