Proton polarization in the p(e,ep0 reaction and the measurement of quadrupole components in the N to Δ transition

  • H. Schmieden
Hadron physics


The recoil proton polarization in the π0 production off the proton with longitudinally polarized electron beam has been studied as a means to measure quadrupole components in the N to Δ transition. On top of the Δ resonance a high sensitivity to a possible Coulomb quadrupole excitation is found in parallel kinematics. The ratio of S1+/M1+ multipole amplitudes can be determined from the ratio of the two in-scattering-plane recoil proton polarization components. Avoiding the absolute measurement of the polarizations, such a ratio allows small experimental uncertainties. Furthermore, the electron helicity independent proton polarization component enables the characterization of resonant and non-resonant pieces.

PACS:14.20.Gk Baryon resonances with S=0 – 13.60.Rj Baryon productions – 13.60.Le Meson production – 13.40.-f Electromagnetic processes and properties – 13.60.-r Photon and charged-lepton interactions with hadrons 


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Copyright information

© Springer-Verlag Berlin Heidelberg 1998

Authors and Affiliations

  • H. Schmieden
    • 1
  1. 1.Institut für Kernphysik der Johannes Gutenberg-Universität, 55099 Mainz, GermanyDE

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