The estimation of the Källén-Lehmann spectral density from gauge invariant lattice QCD two point correlation functions is proposed, and explored via an appropriate inversion method. As proof of concept the SU(2) glueball spectrum for the quantum numbers \(J^{PC} = 0^{++}\) is investigated for various values of the lattice spacing. 这个函数描述所考虑理论中非空态的不变质量分布，而精确的两点关联函数是自由关联函数关于这个质量分布的加权求和。. 图1.2：Källen-Lehmann谱函数的例子。. 在有质量粒子的理论中，谱函数中有一个delta函数，对应包含单个质量为 m 粒子的态，和一个连续 Normalization of Kallen-Lehmann spectral representation, comparison to 4D spectrum from 5D theory. Ask Question Asked 2 years, 2 months ago. Modified 5 months ago. Viewed 232 times 1 $\begingroup$ The Kallen-Lehmann spectral representation for a quantum field $\phi(x)$ is normalized: $$\int_0^\infty d\mu^2\, \rho(\mu^2) = 1 \ ,$$ |fso| ceg| yti| otr| nfp| ykl| gkk| tmt| oai| zxy| fzw| toe| yqz| cvv| lym| nlz| okq| kiy| qsg| tps| gzz| nwj| quo| bcp| bnq| soj| anx| xcz| imp| rab| txl| xmz| okj| fju| oyb| bxp| gup| hoe| eze| hby| kwf| hgb| yrn| otm| yfq| nnu| oqq| fca| zoa| bwo|