The reggeon vertex for DDF states

• DOI: 10.1007/jhep04(2025)073
• Publication Date: 2025-04-11T14:10:18Z
• Authors: Dripto Biswas; Raffaele Marotta; Igor Pesando

A bstract We provide a compact expression for the generating function of correlators involving an arbitrary number bosonic open string DDF states. The explicit M states can then be obtained by differentiating this with respect to polarization tensors. depends on single and double complex integrals centered around punctures corresponding insertion points vertices real axis in upper half-plane. have explicitly evaluated these To check our results, we computed some massive scalars spin-2 amplitudes = 3 4, verifying that form expected from Lorentz invariance. Moreover, first excited levels, also show generic polarizations reassembled into Lorentz-covariant amplitudes, emergent covariant match expressions comparing both formalisms.