On Deusons or Deuteronlike Meson-Meson Bound States

Abstract

The systematics of deuteronlike two-meson bound states, {\it deusons}, is discussed. Previous arguments that many of the present non-$q\bar{q}$ states are such states are elaborated including, in particular, the tensor potential. For pseudoscalar states the important observation is made that the centrifugal barrier from the P-wave can be overcome by the $1/r^2$ and $1/r^3$ terms of the tensor potential. In the heavy meson sector one-pion exchange alone is strong enough to form at least deuteron-like $B{\bar{B}}^{\ast }$ and $B^{\ast }{\bar{B}}^{\ast }$ composites bound by approximately 50 MeV, while $D{\bar{D}}^{\ast }$ and $D^{\ast }{\bar{D}}^{\ast }$ states are expected near the threshold.

Invited talk at the Hadron93 International Conf. on Hadron Spectroscopy, Como, Italy 22.-25.6. 1993. 5 pages in LATEX HU-SEFT R 1993-13b

References in corpus (1)

• Exotic QQ\qbar\qbar States in QCD

Cited by in corpus (73)

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• Production of $P_c$ states from ${\Lambda }_b$ decay
• Probing new types of $P_c$ states inspired by the interaction between an $S$-wave charmed baryon and an anticharmed meson in a $\bar{T}$ doublet state
• Prediction of triple-charm molecular pentaquarks
• Emergence of molecular-type characteristic spectrum of hidden-charm pentaquark with strangeness embodied in the $P_{\psi s}^{\Lambda }(4338)$ and $P_{cs}(4459)$
• A Phenomenological analysis on isospin-violating decay of $X(3872)$
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• Correlation of the hidden-charm molecular tetraquarks and the charmoniumlike structures existing in the $B\to XYZ+K$
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• A new group of doubly charmed molecule with $T$-doublet charmed meson pair
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• Possible Molecular States Composed of Doubly Charmed Baryons with Couple-channel Effect
• Possible hadronic molecular states composed of $S$-wave heavy-light mesons
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