Abstract
Various shadowing aspects of nuclear parton distributions are discussed in a
parton-model framework. We explain existing x dependent data of
F2A
/F2D,
then the model is applied to a flavour asymmetry –
d in a nucleus, to shadowing in valence-quark
distributions, and to nuclear dependence of
Q2 evolution. First, we find that
a finite nuclear ū – đ distribution could be
possible due to nuclear interactions even in the flavour symmetric case in the
nucleon ( ū – đ = 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
Q2 evolution ∂
[F2Sn/F2C]/∂[ln
Q2], which was found by the
New Muon Collaboration (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
Q2 evolution.
Subject
General Physics and Astronomy