✦ LIBER ✦

Spin structure of the nucleon — Experimental results

✍ Scribed by Ewa Rondio

Publisher: Elsevier Science
Year: 1998
Tongue: English
Weight: 556 KB
Volume: 629
Category: Article
ISSN: 0375-9474
DOI: 10.1016/s0375-9474(97)00692-1

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✦ Synopsis

The experimental status of the spin-dependent structure functions as obtained from deep inelastic scattering experiments at CERN, SLAC and DESY is discussed. The data available for g~, gdl and 9~ are evolved to common Q2=5 GeV 2 and compared.

The gl structure functions are now precise enough to perform sensible QCD analysis. The predicted Q2 dependence from this analysis is used to evaluate gi(x) at common Q2, at which the first moment of 9i is calculated. The extrapolation of gi to x=0, which is an controversial issue, is discussed in some details. The results obtained in all experiments show that the Ellis-Jaffe sum rule is violated, consistent with previous observations. For the Bjorken sum rule we obtain: r p -F" -: f~ gP(x, Q2)dx -fo i g'~(x, Q~)dx --0.192 =t= 0.021, which is in good agreement with the prediction of 0.181 =t= 0.003.

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