Towards a recursive construction of string scattering amplitudes

Arkajyoti Manna

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arXiv · 2611.09398

Towards a recursive construction of string scattering amplitudes

Arkajyoti Manna

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Abstract

We construct open superstring scattering amplitudes from three-point data using the Britto-Cachazo-Feng-Witten (BCFW) recursion and four-dimensional spinor helicity variables. We compute the contributions of selected leading and subleading Regge families to the color-ordered four-gluon amplitude by sewing their cubic couplings and summing over intermediate polarizations. The four-dimensional description makes helicity selection rules explicit and reduces the massive polarization sums to SU(2) little group contractions. The resulting residues are expressed in terms of Jacobi and Legendre polynomials, yielding explicit sums over mass levels. We construct a differential operator relating the two polynomial kernels, including their level-dependent normalizations. These results provide a concrete starting point for organizing the infinite intermediate-state sum and investigating whether relations among Regge families can support a recursive reconstruction of the full string amplitude.

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Arkajyoti Manna. 2026-11-06. Towards a recursive construction of string scattering amplitudes. https://arxiv.org/abs/2611.09398

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