Summary
The systematics of deuteronlike two-meson bound states,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 theP-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 deuteronlike\(B\bar B^* \) and\(B^* \bar B^* \) composites bound by approximately 50 MeV, while\(D\bar D^* \) and\(D^* \bar D^* \) states are expected near the threshold.
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Törnqvist, N.A. On deusons or deuteronlike meson-meson bound states. Nuov Cim A 107, 2471–2476 (1994). https://doi.org/10.1007/BF02734018
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DOI: https://doi.org/10.1007/BF02734018