Infrared subtleties and chiral vertices at NLO: an implicit regularization analysis Rosado, Ricardo J. C. Cherchiglia, Adriano Sampaio, Marcos Hiller, Brigitte 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 2023-11-13T09:31:34Z 2023-11-13T09:31:34Z 2023-09-28 journal article Rosado, R.J.C., Cherchiglia, A., Sampaio, M. et al. Infrared subtleties and chiral vertices at NLO: an implicit regularization analysis. Eur. Phys. J. C 83, 879 (2023). [https://doi.org/10.1140/epjc/s10052-023-12052-2] https://hdl.handle.net/10481/85607 10.1140/epjc/s10052-023-12052-2 eng http://creativecommons.org/licenses/by/4.0/ open access Atribución 4.0 Internacional Springer Nature