The energy loss effect in nuclear matter is another nuclear effect apart from the nuclear effects on the parton distribution as in deep inelastic scattering process. The quark energy loss can be measured best by the nuclear dependence of the high energy nuclear Drell-Yan process. By means of three kinds of quark energy loss parameterizations given in literature and the nuclear parton distribution extracted only with lepton-nucleus deep inelastic scattering experimental data, measured Drell-Yan production cross sections are analyzed for 800GeV proton incident on a variety of nuclear targets from FNAL E866. It is shown that our results with considering the energy loss effect are much different from these of the FNAL E866 who analysis the experimental data with the nuclear parton distribution functions obtained by using the deep inelastic lA collisions and pA nuclear Drell-Yan data . Considering the existence of energy loss effect in Drell-Yan lepton pairs production,we suggest that the extraction of nuclear parton distribution functions should not include Drell-Yan experimental data.
In this paper we present an improved nuclear density model. We have found the nuclear effect parameters’ formula RAV(x,Q2) and RAS(x,Q2) for the valence quark distribution and sea quark distribution in the nucleus, in which we have used the relation between the nuclear density and the mean binding energy in nucleus. By using the model, we can well explain the experimental data of the of Drell-Yan process in P-A.
The double Q 2 -rescaling model is used to compute the change of K-factor with XA2 when the nucleus carbon-nucleus carbon collision occurs at different values of x A \, where x are momentum fraction variables. In the calculation, the contributions of annihilations and Compton scattering have been considered for the Drell-Yan process. The calculated results show that the plots of K-factor versus x A2 are very different for different values ofx Ai . They are also compared with experimental data, which provides a test to the model of nuclear effect and the QCD theory itself.
In this paper we present an improved double Q2 rescaling model.Based on this condition of the nuclear momentum conservation,we have found a Q2 rescaling parameters' formula of the model,where we have established the connection between the Q2 rescaling parameter ξi(i=v,s,g) and the mean binding energy in nucleus.By using this model,we coned explain the experimental data of the EMC effect in the whole x region,the nuclear Drell-Yan process and J/Ψ photoproduction process.
At high energies, Drell–Yan process can be viewed in the target rest frame as bremsstrahlung of massive photons, rather than parton annihilation. In this paper, the ratio of the p-A Drell–Yan cross section per nucleon for an 800 GeV proton beam incident on Fe, W, and Be targets are calculated by means of the color dipole approach in the target rest system. It is shown that our calculations can quite well fit the Fermilab E866 experimental data with considering the nuclear shadowing effect in p-A Drell–Yan process and without the energy loss effect in it.
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