Electroproduction of πo mesons in the region of the first pion-nucleon resonance

R. D. Hellings, J. Allison, A. B. Clegg, F. Foster, G. Hughes, P. Kummer, R. Siddle, B. Dickinson, M. Ibbotson, R. Lawson, H. E. Montgomery, W. J. Shuttleworth, A. Sofair, J. Fannon

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14 Scopus citations


The reaction e-+p→e-+p+πo has been studied in the π-N centre of mass range from 1130 to 1340 MeV/c2 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 M1+, E1+, S1+ contributing to the resonant partial wave and Eo+, So+ contributing to the s-wave background. The magnetic dipole excitation M1+ is shown to dominate the cross section but clear evidence is obtained for a significant contribution from the scalar multipole S1+.

Original languageEnglish (US)
Pages (from-to)179-188
Number of pages10
JournalNuclear Physics, Section B
Issue number1
StatePublished - 1971
Externally publishedYes

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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