APS » PROLA » Phys. Rev. Lett. » Volume 86 » Issue 14

Phys. Rev. Lett. 86, 2959 - 2962 (2001)

Measurement of the Recoil Polarization in the p(e→, e′p→)π0 Reaction at the Δ(1232) Resonance
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Th. Pospischil et al.
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Received 31 October 2000

The recoil proton polarization has been measured in the p(e→,e′p→)π0 reaction in parallel kinematics around W  =  1232  MeV, Q2  =  0.121  (GeV/c)2, and ε  =  0.718 using the polarized cw electron beam of the Mainz Microtron. All three proton polarization components, Px/Pe  =  (-11.4±1.3±1.4)%, Py  =  (-43.1±1.3±2.2)%, and Pz/Pe  =  (56.2±1.5±2.6)%, could be measured simultaneously. The Coulomb quadrupole to magnetic dipole ratio, CMR  =  (-6.4±0.7stat±0.8syst)%, was determined from Px in the framework of the Mainz Unitary Isobar Model. The consistency among the reduced polarizations and the extraction of the ratio of longitudinal-to-transverse response is discussed.


©2001 The American Physical Society

URL: http://link.aps.org/abstract/PRL/v86/p2959
DOI: 10.1103/PhysRevLett.86.2959
PACS: 13.60.Le, 13.40.-f, 14.20.Gk

* Present address: Physik Department E18, TU München, Germany.
† Permanent address: Laboratory for Theoretical Physics, JINR Dubna, Russia.
‡ Present address: Dept. of Physics and Astronomy, University of Glasgow, UK.
§ Corresponding author.Email address: hs@kph.uni-mainz.de
** Present address: Laboratory of Nuclear Science, MIT, Cambridge, MA.

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