标题： QCD求和规则用于ρ、ω、φ介子-核子散射长度以及核介质中的质量移动 显示英文标题

标题： QCD sum rules for ρ, ω, φmeson-nucleon scattering lengths and the mass shifts in nuclear medium

摘要： 一个新的QCD求和规则分析展示了自旋-同位旋平均的$\rho$、$\omega$和$\phi$介子-核子散射长度。通过引入矢量电流核子前向散射振幅低能极限的约束关系，我们得到$a_\rho=-0.47\pm 0.05$fm、$a_\omega=-0.41\pm 0.05$fm和$a_\phi=-0.15\pm 0.02$fm，这表明这些V-N相互作用是吸引性的。还证明了之前关于这些矢量介子在核介质中质量移动的研究本质上是从线性密度近似中的这些散射长度获得的。 显示英文摘要

摘要： A new QCD sum rule analysis on the spin-isospin averaged $\rho$, $\omega$ and $\phi$ meson-nucleon scattering lengths is presented. By introducing the constraint relation on the the low energy limit of the vector-current nucleon forward scattering amplitude, we get $a_\rho=-0.47\pm 0.05$ fm, $a_\omega=-0.41\pm 0.05$ fm and $a_\phi=-0.15\pm 0.02$ fm, which suggests that these V-N interactions are attractive. It is also proved that the previous studies on the mass shift of these vector mesons in the nuclear medium are essentially the ones obtained from these scattering lengths in the linear density approximation.