Large Magnetic Moment Effects at High Energies and Composite Particle Models
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.
KeywordsAnomalous Magnetic Moment Internal Symmetry Spin Effect Heavy Lepton Quantum Formula
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