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FIZIKA B 13 (2004) 1, 135-142
 
NUCLEON STRUCTURE FROM PION ELECTRO-PRODUCTION EXPERIMENTS AT MAMI
S. ŠIRCA for the A1 Collaboration at MAMI
Dept. of Physics, University of Ljubljana, Jadranska 19, 1000 Ljubljana,
Slovenia
and Jožef Stefan Institute, Jamova 39, 1000 Ljubljana, Slovenia
Received 18 July 2003; Accepted 26
April 2004
Online 10 October 2004
Recent pion electro-production experiments of the A1 Collaboration at MAMI are
presented. The threshold data in the p(e,e˘p)p0 and d(e,e˘d)p0 channels reveal the chiral dynamics of the pion-nucleon
system at low energies. Measurements of the neutral channel in the D
region address the issue of the pion cloud, while the p(e,e˘p+)n
channel gives access to the axial structure of the nucleon.
PACS numbers: 13.60.Le, 25.30.Rw, 13.10.+q
UDC 539.17
Keywords: threshold pion electro-production, nucleon-delta transition, pion cloud,
axial form-factor, chiral perturbation theory
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