Measurement of the recoil polarization in the p(e, e'p)π0 reaction at the Δ(1232) resonance

Pospischil, T.H. et al. (2001) Measurement of the recoil polarization in the p(e, e'p)π0 reaction at the Δ(1232) resonance. Physical Review Letters, 86(14), 2959 -2962. (doi: 10.1103/PhysRevLett.86.2959)

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Publisher's URL: http://dx.doi.org/10.1103/PhysRevLett.86.2959

Abstract

The recoil proton polarization in the reaction P(e, e<sup>l</sup>p)φ<sup>0</sup> at the energy of the [Triangle Open] (1232) resonance was measured. Because of the spin precession in the magnetic spectrometer all three polarization components P<sub>x</sub>, P<sub>y</sub>, and P<sub>z</sub> were simultaneously accessible. From P<sub>x</sub> the Coulomb quadrupole to magnetic dipole ratio was determined in the framework of the Mainz Unitary Isobar Model as colossal magnetoresistance (CMR)(Q<sup>2</sup> = 0.121 GeV) = (-6.4 ± 0.7<sub>stat</sub> ± 0.8<sub>syst</sub>)%, which is in good agreement with the result obtained from the polarization ratio P<sub>x</sub>/P<sub>z</sub>.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Rosner, Professor Guenther
Authors: Pospischil, T.H., Bartsch, P., Baumann, D., Bermuth, J., Bohm, R., Bohinc, K., Derber, S., Ding, M., Distler, M., Drechsel, D., Elsner, D., Ewald, I., Friedrich, J., Friedrich, J.M., Geiges, R., Hedicke, S., Jennewein, P., Kahrau, M., Kamalov, S.S., Klein, F., Krygier, K.W., Lac, J., Liesenfeld, A., McIntyre, J., Merkel, H., Merle, P., Muller, U., Neuhausen, R., Potokar, M., Ransome, R.D., Rohe, D., Rosner, G., Schmieden, H., Seimetz, M., Sirca, S., Sick, I., Sule, A., Tiator, L., Wagner, A., Walcher, T., Warren, G.A., and Weis, M.
Subjects:Q Science > QC Physics
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Physical Review Letters
Publisher:American Physical Society
ISSN:0031-9007
ISSN (Online):1079-7114

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