We present a compact expression for a coherent vertex operator in superstring theory, in the Neveu-Schwarz sector, that can be easily extended to the Ramond sector by supersymmetric transformations in target space. We give also an explicit construction for the Ramond coherent vertex operator. These constructions provide the use of the supersymmetric version of the Del Giudice-Di Vecchia-Fubini operators and Operator Product Expansion techniques, displaying manifest BRST invariance and after normal ordering also manifest covariance. As a consistency check we compute tree level three-point scattering amplitudes involving Neveu-Schwarz coherent vertex operators in different superghost pictures. Extending these results to the closed superstring, we give the expressions of the coherent vertex operators in the case of type IIA and IIB theories.

我们在Neveu-Schwarz区段中为超弦理论中的相干顶点算子提供了一个紧凑表达式，可以通过目标空间中的超对称变换轻松地将其扩展到Ramond区段。我们还给出了Ramond相干顶点算子的显式构造。这些构造提供了Del Giudice-Di Vecchia-Fubini运算符的超对称版本和运算符乘积扩展技术的使用，可显示明显的BRST不变性，并且在正常排序后还可以显示明显的协变性。作为一致性检查，我们计算在不同超重影图片中涉及Neveu-Schwarz相干顶点算符的树级三点散射幅度。将这些结果扩展到封闭的超串，我们给出了IIA型和IIB型理论中相干顶点算子的表达式。