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29 March 2024
 
  » arxiv » nucl-ex/0010020

 Article overview


Measurement of the recoil polarization in the p (vec e, e' vec p) pi^0 reaction at the Delta(1232) resonance
Th. Pospischil ; P. Bartsch ; D. Baumann ; J. Bermuth ; R. Boehm ; K. Bohinc ; S. Derber ; M. Ding ; M. Distler ; D. Drechsel ; D. Elsner ; I. Ewald ; J. Friedrich ; J.M. Friedrich ; R. Geiges ; S. Hedicke ; P. Jennewein ; M. Kahrau ; S.S. Kamalov ; F. Klein ; K.W. Krygier ; J. Lac ; A. Liesenfeld ; J. McIntyre ; H. Merkel ; P. Merle ; U. Mueller ; R. Neuhausen ; M. Potokar ; R.D. Ransome ; D. Rohe ; G. Rosner ; H. Schmieden ; M. Seimetz ; S. Sirca ; I. Sick ; A. Suele ; L. Tiator ; A. Wagner ; Th Walcher ; G.A. Warren ; M. Weis ;
Date 31 Oct 2000
Journal Phys.Rev.Lett. 86 (2001) 2959-2962
Subject nucl-ex
AbstractThe recoil proton polarization has been measured in the p (vec e,e’vec p) pi^0 reaction in parallel kinematics around W = 1232 MeV, Q^2 = 0.121 (GeV/c)^2 and epsilon = 0.718 using the polarized c.w. electron beam of the Mainz Microtron. Due to the spin precession in a magnetic spectrometer, all three proton polarization components P_x/P_e = (-11.4 pm 1.3 pm 1.4) %, P_y = (-43.1 pm 1.3 pm 2.2) %, and P_z/P_e = (56.2 pm 1.5 pm 2.6) % could be measured simultaneously. The Coulomb quadrupole to magnetic dipole ratio CMR = (-6.4pm 0.7_{stat}pm 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.
Source arXiv, nucl-ex/0010020
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