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Title: Parity-Violating Electron Deuteron Scattering and the Proton's Neutral Axial Vector Form Factor

Abstract

The authors report on a new measurement of the parity-violating asymmetry in quasielastic electron scattering from the deuteron at the backward angles at electron beam energy of 125 MeV [Q{sup 2}=0.038 (GeV/c){sup 2}]. This quantity provides a determination of the neutral weak axial vector form factor of the nucleon. In addition to the tree level amplitude associated with Z-exchange, the neutral weak axial vector form factor as measured in electron scattering can potentially receive large electroweak corrections, including the anapole moment, that are absent in neutrino scattering. The measured asymmetry A = -3.51 {+-} 0.57 (stat) {+-} 0.58 (sys) ppm is consistent with theoretical predictions. We also report on updated results of the previous experiment at 200 MeV [Q{sup 2} = 0.091 (GeV/c){sup 2}] on a deuterium target. The updated results are also consistent with theoretical predictions on the neutral weal axial vector form factor.

Authors:
;
Publication Date:
Research Org.:
Thomas Jefferson National Accelerator Facility, Newport News, VA (US)
Sponsoring Org.:
USDOE Office of Energy Research (ER) (US)
OSTI Identifier:
816826
Report Number(s):
JLAB-THY-03-171; DOE/ER/40150-2573
TRN: US0305149
DOE Contract Number:  
AC05-84ER40150
Resource Type:
Journal Article
Resource Relation:
Other Information: No journal information given for this preprint; PBD: 1 Nov 2003
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; AMPLITUDES; ASYMMETRY; DEUTERIUM TARGET; DEUTERONS; ELECTRON BEAMS; ELECTRONS; FORM FACTORS; NEUTRINOS; SCATTERING; VECTORS

Citation Formats

Ito, T, and et al. Parity-Violating Electron Deuteron Scattering and the Proton's Neutral Axial Vector Form Factor. United States: N. p., 2003. Web.
Ito, T, & et al. Parity-Violating Electron Deuteron Scattering and the Proton's Neutral Axial Vector Form Factor. United States.
Ito, T, and et al. Sat . "Parity-Violating Electron Deuteron Scattering and the Proton's Neutral Axial Vector Form Factor". United States. https://www.osti.gov/servlets/purl/816826.
@article{osti_816826,
title = {Parity-Violating Electron Deuteron Scattering and the Proton's Neutral Axial Vector Form Factor},
author = {Ito, T and et al},
abstractNote = {The authors report on a new measurement of the parity-violating asymmetry in quasielastic electron scattering from the deuteron at the backward angles at electron beam energy of 125 MeV [Q{sup 2}=0.038 (GeV/c){sup 2}]. This quantity provides a determination of the neutral weak axial vector form factor of the nucleon. In addition to the tree level amplitude associated with Z-exchange, the neutral weak axial vector form factor as measured in electron scattering can potentially receive large electroweak corrections, including the anapole moment, that are absent in neutrino scattering. The measured asymmetry A = -3.51 {+-} 0.57 (stat) {+-} 0.58 (sys) ppm is consistent with theoretical predictions. We also report on updated results of the previous experiment at 200 MeV [Q{sup 2} = 0.091 (GeV/c){sup 2}] on a deuterium target. The updated results are also consistent with theoretical predictions on the neutral weal axial vector form factor.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Sat Nov 01 00:00:00 EST 2003},
month = {Sat Nov 01 00:00:00 EST 2003}
}