Parton distribution functions and nuclear EMC effect in a statistical model

A new and simple statistical approach is performed to calculate the parton distribution functions (PDFs) of the nucleon in terms of light-front kinematic variables. Analytic expressions of x-dependent PDFs are obtained in the whole x region. And thereafter, we treat the temperature T as a parameter of the atomic number A to explain the nuclear EMC effect in the region x [0.2, 0.7]. We give the predictions of PDF ratios,and they are very different from those by other models, thus experiments aiming at measuring PDF ratios are suggested to provide a discrimination of different models. (authors)