Quark Energy Loss and Shadowing in Nuclear Drell-Yan Process

摘要

＜正＞ The energy loss effect in nuclear matter is another nuclear effect apart from the nuclear effects on the partondistribution as in deep inelastic scattering process. The quark energy loss can be measured best by the nuclear dependenceof the high energy nuclear Drell Yan process.By means of three kinds of quark energy loss parameterizations given inliterature and the nuclear parton disribution extacted only with lepton-nucleus deep inelastic scattering experimentaldata,measured Drell Yan production cross sections are analyzed for 800 GeV proton incident on a variety of nucleartargets from FNAL E866.It is shown that our results with considering the energy loss effect are much different fromthose of the FNAL E866,who analyzes the experimental data with the nuclear parton diatribution functions obtainedby using the deep inelastic lA collisions and pA nuclear Drell Yan data.Considering the existence of energy loss effectin Drell Yan lepton pairs production,we suggest that the extraction of nuclear parton distribution functions should notinclude Drell Yan experimental data.