TY  - JOUR
PB  - SciPost Foundation
DO  - 10.21468/SciPostPhys.19.2.052
TI  - Regge limit of one-loop string amplitudes
PY  - 2025/08/21
UR  - https://scipost.org/SciPostPhys.19.2.052
JF  - SciPost Physics
JA  - SciPost Phys.
VL  - 19
IS  - 2
SP  - 052
A1  - Banerjee, Pinaki
AU  - Eberhardt, Lorenz
AU  - Mizera, Sebastian
AB  - We study the high-energy limit of $2 \to 2$ one-loop string amplitudes at fixed momentum transfer. For the closed string, the high-energy behavior of the amplitudes can be determined from Regge theory just like in field theory, as was first discussed by Amati, Ciafaloni and Veneziano. However, field theory intuition partially breaks down for the open-string amplitude, where amplitudes can exhibit surprising asymptotics in the high-energy limit depending on the topology of the diagram. We call this phenomenon Regge attenuation. We extract Regge limits by a combination of unitarity cuts and saddle-point analysis. We show that the leading contribution of the planar open-string amplitude is sufficiently simple that we can extract it at any loop order. This allows us to resum the genus expansion in a certain limit and demonstrate that the leading Regge trajectory remains linear in that limit.
ER  -

@Article{10.21468/SciPostPhys.19.2.052,
	title={{Regge limit of one-loop string amplitudes}},
	author={Pinaki Banerjee and Lorenz Eberhardt and Sebastian Mizera},
	journal={SciPost Phys.},
	volume={19},
	pages={052},
	year={2025},
	publisher={SciPost},
	doi={10.21468/SciPostPhys.19.2.052},
	url={https://scipost.org/10.21468/SciPostPhys.19.2.052},
}