Chiral model for q-barq and qq-barqq mesons

@article{Napsuciale2004ChiralMF,
  title={Chiral model for q-barq and qq-barqq mesons},
  author={Mauro Napsuciale and Simon Rodriguez},
  journal={Physical Review D},
  year={2004},
  volume={70}
}
We point out that the spectrum of pseudoscalar and scalar mesons exhibits a quasidegenerate chiral nonet in the energy region around 1.4 GeV whose scalar component has a slightly inverted spectrum. Based on the empirical linear rising of the mass of a hadron with the number of constituent quarks which yields a mass around 1.4 GeV for tetraquarks, we conjecture that this quasichiral nonet arises from the mixing of a chiral nonet composed of tetraquarks with conventional q-barq states. We explore… 
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