Large Magnetic Moment Effects at High Energies and Composite Particle Models

  • A. O. Barut
Part of the Studies in the Natural Sciences book series (SNS, volume 19)


Spin effects are generally thought to be inessential complications in particle physics. The discovery of large spin-dependent terms in recent pp and np experiments with polarized particles, which have been discussed extensively in the previous Proceedings of this conference,1 shows that this is not the case. I shall show that spin effects not only play a major role in scattering at high energies, but also dominate the bound-state problems at short distances. Consequently any model or theory of hadrons, or any subconstituent model using spin-1/2-components (with magnetic moments) must take into account the following purely electromagnetic effect: The (electro)magnetic interactions become very strong at short distances and give rise to the formation of massive, narrow resonances between light spin-1/2— particles which subsequently decay very weakly by tunnelling. In the following we explain this phenomenon and extend it to the case of the neutrino, assumed to have a small anomalous magnetic moment.


Anomalous Magnetic Moment Internal Symmetry Spin Effect Heavy Lepton Quantum Formula 
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  1. 1.
    A. Yokosawa, in Orbis Scientiae, Studies in Natural Sciences, Vol. 12, (1977), Plenum Press, K. Abe, in Orbis Scientiae, Studies in Natural Sciences, Vol. 12 (1977), Plenum Press, A.D. Krisch, in Orbis Scientiae, Studies in Natural Sciences, Vol. 16 (1979), Plenum Press.Google Scholar
  2. 2.
    For some recent reviews see A.O. Barut, Surveys in High Energy Physics, 1, 113–140 (1981); in American Institute of Physics Conference Proceedings, Vol. 71 (edit. T. Seligman), p. 73–107 (1981); in Quantum-electrodynamics of Strong Fields (edit. W. Greiner), Plenum Press, 1982.Google Scholar
  3. 3.
    A.O. Barut and Bowei Xu, Derivation of Pauli Spin-orbit and Spin-Spin Potentials from Field Theory, preprint 1980 (to be published).Google Scholar
  4. 4.
    A.O. Barut and G.L. Strobel, Composite Models of Pion and Muon and a Calculation of the Fermi Coupling Constant from their Decay (to be published).Google Scholar
  5. 5.
    A.O. Barut and S.A. Basri, Connection between the Stable Particle Model and the Integrally Charged Quark Model (to be published).Google Scholar
  6. 6.
    See the contribution of C. Rebbi and D. Gross, G. Preparata, these proceedings.Google Scholar
  7. 7.
    A.O. Barut, Z.Z. Aydin and I.H. Duru, An Upper Limit on the Magnetic Moment of the Neutrino (to be published).Google Scholar
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    D.G. Crabb, Phys. Rev. Lett. 43, 983 (1979).CrossRefGoogle Scholar
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    A.O. Barut, Physica (in press).Google Scholar

Copyright information

© Plenum Press, New York 1983

Authors and Affiliations

  • A. O. Barut
    • 1
  1. 1.The University of ColoradoBoulderUSA

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