4.8 Article

Measurement of the recoil polarization in the p((e)over-right-arrow, e′(p)over-right-arrow)π0 reaction at the Δ(1232) resonance

Journal

PHYSICAL REVIEW LETTERS
Volume 86, Issue 14, Pages 2959-2962

Publisher

AMERICAN PHYSICAL SOC
DOI: 10.1103/PhysRevLett.86.2959

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The recoil proton polarization has been measured in the p((e) over right arrow, e(1)(p) over right arrow)pi (0) reaction in parallel kinematics around W = 1232 MeV, Q(2) = 0.121 (GeV/c)(2) and epsilon = 0.718 using the polarized cw electron beam of the Mainz Microtron. All three proton polarization components, P-x/P-e = (-11.4 +/- 1.3 +/- 1.4)%, P-y = (-43.1 +/- 1.3 +/- 2.2)%, and P-z/P-e = (56.2 +/- 1.5 +/- 2.6)%, could be measured simultaneously. The Coulomb quadrupole to magnetic dipole ratio, CMR = (-6.4 +/- 0.7(stat) +/- 0.8(syst))%, was determined from P-x 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.

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