Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2001-11-15
Phys.Rev. D65 (2002) 014003
Physics
High Energy Physics
High Energy Physics - Phenomenology
15 latex pages, 3 figures, to appear in PRD
Scientific paper
10.1103/PhysRevD.65.014003
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.
Li Xue-Qian
Ma Bo-Qiang
Zhang Xiao-Bing
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