PARITY VIOLATION IN PION ELECTROPRODUCTION AND PHOTOPRODUCTION WITH A PROTON TARGET
Journal
Annals Phys.
Journal Volume
143
Pages
372-412
Date Issued
1982
Author(s)
Abstract
Parity violation in pion electroproduction and photoproduction on a proton target is investigated as a possible means of elucidating the structure of the electronic and non-leptonic neutral weak currents. We calculate both parity-violating effects caused directly by Z-boson exchange, which contributes only to electron scattering, and those due to parity-violating electromagnetic and nuclear interactions. The asymmetry in electroproduction is of order 20-5, whereas that in photoproduction is ∼10-7. The sensitivity to the parameter sin2 θw is investigated; it is a maximum at backward electron scattering angles. In addition to the Born terms, contributions from the Δ(1232) resonance and the light vector mesons [ρ{variant}(776) and ω(782)] are included in the model. Fits to the observed π0 and π+ electroproduction and photoproduction cross sections indicate that the model accounts for the production data in the medium energy region. © 1982.
SDGs
Type
journal article