January 30, 2014 - Special Theory Meeting

Meeting Logistics

Thursday, January 30th 9am EST

JLAB Meeting Room TBD

Remote call-in information TBD

BACKGROUND FOR THEORISTS

OUR EXPERIMENTAL PROGRAM

To precisely measure scattering asymmetry of spin polarized electrons from thin pure Z foils

Accessible energy range is about 3 to 8 MeV

Targets on hand are gold, silver, copper foils of varying thickness, but can install others readily

Measure polarimeter systematics with goal <0.5%

SIMULATION PROGRAM

Build GEANT4 model of polarimeter and benchmark detector response against measurement

Implement physics (cross-section, Sherman function, spin transfer functions) provided by theory

Develop ab initio simulation dependence of asymmetry on target thickness (multiple scattering, radiation effects, etc) to measurement

By calibrating model to experimental data predict zero-thickness asymmetry with high precision <1%

THEORY PROGRAM

Provide physics tables for simulation (cross-section, Sherman function, spin transfer functions)

Describe theoretical basis, corrections, uncertainties

Advise which measurements may be best tests on leading corrections or limit absolute knowledge of physics

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