Parton Distribution of Proton in a Simple Statistical Model
  Taking proton as an ensemble of quark-gluon Fock states and using the principle of detailed balance, we construct a simple statistical model for parton distribution of proton. The recent observed Bjorken-$x$ dependent light flavor sea quark asymmetry $\bar{d}(x)-\bar{u}(x)$ can be well reproduced by Monte Carlo simulation as a pure statistical effect. 
Yong-Jun Zhang, Bing-Song Zou and Li-Ming Yang, (Peking University and   Institute of High Energy Physics, CAS, Beijing, China)