scholarly journals Compass Measurement of g1 and QCD Fits

2016 ◽  
Vol 40 ◽  
pp. 1660017
Author(s):  
Fabienne Kunne
Keyword(s):  
Spin Structure ◽  
Proton Spin ◽  
Spin Structure Function ◽  
Large Uncertainty ◽  
Sum Rule ◽  
Bjorken Sum Rule ◽  
Statistical Precision ◽  
Spin Singlet ◽  
Low X ◽  
Proton Spin Structure

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.

scholarly journals Deep-Inelastice−pAsymmetry Measurements and Comparison with the Bjorken Sum Rule and Models of Proton Spin Structure

1978 ◽  
Vol 41 (2) ◽  
pp. 70-73 ◽  
Author(s):  
M. J. Alguard ◽  
W. W. Ash ◽  
G. Baum ◽  
M. R. Bergstrom ◽  
J. E. Clendenin ◽  
...  
Keyword(s):  
Spin Structure ◽  
Proton Spin ◽  
Sum Rule ◽  
Bjorken Sum Rule ◽  
Proton Spin Structure

scholarly journals Polarized Deep Inelastic Scattering

1997 ◽  
Vol 50 (1) ◽  
pp. 71
Author(s):  
F. M. Steffens ◽  
A. W. Thomas
Keyword(s):  
Inelastic Scattering ◽  
Structure Function ◽  
Spin Structure ◽  
Good Description ◽  
Proton Spin ◽  
Spin Structure Function ◽  
Sum Rule ◽  
Axial Anomaly ◽  
Proton Spin Structure ◽  
Polarized Deep Inelastic Scattering

We give an overview of present calculations involving the proton spin structure function. It is shown that a significant part of the discepancy between the data and the Ellis–Jaffe sum-rule may arise through the axial anomaly if the gluons within the proton are strongly polarized. While a quark model, such as the MIT bag, does not include the anomaly, and therefore cannot be expected to reproduce the spin structure function, it does give a rather good description of recent data which is anomaly free, such as the distribution of polarized, valence up-quarks in the proton.

scholarly journals Measurement of the proton spin structure function g1p with a pure hydrogen target

1998 ◽  
Vol 442 (1-4) ◽  
pp. 484-492 ◽  
Author(s):  
A. Airapetian ◽  
N. Akopov ◽  
I. Akushevich ◽  
M. Amarian ◽  
E.C. Aschenauer ◽  
...  
Keyword(s):  
Structure Function ◽  
Spin Structure ◽  
Proton Spin ◽  
Pure Hydrogen ◽  
Spin Structure Function ◽  
Hydrogen Target ◽  
Proton Spin Structure

Proton Spin Structure from Large Momentum Effective Theory

2017 ◽  
pp. 221-226
Author(s):  
Jian-Hui Zhang ◽  
Xiangdong Ji ◽  
Yong Zhao
Keyword(s):  
Spin Structure ◽  
Proton Spin ◽  
Effective Theory ◽  
Large Momentum ◽  
Proton Spin Structure
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