Measurement of GEp/GMp via polarization transfer at Q2 = 0.4 GeV /c2

• DOI: 10.1007/s100500170046
• Publication Date: 2003-05-15T12:57:07Z
• Authors: Th. Pospischil; P. Bartsch; D. Baumann; R. Böhm; K. Bohinc; M. Ding; S. Derber; M.O. Distler; D. Elsner; I. Ewald; J. Friedrich; J.M. Friedrich; S. Grözinger; S. Hedicke; P. Jennewein; J. Jourdan; M. Kahrau; F. Klein; K.W. Krygier; J. Lac; A. Liesenfeld; S. Malov; J. McIntyre; H. Merkel; P. Merle; U. Müller; R. Neuhausen; M. Potokar; R.D. Ransome; D. Rohe; G. Rosner; J. Sanner; H. Schmieden; M. Seimetz; S. Širca; I. Sick; O. Strähle; A. Süle; A. Wagner; Th. Walcher; M. Weis
• Keywords: Microtron

The polarization transfer from longitudinally polarized electrons to protons in the elastic scattering p( e, e' p) has been measured around Q2 = 0.4 (GeV/c)2 with the three-spectrometer facility at the Mainz microtron MAMI. From this polarization transfer the ratio G Ep/(G Mp/μp) has been determined. The ratio is found to be slightly less than unity in agreement with recent results from other laboratories and from the Rosenbluth separation of cross-sections measured with unpolarized electrons.