Abstract
Recent discoveries by Belle and BESIII of charged exotic quarkonium-like resonances provide fresh impetus for study of heavy exotic hadrons. In the limit N c → ∞, M Q → ∞ the \( \overline{Q}Q\overline{q}{q^{\prime }} \) tetraquarks (TQ-s) are expected to be narrow and slightly below or above the \( \overline{Q}{q^{\prime }} \) and \( Q\overline{q} \) two-meson threshold. The isoscalar TQ-s manifest themselves by decay to \( \left( {\overline{Q}Q} \right) \) ππ, and the ~30 MeV heavier charged isotriplet TQ-s by decays into \( \left( {\overline{Q}Q} \right) \) π . The new data strongly suggest that the real world with N c = 3, Q = c, b and q,q ′ = u,d is qualitatively described by the above limit. We discuss the relevant theoretical estimates and suggest new signatures for TQ-s in light of the recent discoveries. We also consider “baryon-like” states \( Q{Q^{\prime }}\overline{q}{{\overline{q}}^{\prime }} \), which if found will be direct evidence not just for near-threshold binding of two heavy mesons, but for genuine tetraquarks with novel color networks. We stress the importance of experimental search for doubly-heavy baryons in this context.
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ArXiv ePrint: 1304.0345
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Karliner, M., Nussinov, S. The doubly heavies: \( \overline{Q}Q\overline{q}q \) and \( QQ\overline{q}\overline{q} \) tetraquarks and QQq baryons. J. High Energ. Phys. 2013, 153 (2013). https://doi.org/10.1007/JHEP07(2013)153
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DOI: https://doi.org/10.1007/JHEP07(2013)153