A possible global group structure for exotic states

Based on the fact that the long expected pentaquark which possesses the exotic quantum numbers of $$B=1$$ and $$S=1$$ was not experimentally found, although exotic states of $$XYZ$$ have been observed recently, we conjecture that the heavy flavors may play an important role in stabilizing the hadronic structures beyond the traditional qq̄ and $$qqq$$ composites.