Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1998-03-25
Physics
High Energy Physics
High Energy Physics - Phenomenology
27 pages, Tex, 7 PostSript figures. Revised version contains more detailed explanation of some steps. The Fig.6 is replaced by
Scientific paper
The alternative to the standard formulation of the quark-parton model is proposed. Our relativistically covariant approach is based on the solution of the master equations relating the structure and distribution functions, which consistently takes into account the intrinsic quark motion - in contradistinction to the standard infinite momentum approach, in which this motion is latently suppressed. The model well reproduces the experimental data on the both polarized and unpolarized structure functions, assuming that only the valence quarks term contributes to the nucleon spin. It is shown, the combined analysis of the polarized and unpolarized data can give an information about the effective masses and intrinsic motion of the quarks inside the nucleon. Simultaneously, it is shown that the rate of the nucleon energy carried by the quarks can be less, than estimated from the standard approach. As an addition, a prediction for the proton spin function $g_2$ is given.
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