One-loop off-shell amplitudes from classical equations of motion

0579751 - FZÚ 2024 RIV US eng J - Journal Article
Gomez, H. - Lipinski Jusinskas, Renann - Lopez-Arcos, C. - Velez, A.Q.
One-loop off-shell amplitudes from classical equations of motion.
Physical Review Letters. Roč. 130, č. 8 (2023), č. článku 081601. ISSN 0031-9007. E-ISSN 1079-7114
Institutional support: RVO:68378271
Keywords : classical solutions in field theory * field and string theory models and techniques * scattering amplitudes
OECD category: Particles and field physics
Impact factor: 8.6, year: 2022
Method of publishing: Open access

In this Letter, we present a recursive method for computing one-loop off-shell integrands in colored quantum field theories. First, we generalize the perturbiner method by recasting the multiparticle currents as generators of off-shell tree-level amplitudes. After, by taking advantage of the underlying color structure, we define a consistent sewing procedure to iteratively compute the one-loop integrands. When gauge symmetries are involved, the whole procedure is extended to multiparticle solutions involving ghosts, which can then be accounted for in the full loop computation. Since the required input here is equations of motion and gauge symmetry, our framework naturally extends to one-loop computations in certain non-Lagrangian field theories.
Permanent Link: https://hdl.handle.net/11104/0348570