Measuring the Shape Proton Measuring the Shape Proton

BUT! We now have the Recoil ProtonPolarization Measurements!6 components:3 for “induced” Polarization3 for “transferred” PoalrizationHelicity-Dependent Polarized R’s(“transferred” – need pol. Beam)• The small differences between the twophenomenological models shown(“SAID” and “MAID”) dominated byresonant “1+” amplitudes.AJ Sarty (SMU): Shape of Proton (Fall 2002)AJ Sarty (SMU): Shape of Proton (Fall 2002)Helicity-Independent Polarized R’s(“induced” – don’t need pol. Beam)PRELIMINARY Attempt to ExtractMultipoles from ALL of E91-011 Data(cross section and polarization angulardistributions!)• EPIPROD program by J.J. Kelly, U. Maryland• The now larger differences between thetwo phenomenological models shown(“SAID” and “MAID”) arises from lackof knowledge of the non-resonantmultipole amplitudes (“background”).AJ Sarty (SMU): Shape of Proton (Fall 2002)AJ Sarty (SMU): Shape of Proton (Fall 2002)