Parity violation in pion electroproduction and photoproduction with a proton target

Journal Article · Fri Oct 15 04:00:00 EDT 1982 · Ann. Phys. (N.Y.); (United States)

DOI:https://doi.org/10.1016/0003-4916(82)90032-X· OSTI ID:6368404

Li, S; Henley, E M; Hwang, W P

Parity violation in pion electroproduction and photoproduction in a proton target 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 10/sup -5/, whereas that in photoproduction is approx.10/sup -7/. The sensitivity to the parameter sin/sup 2/ theta/sub W/ is investigated; it is a maximum at backward electron scattering angles. In addition to the Born terms, contributions from the ..delta..(1232) resonance and the light vector mesons (rho(776) and ..omega..(782)) are included in the model. Fits to the observed ..pi../sup 0/ and ..pi../sup +/ electroproduction and photoproduction cross sections indicate that the model accounts for production data in the medium energy region.

• Research Organization: Institute for Nuclear Theory, Department of Physics, FM-15, University of Washington, Seattle, Washington 98195
• OSTI ID: 6368404
• Journal Information: Ann. Phys. (N.Y.); (United States), Journal Name: Ann. Phys. (N.Y.); (United States) Vol. 143:2; ISSN APNYA
• Country of Publication: United States
• Language: English

Related Subjects

645202* -- High Energy Physics-- Particle Interactions & Properties-Theoretical-- Electromagnetic Interactions & Properties
645203 -- High Energy Physics-- Particle Interactions & Properties-Theoretical-- Weak Interactions & Properties
645302 -- High Energy Physics-- Particle Invariance Principles & Symmetries-- Applications to Electromagnetic & Weak Interactions-- (-1987)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ALGEBRAIC CURRENTS
AMPLITUDES
ASYMMETRY
BARYON RESONANCES
BARYONS
BASIC INTERACTIONS
BEAMS
BOSONS
CROSS SECTIONS
CURRENTS
DELTA-1236 RESONANCES
ELECTROMAGNETIC INTERACTIONS
ELECTRON-NUCLEON INTERACTIONS
ELECTRON-PROTON INTERACTIONS
ELECTROPRODUCTION
ELEMENTARY PARTICLES
FERMIONS
HADRONS
INTERACTIONS
INVARIANCE PRINCIPLES
LEPTON-BARYON INTERACTIONS
LEPTON-HADRON INTERACTIONS
LEPTON-NUCLEON INTERACTIONS
MATHEMATICAL MODELS
MESON RESONANCES
MESONS
N RESONANCES
NEUTRAL CURRENTS
OMEGA-784 RESONANCES
P INVARIANCE
PARTICLE INTERACTIONS
PARTICLE MODELS
PARTICLE PRODUCTION
PHOTON-BARYON INTERACTIONS
PHOTON-HADRON INTERACTIONS
PHOTON-NUCLEON INTERACTIONS
PHOTON-PROTON INTERACTIONS
PHOTOPRODUCTION
PIONS
POLARIZED BEAMS
PSEUDOSCALAR MESONS
RESONANCE PARTICLES
RHO-765 RESONANCES
SCATTERING AMPLITUDES
UNIFIED GAUGE MODELS
VECTOR MESONS
WEAK NEUTRAL CURRENTS
WEINBERG-SALAM GAUGE MODEL