标题： 带质量夸克的QCD螺旋振幅 显示英文标题

标题： Helicity amplitudes for QCD with massive quarks

摘要： 阿卡尼-哈梅德、黄和黄的新型大自旋螺旋度形式提供了一种优雅的方法，用于计算量子色动力学中任意夸克自旋投影的散射振幅。 在本说明中，我们计算了两类树级QCD振幅，包含一个大质量夸克对和n-2个胶子。 这两种情况包括所有胶子具有相同螺旋度，以及一个相反螺旋度的胶子与其中一个夸克颜色相邻。 我们的结果自然包含了之前已知的沿胶子动量之一量化自旋的夸克振幅。 在此处提出的所有多重性公式中，自旋量化轴可以随意调整，这包括确定螺旋度的夸克态的情况。 显示英文摘要

摘要： The novel massive spinor-helicity formalism of Arkani-Hamed, Huang and Huang provides an elegant way to calculate scattering amplitudes in quantum chromodynamics for arbitrary quark spin projections. In this note we compute two families of tree-level QCD amplitudes with one massive quark pair and n-2 gluons. The two cases include all gluons with identical helicity and one opposite-helicity gluon being color-adjacent to one of the quarks. Our results naturally incorporate the previously known amplitudes for both quark spins quantized along one of the gluonic momenta. In the all-multiplicity formulae presented here the spin quantization axes can be tuned at will, which includes the case of the definite-helicity quark states.