Springer LINK: The European Physical Journal A - Abstract Volume 1 Issue 4 (1998) pp 427-433

The European Physical Journal A

ISSN: 1434-6001 (printed version)
ISSN: 1434-601X (electronic version)

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Abstract Volume 1 Issue 4 (1998) pp 427-433

hadron physics: Proton polarization in the p(e,e'p)<pi>⁰ reaction and the measurement of quadrupole components in the N to <Delta> transition

H. Schmieden

Institut für Kernphysik der Johannes Gutenberg-Universität, 55099 Mainz, Germany

Received: 3 November 1997

Abstract: The recoil proton polarization in the <pi>⁰ production off the proton with longitudinally polarized electron beam has been studied as a means to measure quadrupole components in the N to <Delta> transition. On top of the <Delta> 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

Communicated by B. Povh

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The European Physical Journal A

hadron physics: Proton polarization in the p(e,e'p)<pi>0 reaction and the measurement of quadrupole components in the N to <Delta> transition

hadron physics: Proton polarization in the p(e,e'p)<pi>⁰ reaction and the measurement of quadrupole components in the N to <Delta> transition