Guillen Max, Johansson Henrik, Lipinski Jusinskas Renann, Schlotterer Oliver
Department of Physics and Astronomy, Uppsala University, Box 516, 75120 Uppsala, Sweden.
Nordita, Stockholm University and KTH Royal Institute of Technology, Hannes Alfvéns väg 12, 10691 Stockholm, Sweden.
Phys Rev Lett. 2021 Jul 30;127(5):051601. doi: 10.1103/PhysRevLett.127.051601.
We present a new method, exact in α^{'}, to explicitly compute string tree-level amplitudes involving one massive state and any number of massless ones. This construction relies on the so-called twisted heterotic string, which admits only gauge multiplets, a gravitational multiplet, and a single massive supermultiplet in its spectrum. In this simplified model, we determine the moduli-space integrand of all amplitudes with one massive state using Berends-Giele currents of the gauge multiplet. These integrands are then straightforwardly mapped to gravitational amplitudes in the twisted heterotic string and to the corresponding massive amplitudes of the conventional type-I and type-II superstrings.
我们提出了一种在α′精确的新方法，用于显式计算涉及一个有质量态和任意数量无质量态的弦树图振幅。这种构造依赖于所谓的扭曲杂化弦，其谱中仅包含规范多重态、引力多重态和单个有质量超多重态。在这个简化模型中，我们使用规范多重态的贝伦兹 - 吉勒电流来确定所有包含一个有质量态的振幅的模空间被积函数。然后，这些被积函数可以直接映射到扭曲杂化弦中的引力振幅以及传统I型和II型超弦的相应有质量振幅。
