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arXiv 1507.02172hep-th
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NSR形式中的一些树水平弦振幅

Some tree-level string amplitudes in the NSR formalism

Katrin Becker, Melanie Becker, Ilarion V. Melnikov, Daniel Robbins, Andrew B. Royston

摘要:

我们计算树级散射振幅开弦使用NSR形式主义。我们提出了一个精简的基于几何和教学方法的计算,我们首先开发检查两个,三个,四点函数涉及玻色子和费米子。我们计算了无质量胶子的五点振幅,发现与Brandt,Machado和Medina的早期结果一致。然后,我们分别计算了涉及两个和四个费米子的五点振幅,其一般形式在NSR形式主义中还没有得到。结果很好地证实了超对称$F^4$有效作用的预期。最后,我们使用Kawai,Lewellen和Tye(KLT)的处方来计算闭弦扇区的振幅。

英文摘要:

We calculate tree level scattering amplitudes for open strings using the NSR formalism. We present a streamlined symmetry-based and pedagogical approach to the computations, which we first develop by checking two-, three-, and four-point functions involving bosons and fermions. We calculate the five-point amplitude for massless gluons and find agreement with an earlier result by Brandt, Machado and Medina. We then compute the five-point amplitudes involving two and four fermions respectively, the general form of which has not been previously obtained in the NSR formalism. The results nicely confirm expectations from the supersymmetric $F^4$ effective action. Finally we use the prescription of Kawai, Lewellen and Tye (KLT) to compute the amplitudes for the closed string sector.

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