https://doi.org/10.1140/epjc/s10052-023-12052-2
Regular Article - Theoretical Physics
Infrared subtleties and chiral vertices at NLO: an implicit regularization analysis
1
CFisUC, Department of Physics, University of Coimbra, 3004-516, Coimbra, Portugal
2
Instituto de Física Gleb Wataghin, Universidade Estadual de Campinas, Rua Sérgio Buarque de Holanda, 777, Campinas, SP, Brazil
3
Departamento de Física Teórica y del Cosmos, Universidad de Granada, Campus de Fuentenueva, 18071, Granada, Spain
4
Universidade Federal do ABC, 09210-580, Santo André, Brazil
Received:
22
May
2023
Accepted:
18
September
2023
Published online:
28
September
2023
We employ implicit regularization (IReg) in quark-antiquark decays of the Z, or of a scalar (CP-even or odd) boson at NLO, and compare with dimensional schemes to reveal subtleties involving infrared divergence cancellation and 
-matrix issues. Besides the absence of evanescent fields in IReg, such as 
-scalars required in certain schemes that operate partially in the physical dimension, we verify that our procedure preserves gauge invariance in the presence of the matrix without requiring symmetry preserving counterterms while the amplitude is infrared finite as stated by the KLN theorem.
© The Author(s) 2023
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