Q²andx-Rescaling Meehanisms and the Nuclear Momentum Conservation in the EMC Effect

Abstract：

Based upon the consideration of the Fermi motion correction and the nuclear binding effect, the EMC effect can be explained by introducing the Q ²- and x-rescaling mechanisms. The experimental data, especially in the region 0.2 < x< 0.5, can be better reproduced by using the x-rescaling mechanism than using the Q ²-rescaling mechanism. The problem of the nuclear momentum conservation in the EMC effect is further discussed. In order to make up the 4% nuclear momentum loss, the different Q ²- or x-rescaling parameters for the momentum distributions of the valence and sea quarks in the nucleon structure function are chosen. The result shows that, by employing the extended x-rescaling mechanism, a better agreement between the theoretical result and the experimental data in the small xregion can be obtained.