Measurements of Spin Structure Function G1(P) and G1(D) for Proton and Deuteron at SLAC E143

Technical Report · Tue Jan 06 04:00:00 EST 2004

DOI:https://doi.org/10.2172/826670· OSTI ID:826670

Liu, T J ^[1]

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1. SLAC

E143 was a high precision measurement of the proton and deuteron spin structure functions g{sub 1} and g{sub 2} in SLAC's End Station A facility, with longitudinally and transversely polarized NH3 and ND3 targets, and a longitudinally polarized electron beam. The experiment was done,at beam energies of 29, 16 and 9.7 Gev. The deeply inelastic scattered electrons were detected by two independent spectrometers at 4.5{sup o} and 7{sup o} relative to the incident electron beam. At a beam energy of 29 Gev, the measurements covered the Bjorken x range from 0.03 to 0.8, and the Q{sup 2} range from 1.2 (GeV/c){sup 2} to 9.8 (GeV/c){sup 2} . It was found that the {integral}{sub 0}{sup 1} g{sub 1}{sup p}(x, Q{sub 2})dx is more than two standard deviations away from the Ellis-Jaffe sum rule, and the corresponding deuteron integral is more than three standard deviations away from the Ellis-Jaffe's rule, but the Bjorken sum rule is consistent with the experimental data. Tests of the sum rules at different values of Q{sup 2}, and the implications of these results for the quark-parton model have also been done.

• Research Organization: Stanford Linear Accelerator Center, Menlo Park, CA (US)
• Sponsoring Organization: USDOE Office of Science (US)
• DOE Contract Number: AC03-76SF00515
• OSTI ID: 826670
• Report Number(s): SLAC-R-696
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
ACCURACY
DEUTERONS
ELECTRON BEAMS
ELECTRONS
PROTONS
SPECTROMETERS
SPIN
STANFORD LINEAR ACCELERATOR CENTER
STRUCTURE FUNCTIONS
SUM RULES
TARGETS