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“School of Physics”

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Paper   IPM / P / 6729
School of Physics
  Title:   The Q2 Dependence of Polarized and Unpolarized Proton Structure Functions in the Relativistic Quark Exchange Framework
  Author(s): 
1.  M.M. Yazdanpanah
2.  M. Modarres
  Status:   Published
  Journal: Eur. Phys. J. A
  No.:  75
  Vol.:  7
  Year:  2000
  Pages:   573-581
  Supported by:  IPM
  Abstract:
In this article we intend to discuss the evolution of polarized and unpolarized structure functions in the (x,Q2) plane. We analyze the proton data on the spin dependence asymmetry A1(x,Q2), by making the dynamical assumption that at low resolution energies, the hadrons consist only of valence quarks and the scaling violation of F2(x,Q2) at low x comes only from the gluons density. While the sea quark and the gluon distributions are calculated using the inverse Mellin technique and the various moments of the valence quarks, the valence quark distribution itself is obtained from the relativistic quark-exchange model. A comparison is made with the corresponding available experimental data. Finally in agreement with the data, it is demonstrated that there is no significant Q2-dependence of asymmetry A1(x,Q2) for x ranging 0.014 ≤ x ≤ 0.25.

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