Precision Measurement of the Spin Structure of the Proton and the Deuteron
- SLAC
Experiment E155 at the Stanford Linear Accelerator Center measured the spin structure functions g{sub 1} and g{sub 2} of the proton and deuteron using deep inelastic scattering of 50 GeV polarized electrons from dynamically polarized, solid {sup 15}NH{sub 3} and LiD targets. Three independent spectrometers, covering a large kinematic region, 0.014 < x{sub Bjorken} < 0.9 and 1 < Q{sup 2} < 40 (GeV/c){sup 2}, detected 200 million events. A fully self-consistent and statistically sound approach to calculating radiative corrections was developed, providing well-defined statistical errors for the E155 data set. Also, a comprehensive fit to the global data set was created which simultaneously describes all existing data on p, d and n ({sup 3}He) targets. The results represent a significant increase in the accuracy of the world data set and, together with the existing data, give improved results for the Bjorken sum rule and the quark spins. The gluon contribution to the nucleon spin is confirmed to be significant.
- Research Organization:
- Stanford Linear Accelerator Center, Menlo Park, CA (US)
- Sponsoring Organization:
- USDOE Office of Energy Research (ER) (US)
- DOE Contract Number:
- AC03-76SF00515
- OSTI ID:
- 763861
- Report Number(s):
- SLAC-R-557
- Country of Publication:
- United States
- Language:
- English
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