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CALT-68-1964 From Tetraquark to Hexaquark: A Systematic Study of Heavy Exotics in the Large Nc Limit

By Chi-keung Chow


A systematic study of multiquark exotics with one or Nc − 1 heavy quarks in the large Nc limit is presented. By binding a chiral soliton to a heavy meson, either a normal Nc-quark baryon or an exotic (Nc + 2)-quark baryon is obtained. By replacing the heavy quark with Nc−1 heavy antiquarks, exotic (2Nc − 2)-quark and 2Nc-quark mesons are obtained. When Nc = 3, they are just the normal triquark baryon Qqq, the exotic pentaquark baryon Q¯q¯q¯q¯q, tetraquark di-meson ¯ Q ¯ Qqq and the hexaquark di-baryon ¯ Q ¯ Q¯q¯q¯q¯q respectively. Their stabilities and decays are also discussed. In particular, it is shown that the “heavy to heavy ” semileptonic decays are described by the Isgur–Wise form factors of the normal baryons. 1 One of the early triumphs of the quark model is its success in describing the hadron spectrum. By regarding hadrons as q¯q or qqq configurations, their quantum numbers (charge

Year: 2008
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