Abstract.
A next-to-leading order QCD analysis of polarized and unpolarized structure functions of the proton in the (x, Q2)-plane is discussed within the scheme of the radiation parton formalism. The valence quark distribution is obtained from the application of the relativistic quark-exchange model to A = 3 mirror nuclei, i.e., 3He and 3H. The sea quark and gluon distributions are calculated using the inverse Mellin technique in the NLO approximation. A comparison is made with the corresponding available experimental data. We find a good fit for F2p(x, Q2) to the data. It is shown that our new NLO calculation improves our previous works. We argue that the valence quark scenario at some μ02 ≪ Q2 is a reasonable assumption in the framework of the DGLAP evolution equation. In agreement with the data, it is demonstrated that the asymmetry A1p(x, Q2) has no significant Q2-dependence as we go to the small x, even at NLO limit. Finally we argue that for small x ≤ 0.2 it is a good approximation to consider 3He and 3H structure functions as those of neutrons and protons, respectively.
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Modarres, M., Yazdanpanah, M. The NLO Parton Distribution in the (x, Q2)-Plane: A Relativistic Quark-Exchange Approach to A = 3 Mirror Nuclei. Few-Body Systems 37, 33–48 (2005). https://doi.org/10.1007/s00601-005-0112-4
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DOI: https://doi.org/10.1007/s00601-005-0112-4