Once More on the P-Odd Asymmetry in the Elastic Scattering of Polarized Electrons on Nucleous

摘要

The parity violating asymmetry A/sub N/ in the elastic scattering of longitudinally polarized electrons on nucleons is discussed in the Weinberg-Salam theory. The asymmetry iriginates from the interference of the weak and one-photon exchange amplitudes. It is shown that the asymmetry is entirely expressed in terms of the parameter sin exp 2 THETA/sub W/, the electromagnetic form factors and the axial-vector form factor of the nucleon. Assuming the existence of scaling among the form factors, the A/sub N/ values for e exp - p scattering at electron beam energies E=300, 600 MeV and 3 GeV have been calculated at sin exp 2 THETA/sub W/=0.22, 0.23 and 0.24. Form factors compatible with the data obtained elsewhere have been used. The asymmetry A/sub N/ for the e exp - n scattering has proved to be several times the value for the e exp - p scattering. The calculations show that the uncertainties of the nucleon form factors slightly effect the value of the asymmetry in the electron energy range. (Atomindex citation 12:574761)