%0 Journal Article
%T Asymmetry of Strange Sea in Nucleons
%A Xue-Qian Li
%A Xiao-Bing Zhang
%A Bo-Qiang Ma
%J Physics
%D 2001
%I arXiv
%R 10.1103/PhysRevD.65.014003
%X Based on the finite-temperature field theory, we evaluate the medium effects in nucleon which can induce an asymmetry between quarks and antiquarks of the strange sea. The short-distance effects determined by the weak interaction can give rise to $\delta m\equiv \Delta m_s-\Delta m_{\bar s}$ where $\Delta m_{s(\bar s)}$ is the medium-induced mass of strange quark by a few KeV at most, but the long-distance effects by strong interaction are sizable. Our numerical results show that there exists an obvious mass difference between strange and anti-strange quarks, as large as 10-100 MeV.
%U http://arxiv.org/abs/hep-ph/0111183v1