Acta Physica Polonica B
We propose an extended schematic model for hadrons in which quarks as well as diquarks serve as building blocks. The outcome is a reclassification of the hadron spectrum in which there are no radially excited hadrons: all mesons and baryons previously believed to be radial excitations are orbitally excited states involving diquarks. Also, there are no exotic hadrons: all hadrons previously believed to be exotic are states involving diquarks and are an integral part of the model. We discuss the implications of this result for a new understanding of confinement and its relation to asymptotic freedom, as well as its implications for a novel relation between the size and energy of hadrons, whereby an excited hadron shrinks.
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Friedmann, Tamar, "A New QCD Effect: the Shrinking Radius of Hadrons" (2012). Mathematics and Statistics: Faculty Publications, Smith College, Northampton, MA.