Nuclear EMC Effect in a Statistical Model

A simple statistical model in terms of light-front kinematic variables is used to explain the nuclear EMC effect in the range x ∈ [0.2, 0.7], which was constructed by us previously to calculate the parton distribution functions (PDFs) of the nucleon. Here, we treat the temperature T as a parameter of the atomic number A, and get reasonable results in agreement with the experimental data. Our results show that the larger A, the lower T thus the bigger volume V , and these features are consistent with other models. Moreover, we give the predictions of the quark distribution ratios, i.e., qA(x)/qD(x), q̄A(x)/q̄D(x), and sA(x)/sD(x), and also the gluon ratio gA(x)/gD(x) for iron as an example. The predictions are different from those by other models, thus experiments aiming at measuring the parton ratios of antiquarks, strange quarks, and gluons can provide a discrimination of different models.