Measurements of the Q{sup 2}-Dependence of the Proton and Neutron Spin Structure Functions g{sub 1}{sup p} and g{sub 1}{sup n}
Journal Article
·
· Physics Letters B
OSTI ID:837864
The structure functions g{sub 1}{sup p} and g{sub 1}{sup n} have been measured over the range 0.014 < x < 0.9 and 1 < Q{sup 2} < 40 GeV{sup 2} using deep-inelastic scattering of 48 GeV longitudinally polarized electrons from polarized protons and deuterons. We find that the Q{sup 2} dependence of g{sub 1}{sup p} (g{sub 1}{sup n}) at fixed x is very similar to that of the spin-averaged structure function F{sub 1}{sup p} (F{sub 1}{sup n}). From a NLO QCD fit to all available data we find {Gamma}{sub 1}{sup p} - {Gamma}{sub 1}{sup n} = 0.176 {+-} 0.003 {+-} 0.007 at Q{sup 2} = 5 GeV{sup 2}, in agreement with the Bjorken sum rule prediction of 0.182 {+-} 0.005.
- Research Organization:
- Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
- Sponsoring Organization:
- USDOE Office of Energy Research (ER) (US)
- DOE Contract Number:
- AC05-84ER40150
- OSTI ID:
- 837864
- Report Number(s):
- JLAB-PHY-00-81; DOE/ER/40150-3208; hep-ph/0007248; SLAC-PUB-7994; TRN: US0501125
- Journal Information:
- Physics Letters B, Vol. 493; Other Information: PBD: 9 Nov 2000
- Country of Publication:
- United States
- Language:
- English
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