标题： 矢量介子在密集物质中 显示英文标题

标题： Vector mesons in dense matter

摘要： 我们将总结利用从Bore尔变换的色散关系和QCD算符乘积展开得到的约束方程来理解核介质中矢量介子谱密度变化的进展。 我们将讨论轻夸克系统（$\rho, \omega$）、奇异夸克系统（$\phi$）和重夸克系统（$J/\psi$）在核介质中的标量质量位移和色散效应（三动量依赖性）的结果。 对于轻夸克系统，预期质量和宽度会有显著变化，而色散效应被发现很小。 详细比较了现有模型计算的色散效应与约束方程。 对于重夸克系统，得到了非常小但精确的质量位移。 显示英文摘要

摘要： We will summarize the progress in understanding the changes in the vector meson spectral density in nuclear medium using the constraint equations obtained from the Borel transformed dispersion relation and QCD Operator Product Expansion. We will discuss the results for the scalar mass shift and dispersion effects (three momentum dependence) for the light quark system ($\rho, \omega$), the strange quark system ($\phi$) and the heavy quark system ($J/\psi$) in nuclear medium. For the light quark systems, a nontrivial change in the mass and width are expected, while the dispersion effects are found to be small. Existing model calculations for the dispersion effects are compared to the constraint equation in detail. Very small, but accurate mass shift is obtained for the heavy quark system.