Measuring the Shape Proton Measuring the Shape Proton

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Hall A Facility for Performing Measurement• Beam Polarization mid-high 70%’s• Average current (whole run) = 45 µA(143 C): HIGHEST: 108.2 µA, P=79%Hall AFocal Plane Polarimeter:(FPP)Tools in Hall A:• 2 Hi-Res Specs(6 msr each)• FPP• High I, high Pol.cw beam• 15 cm LH2cryotarget• E 0 up to 5 GeVAJ Sarty (SMU): Shape of Proton (Fall 2002)Hall A E91-011 MeasuredCross Section Angular Distributions(PRELIMINARY!)UPDATED World’s Data forEMR & CMR (as of now!)• Each “box” above is a bin in φ, , showingopening angle (θ)() distribution.• With JUST this cross section data, we cando the same “simplified” EMR & CMRextraction as earlier experiments …AJ Sarty (SMU): Shape of Proton (Fall 2002)• A LOT of NEW data from Hall B’s“CLAS” at JLab (Jooet al., PRL, 2002) –from extensive cross section distributions• Our Prelim points from Cross SectionsOnly (blue(points) ) in agreement …AJ Sarty (SMU): Shape of Proton (Fall 2002)
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)
Page 1 and 2: Measuring the Shapeof theProtonmore
Page 3 and 4: Outline for (the rest of)the Talk
Page 5 and 6: ELECTRON SCATTERING:How do we Reall
Page 7 and 8: Response Definitions:• Each Respo
Page 9: OOPS: Model Dependence inthe R LT R

Measuring the Shape Proton Measuring the Shape Proton

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