Institut für Theoretische Physik, Universität Regensburg, D-93040 Regensburg, Germany and Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai 400005, India.
Institut für Theoretische Physik, Universität Regensburg, D-93040 Regensburg, Germany.
Phys Rev Lett. 2014 Aug 29;113(9):092001. doi: 10.1103/PhysRevLett.113.092001. Epub 2014 Aug 25.
We determine the nonperturbative gluon condensate of four-dimensional SU(3) gauge theory in a model-independent way. This is achieved by carefully subtracting high-order perturbation theory results from nonperturbative lattice QCD determinations of the average plaquette. No indications of dimension-two condensates are found. The value of the gluon condensate turns out to be of a similar size as the intrinsic ambiguity inherent to its definition. We also determine the binding energy of a B meson in the heavy quark mass limit.
我们以模型独立的方式确定了四维 SU(3) 规范理论的非微扰胶子凝聚物。这是通过仔细从非微扰格点 QCD 对平均 plaquette 的确定中减去高阶微扰理论结果来实现的。没有发现二阶凝聚物的迹象。胶子凝聚物的值与它的定义所固有的内在不确定性具有相似的大小。我们还在重夸克质量极限下确定了 B 介子的束缚能。
