Chiral Closed strings: Four massless states scattering amplitude

Abstract

We compute the scattering amplitudes of four massless states for chiral (closed) bosonic and type II superstrings using the Kawai-Lewellen-Tye ($KLT$) factorization method. The amplitude in the chiral bosonic case is identical to a field theory amplitude corresponding to the spin-$2$ tachyon, massless gravitational sector and massive spin-2 tardyon states of the spectrum. Chiral type II superstrings amplitude only possess poles associated with the massless gravitational sector. We briefly discuss the extension of the calculation to heterotic superstrings.

arXiv comment30 pages, typos fixed, the numbering of the equations is slightly different from the corrected version accepted in JHEP due to different macros Latex packages

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• On integrands and loop momentum in string and field theory
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• A String Deformation of the Parke-Taylor Factor
• Chiral strings, the sectorized description and their integrated vertex operators
• A Note on Circle Compactification of Tensile Ambitwistor String
• Chiral Superstring and CHY Amplitude
• Green-Schwarz and Pure Spinor Formulations of Chiral Strings
• Massive strings from a haunted field theory
• On an alternative quantization of R-NS strings
• One-loop matrix elements of effective superstring interactions: ${\alpha }^{\prime }$-expanding loop integrands