Status of exotic-quantum-number mesons

  title={Status of exotic-quantum-number mesons},
  author={Curtis A. Meyer and Yves van Haarlem},
  journal={Physical Review C},
The search for mesons with non-quark-antiquark (exotic) quantum numbers has gone on for nearly 30 years. Currently there is experimental evidence of three isospin one states, the ${\ensuremath{\pi}}_{1}(1400)$, the ${\ensuremath{\pi}}_{1}(1600)$, and the ${\ensuremath{\pi}}_{1}(2015)$. For all of these states, there are questions about their identification and even if some of them exist. In this article, we will review both the theoretical work and the experimental evidence associated with… 
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