Abstract
We present the latest COMPASS results on the proton spin structure function g[Formula: see text](x) at 200[Formula: see text]GeV. The data improve the statistical precision by a factor of [Formula: see text]2 at low x. A reevaluation of the Bjorken sum rule based on COMPASS proton and deuteron data confirms its validation to a 9% accuracy. Finally, results from a global NLO QCD fit of g1 world data are shown. The extracted spin singlet distribution leads to an integrated value of [Formula: see text] at Q[Formula: see text] (GeV/c)2. The large uncertainty is mainly driven by the unknown shape of the distribution.
Highlights
We present here COMPASS latest results on the proton longitudinal spin structure function gp1(x)
Test of the Bjorken Sum Rule The Bjorken sum rule is a fundamental QCD prediction relating the first moment of the proton and the neutron spin structure functions to the ratio of the axial-vector
This is an Open Access article published by World Scientific Publishing Company
Summary
We present here COMPASS latest results on the proton longitudinal spin structure function gp1(x). Preliminary results [2] are shown in Fig. 1 together with previous results taken at 160 GeV [3] and earlier results from SMC. 2. Test of the Bjorken Sum Rule The Bjorken sum rule is a fundamental QCD prediction relating the first moment of the proton and the neutron spin structure functions to the ratio of the axial-vector
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