Strange sea asymmetry in nucleons

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We evaluate the medium effects in nucleon which can induce an asymmetry of the strange sea. The short-distance effects determined by the weak interaction can give rise to δm≡ Δmₛ-Δm s where Δms(s) is the medium-induced mass of strange quark by a few KeV at most, but the long-distance effects by strong interaction could be sizable.