Abstract
The quantum properties of a helixlike shaped QCD string are studied in the context of the semiclassical Lund fragmentation model. It is shown how simple quantization rules combined with the causality considerations in the string fragmentation process describe the mass hierarchy of light pseudoscalar mesons. The quantized helix string model predicts observable quantum effects related to the threshold behavior of the intrinsic transverse momentum of hadrons, and of the minimal transverse momentum difference between adjacent hadrons. The numerical fit of the properties of the QCD field breaking into ground state hadrons agree with astonishing precision with values obtained recently in the theory of knotted chromoelectric flux tubes.
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