【摘要】 在现有的介子云模型的基础上 ,进一步考虑σ介子云效应对计算质子中的轻味海夸克分布所带来的影响 .我们发现计算结果能够更好的符合关于 d(x) / u(x)的实验数据 ,同时对模型中的ω介子云的参数给出一个修正 ,表明在物理核子中发现Fock态 |Nω〉的几率是一合理的小值 .更多还原

【Abstract】 The lightest meson π in meson cloud model gave a natural explanation for the observed large light flavor sea asymmetry in proton,but not a satisfied explanation for (x)/(x). Here we take into account the σ meson cloud effect,which gives a better description of the data. Meanwhile,our calculation implies a reasonable smaller probability of finding a physical proton in the Fock state |Nω〉 with a smaller value of Λ ω.更多还原