Axial and pseudoscalar nucleon form factors from low energy pion electroproduction

The cross section for exclusive [pi][sup +] electroproduction on the proton has been measured near threshold for the first time at two different values of the virtual photon polarization ([var epsilon][similar to]0.2 and [var epsilon][similar to]0.7). Using the low energy theorem for this reaction w...

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Bibliographic Details
Published in:	Physical review letters Vol. 71; no. 24; pp. 3927 - 3930
Main Authors:	SEONHO CHOI, DUVAL, M. A, FOUNIER, G, FRANCARIA, R, GIFFON, M, GUICHON, P. A. M, MARCHAND, C, MARRONCLE, J, MARTINO, J, MILLER, J, NAHABETIAN, R, SAGHAI, B, ELOUADRHIRI, L, SAMOUR, C, VERNIN, P, WARDE, E, ESTENNE, V, BARDIN, G, BERTHOT, J, BERTIN, P. Y, DE BOTTON, N, DIDELEZ, J. P, FONVIEILLE, H
Format:	Journal Article
Language:	English
Published:	Ridge, NY American Physical Society 13-12-1993
Subjects:	662120 - General Theory of Particles & Fields- Symmetry, Conservation Laws, Currents & Their Properties- (1992-) 662330 - Photon & Charged-Lepton Interactions with Hadrons- 662410 - Properties of Baryons & Baryon Resonances- (1992-) BARYONS Baryons (including antiparticles) BASIC INTERACTIONS BOSONS CROSS SECTIONS Currents and their properties ELECTROMAGNETIC INTERACTIONS ELECTROPRODUCTION ELEMENTARY PARTICLES Exact sciences and technology FERMIONS FORM FACTORS General theory of fields and particles HADRONS INTERACTIONS LOW-ENERGY THEOREM MASSLESS PARTICLES Meson production MESONS Nuclear Experiment NUCLEONS Partially conserved axial-vector currents PARTICLE INTERACTIONS PARTICLE PRODUCTION PARTICLE PROPERTIES PCAC THEORY Photon and charged-lepton interactions with hadrons PHOTONS Physics PHYSICS OF ELEMENTARY PARTICLES AND FIELDS PIONS PIONS PLUS POLARIZATION Properties of specific particles Protons and neutrons PSEUDOSCALAR MESONS Specific reactions and phenomenology The physics of elementary particles and fields Low energy Particle production Pions plus Pseudovector coupling Axial-vector currents Nucleons Electroproduction Form factors Cross sections
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Summary:	The cross section for exclusive [pi][sup +] electroproduction on the proton has been measured near threshold for the first time at two different values of the virtual photon polarization ([var epsilon][similar to]0.2 and [var epsilon][similar to]0.7). Using the low energy theorem for this reaction we deduce the axial and pseudoscalar weak form factors [ital G][sub [ital A]] and [ital G][sub [ital P]] at [vert bar][ital t][vert bar]=0.073, 0.139, and 0.179 (GeV/[ital c])[sup 2]. The slope of [ital G][sub [ital A]] agrees with the value obtained in neutrino experiments. [ital G][sub [ital P]] satisfies the pion pole dominance hypothesis, which is thus verified for the first time in this range of transfer.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	0031-9007 1079-7114
DOI:	10.1103/PhysRevLett.71.3927