January 30, 2014 - Special Theory Meeting

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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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