论文标题
在QCD中的夸克光谱函数上
On the quark spectral function in QCD
论文作者
论文摘要
我们计算了在等异，对称近似中2+1风味真空QCD中光夸克风味的光谱功能。我们采用光谱Dyson-Schwinger方程并直接实时计算非扰动夸克传播器，使用了最近的光谱重建，这是由于Gluon传播器数据的高斯过程回归2+1风味晶格QCD的回归。我们的结果具有大于传播器的间隙量表和负散射连续体的时间样峰值结构，我们在迭代溶液中假设分析杆尾裂开。通过对夸克 - 格鲁恩顶点和Gluon繁殖器对夸克传播器分析结构的影响的一般讨论进行了一般讨论，从而增强了计算。特别是，我们研究了夸克传播剂在哪些条件下显示非物理复合物极。我们的结果提供了广泛的应用，包括QCD中传输的AB-Initio计算以及共振属性。
We calculate the spectral function of light quark flavours in 2+1 flavour vacuum QCD in the isospin-symmetric approximation. We employ spectral Dyson-Schwinger equations and compute the non-perturbative quark propagator directly in real-time, using recent spectral reconstruction results from Gaussian process regression of gluon propagator data in 2+1 flavour lattice QCD. Our results feature a pole-like peak structure at time-like momenta larger than the propagator's gapping scale as well as a negative scattering continuum, which we exploit assuming an analytic pole-tail split during the iterative solution. The computation is augmented with a general discussion of the impact of the quark-gluon vertex and the gluon propagator on the analytic structure of the quark propagator. In particular, we investigate under which conditions the quark propagator shows unphysical complex poles. Our results offer a wide range of applications, encompassing the ab-initio calculation of transport as well as resonance properties in QCD.
