Richard R. Silbar, T. Goldman
Using the LAMP model for nuclear quark structure, we calculate the binding energy and quark structure of a B meson with a D meson. The larger-than-nucleon masses of the two heavy quarks and the complete absence of quark Pauli Exclusion Principle repulsive effects produce a bound state with structure ranging from a deuteron-like state to a fully mixed four-quark state. Unlike the deuteron, however, pion exchange does not provide the dominant contribution to binding.
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http://arxiv.org/abs/1304.5480
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