Nuclear Effects On Hadron Production In Semi-inclusive Deep Inelastic Scattering

A quantitative understanding of the quark propagation and hadron formationprocesses in a nuclear medium would greatly benefit the study of quark-gluon plasmaand its evolution in time. The fragmentation of quarks into hadrons is still notcompletely understood. In fact, the final stages of hadronization involve low scalenon-perturbative processes in QCD together with hadronic wave functions which arenot yet calculable. Semi-inclusive deep inelastic scattering of leptons on the nucleusprovides a unique opportunity to study these effects on quark propagation andhadronization. Therefore, in the past three decades, semi-inclusive deep inelasticscattering on nuclear targets has been one of the most active frontiers in nuclearphysics and particle physics..This thesis studies nuclear effects on hadron production in semi-inclusive deepinelastic scattering. Both the effects of parton distribution functions and fragmentationfunction by means of rescaling model on Q2and the absorption of the final producedhadron are considered. Hadron multiplicities on nucleus xenon and neon relative tothose on the deuteron,RhM, are calculated for the three, K hadrons producedin semi-inclusive deep-inelastic scattering, and then compares with the experimentaldata. It is shown that the nuclear effects on parton distribution functions andfragmentation function have very small effect on multiplicity ratios decrease, whilethe effect of the absorption of the final produced hadron plays a leading role, and theacademic data calculated in absorption model are in good agreement with theexperimental data.