A possible global group structure for exotic states

Abstract

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 $q\bar{q}$ and $qqq$ composites.

arXiv comment9 pages. More discussions added and typos corrected. Accepted by Eur. Phys. J. C

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