• M. Krammer
  • H. Krasemann
Part of the NATO Advanced Study Institutes Series book series (NSSB, volume 49)


Since the discovery of the J/Ψ and Ψ′ in November 1974 1) we all witnessed a dramatic revival of the quark model 2). a new quark flavour, c = charm 3), vas added to the hadron spectrocopy, interpreting the J/Ψ and Ψ′ as cc bound states. This new system promised to be describable as nonrelativistic bound states of c and c: Charmonium 4). While the quark model for old mesons suffered from the fact that the quarks move relativistically (mass differences of old mesons are of the order of the masses themselves), in charmonium the relatively heavy (≈1.5 GeV) c-quarks should move relatively slowly, β2 = (v/c)2 ≈ 0.2. A perturbation expansion in β2 then converges rapidly and the well known powerful tools of exploring a nonrelativistic bound system could be used. This was the source of real excitement.


Soft Gluon Quark Flavour Thomas Precession Short Distance Behaviour Charmonium System 
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Copyright information

© Plenum Press, New York 1979

Authors and Affiliations

  • M. Krammer
    • 1
  • H. Krasemann
    • 2
  1. 1.Deutsches Elektronen-Synchrotron DESYHamburgGermany
  2. 2.II. Institut für Theoretische PhysikUniversität HamburgGermany

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