Modelling nucleon-nucleon scattering above 1 GeV
Department of Physics, University of Idaho, ID 83844, Moscow, USA
2 Institut für Experimentalphysik, Universität Hamburg, D-22761, Hamburg, Germany
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Motivated by the recent measurement of proton-proton spin-correlation parameters up to 2.5GeV laboratory energy, we investigate models for nucleon-nucleon (NN) scattering above 1GeV. Signatures for a gradual failure of the traditional meson model with increasing energy can be clearly identified. Since spin effects are large up to tens of GeV, perturbative QCD cannot be invoked to fix the problems. We discuss various theoretical scenarios and come to the conclusion that we do not have a clear phenomenological understanding of the spin dependence of the NN interaction above 1GeV.
© Società Italiana di Fisica and Springer-Verlag, 2004