标题： 核子共振跃迁到矢量介子的耦合 显示英文标题

标题： Nucleon Resonance Transition Couplings to Vector Mesons

摘要： 近期的重离子实验表明，在介质中$\rho-$介子的质量发生了改变。在CERES实验中，$\rho-$介子在$\sim$倍正常核物质密度下产生，在这种情况下，强子比夸克更适合作为基本组分。一种集体的“核$\rho$”描述被引入，其中每个核子都被激发到N(1520)态，并且具有相同的振幅。在未来更高密度的实验中，构成夸克将成为适当的变量。在这里，通过手征夸克模型得到了到1700 MeV核共振（包括N(1520)）的$\rho$和$\omega$转移耦合。相关的耦合常数用核子的相应矢量耦合常数来表示。通过计算已知的从π介子衰变宽度得到的π-共振耦合常数，验证了该模型关系的质量。 显示英文摘要

摘要： Recent heavy ion experiments indicate modifications of the $\rho-$meson mass in medium. In the CERES experiments $\rho-$mesons are produced at $\sim$ normal nuclear matter density, where hadrons are more appropriate constituents than quarks. A collective "nuclear $\rho$", in which every nucleon is excited to the N(1520) state, with equal amplitude, enters in this description. At the higher densities reached by future experiments constituent quarks become the appropriate variables. Here the $\rho$ and $\omega$ transition couplings to the nucleon resonances up to 1700 MeV, including the N(1520), are derived by means of the chiral quark model. The relevant coupling constants are expressed in terms of the corresponding vector coupling constants to nucleons. The quality of the model relations is tested by a calculation of the corresponding pion-resonance coupling constants, which are known from the empirical pion decay widths.