scholarly journals The Proton Spin Structure Function g2 at Low Q2 and Applications of Polarized 3He

2017 ◽  
Author(s):  
Jie Liu
Keyword(s):  
Structure Function ◽  
Spin Structure ◽  
Proton Spin ◽  
Spin Structure Function ◽  
Proton Spin Structure

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

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 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.

Analysis of the neutron spin structure function g1n by using the Laplace transform technique

2018 ◽  
Vol 27 (08) ◽  
pp. 1850071
Author(s):  
F. Teimoury Azadbakht ◽  
G. R. Boroun ◽  
B. Rezaei
Keyword(s):  
Laplace Transform ◽  
Structure Function ◽  
Spin Structure ◽  
Neutron Spin ◽  
Spin Structure Function ◽  
Transform Method ◽  
Laplace Transform Technique ◽  
The Laplace Transform ◽  
Convolution Approach ◽  
Neutron Spin Structure

In this paper, the polarized neutron structure function [Formula: see text] in the [Formula: see text] nucleus is investigated and an analytical solution based on the Laplace transform method for [Formula: see text] is presented. It is shown that the neutron spin structure function can be extracted directly from the polarized nuclear structure function of [Formula: see text]. The nuclear corrections due to the Fermi motion of the nucleons as well as the binding energy considerations are taken into account within the framework of the convolution approach and the polarized structure function of [Formula: see text] nucleus is expressed in terms of the spin structure functions of nucleons and the light-cone momentum distribution of the constituent nucleons. Then, the numerical results for [Formula: see text] are compared with experimental data of the SMC and HERMES collaborations. We found that there is an overall good agreement between the theory and experiments.

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