Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1996-02-08
Austral.J.Phys. 50 (1997) 45-51
Physics
High Energy Physics
High Energy Physics - Phenomenology
10 pages, LATEX, 5 eps figures. Talk given at the Joint Japan-Australia Workshop on "Quarks, Hadrons, and Nuclei", Adelaide,
Scientific paper
Various shadowing aspects of nuclear parton distributions are discussed in a parton-model framework. We explain existing $x$ dependent data of $F_2^A/F_2^D$, then the model is applied to a flavor asymmetry $\bar u-\bar d$ in a nucleus, to shadowing in valence-quark distributions, and to nuclear dependence of $Q^2$ evolution. First, we find that a finite nuclear $\bar u-\bar d$ distribution could be possible due to nuclear interactions even in the flavor symmetric case in the nucleon ($\bar u -\bar d$=0). Second, it is indicated that valence-quark shadowing could be used for discriminating among various shadowing models. Third, we find that nuclear dependence of $Q^2$ evolution $\partial [F_2^{Sn}/F_2^C]/ \partial [\ln Q^2]$, which was found by NMC, is essentially understood by modification of parton distributions in nuclei. However, higher-twist effects in nuclear interactions could be tested by studying the details of the nuclear $Q^2$ evolution.
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