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Electroproduction of πomesons in the region of the first pion-nucleon resonance

Authors
Journal
Nuclear Physics B
0550-3213
Publisher
Elsevier
Publication Date
Volume
32
Issue
1
Identifiers
DOI: 10.1016/0550-3213(71)90064-2
Disciplines
  • Philosophy
  • Physics

Abstract

Abstract The reaction e −+p→e −+p+ π o has been studied in the π−N centre of mass range from 1130 to 1340 MeV/ c 2 by detecting the final proton in coincidence with the scattered electron. The four-momentum transfer to the pion-nucleon system was between 0.40 and 0.50 (GeV/ c) 2 and the polarisation of the exchanged virtual photon near unity. The proton angular distribution is analysed phenomenologically in terms of the multipoles M 1+, E 1+, S 1+ contributing to the resonant partial wave and E o+, S o+ contributing to the s-wave background. The magnetic dipole excitation M 1+ is shown to dominate the cross section but clear evidence is obtained for a significant contribution from the scalar multipole S 1+.

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