Nuclear Effect In High Energy P-A Collision Nucleus Drell-Yan Process With QCD Corrections

In the process of hadron nucleus collision,it is very important to understand correctly the nuclear effect of partons propagating in cold nuclear matter.The nuclear Drell-Yan process in high energy proton nucleus collisions and the semi-inclusive deep inelastic scattering process in lepton nucleus collisions provide an ideal tool to study the energy loss effect of partons in cold nuclear matter.Firstly,the energy loss effect of the outgoing quarks is studied by means of the semi-inclusive deep inelastic lepton-nucleus scattering process.In the research process,through Pearson2c statistical analysis,and the algorithm of Minuit function minimization to determine the parameter value,the experimental data are fitted and analyzed,and the energy loss value of the outgoing quark is obtained.Secondly,the energy loss effect of the incident quark and the energy loss effect of the incident gluon embedded in Compton scatterer process are studied by using the E906 experimental data of Drell-Yan process.Based on the SW quenching weights,the next-to-leading order Drell-Yan ratios are calculated with the nuclear parton distribution corrections which are obtained by only fitting the existing experimental data on nuclear structure functions.It is found that the obtained calculations with considering the incoming quark energy loss agree well with the E906,and predict that the impact of the incoming quark energy loss on the suppression of Drell-Yan ratio becomes more weak with the increase of the incident particle energy,which is in line with the the LPM regime prediction.The form of the Drell-Yan ratios as a function of the quark momentum fraction inhibits the influence of the QCD next-to-leading order correction,which may lead to the incoming gluon energy loss embodied in the primary next-to-leading order subprocess is not obvious.The results obtained will help to further clarify the physical mechanism of the initial energy loss effect of the parton in the middle of the cold nuclear matter,thus laying a foundation for the study of the parton energy loss effect in the hot nuclear medium.Figure 32;Table 4;Reference 73...