Parton distribution functions in nuclei

Abstract

Optimum nuclear parton distributions are determined by an analysis of muon and electron deep inelastic scattering data. Assuming simple A dependence and polynomial functions of x and 1-x for nuclear modification of parton distributions, we determine the initial distributions by a chi^2 analysis. Although valence-quark distributions are relatively well determined except for the small-x region, antiquark distributions cannot be fixed at medium and large x. It is also difficult to fix gluon distributions.Comment: 1+4 pages, LaTeX2e, ws-p8-50x6-00.cls, 4 eps figures. Talk given at the 9th International Workshop on Deep Inelastic Scattering, Bologna, Italy, April 27 - May 1, 2001. To be published in proceedings. Computer codes for the nuclear parton distributions could be obtained from http://hs.phys.saga-u.ac.jp Email: [email protected], [email protected], [email protected]