Abstract
A calculation is made of the parity-violating contributions of hypothetical excited quarks and leptons to two examples of low-energy phenomena. In particular, the contributions to polarized-electron--deuteron scattering and the parity-violating nuclear potential are studied. The parity-violating contributions are induced by the magnetic coupling of photons or gluons with virtual excited fermions and left-handed ordinary fermions. It is concluded that the mass of an excited quark, if it exists, must be larger than approx.3 TeV. The restriction on the mass of an excited lepton is less stringent.
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