Some tree-level string amplitudes in the NSR formalism

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

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


Abstract: 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 F4 effective action. Finally we use the prescription of Kawai, Lewellen and Tye (KLT) to compute the amplitudes for the closed string sector.

Original languageEnglish (US)
Article number10
Pages (from-to)1-48
Number of pages48
JournalJournal of High Energy Physics
Issue number12
StatePublished - Dec 1 2015

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics


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