The Spin Asymmetries of the Nucleon Experiment (SANE) measured the proton spin structure function g2 in a range of Bjorken x, 0.3 < x < 0.8, where extraction of the twist-3 matrix element d2 p (an integral of g2 weighted by x2) is most sensitive. The data was taken from Q2 equal to 2.5 GeV 2 up to 6.5 GeV2. In this polarized electron scattering off a polarized hydrogen target experiment, two double spin asymmetries, A∥ and A⊥ were measured using the BETA (Big Electron Telescope Array) Detector. BETA consisted of a scintillator hodoscope, gas Čerenkov counter, lucite hodoscope and a large lead glass electromagnetic calorimeter. With a unique open geometry, a threshold gas Čerenkov detector allowed BETA to cleanly identify electrons for this inclusive experiment. A measurement of d2 p is compared to lattice QCD calculations.
|Commitee:||Jones, Mark, Metz, Andreas, Sparveris, Nikolaos, Surrow, Bernd|
|School Location:||United States -- Pennsylvania|
|Source:||DAI-B 76/09(E), Dissertation Abstracts International|
|Keywords:||Color force, Higher twists, Nuceon spin structure, Proton structure functions, Qcd|
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