标题： 质量无关的超场表示和使用纯自旋形式的树幅 显示英文标题

标题： Massless representation of massive superfields and tree amplitudes with the pure spinor formalism

摘要： 我们从无质量顶点的OPE构造开超弦理论第一质量级的非积分顶点算符。 通过BRST上同调操作，两个无质量态和一个有质量态的树图振幅被重写为无质量四点振幅在${\alpha^\prime}^2$级别的纯自旋子超空间运动学表达式。 发现了一个关于包含一个有质量态的部分$n$点树图振幅与n+1个无质量振幅的${\alpha^\prime}^2$修正的线性组合之间的推广关系，并证明其与单位性一致。 显示英文摘要

摘要： We construct the unintegrated vertex operator at the first mass level of the open superstring from the OPE of massless vertices. Using BRST cohomology manipulations, the tree amplitude of two massless and one massive state is rewritten in terms of the pure spinor superspace kinematic expression of the massless four-point amplitude at the ${\alpha^\prime}^2$ level. A generalization relating the partial $n$-point tree amplitudes with one massive state and linear combinations of the ${\alpha^\prime}^2$ corrections to n+1 massless amplitudes is found and shown to be consistent with unitarity.