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Title: Measurement of the isovector axial form factor at Q{sup 2} = 0.23 (GeV/c){sup 2}

We present the preliminary value of the measurement of the parity violating asymmetry in the cross section of quasi-elastic scattering of longitudinally polarized electrons on deuteron at backward angles at Q{sup 2} = 0.23. The preliminary asymmetry is A{sub PV}{sup d}(Q{sup 2} = 0.23) = (−20.77±0.84{sub stat}±1.23{sub syst})10{sup −6}. From this value a preliminary linear combination of the G{sub M}{sup s} and the isovector axial form factor G{sub A} can be extracted G{sub A}{sup T = 1}+0.59G{sub M}{sup s} = −0.53±0.37±0.02. Combining this preliminary linear combination with that extracted from the measurement of the parity violating asymmetry on proton, already publish, it is possible to disentagle the form factors and thus we can obtain a preliminary experimental determination of the isovector axial form factor G{sub A}{sup T = 1} = −0.43±0.46.
Authors:
; ; ; ;  [1]
  1. Institut für Kernphysik, Johannes Gutenberg-Universität Mainz, J.J. Becherweg 45, D-55099 (Germany)
Publication Date:
OSTI Identifier:
22280681
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1563; Journal Issue: 1; Conference: Workshop to explore physics opportunities with intense, polarized electron beams at 50-300 MeV, Cambridge, MA (United States), 14-16 Mar 2013; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; ASYMMETRY; CROSS SECTIONS; DEUTERIUM TARGET; DEUTERONS; ELECTRON REACTIONS; ELECTRON-NUCLEON INTERACTIONS; ELECTRONS; FORM FACTORS; FOUR MOMENTUM TRANSFER; GEV RANGE; ISOVECTORS; PARITY; PARTICLE STRUCTURE; PROTONS; QUASI-ELASTIC SCATTERING