Infrared subtleties and chiral vertices at NLO: an implicit regularization analysis Rosado, Ricardo J. C. Cherchiglia, Adriano Sampaio, Marcos Hiller, Brigitte We acknowledge support from Fundação para a Ciência eTecnologia (FCT) through the projectsCERN/FIS-PAR/0040 /2019, CERN /FIS-COM /0035 /2019, UID /FIS /04564 /2020, and the grant FCT 2020.07172.BD. A.C. acknowledges support from National Council for Scientific and Technological Development - CNPq through projects 166523/2020-8 and 201013/2022-3 and M. Sampaio acknowledges support from CNPq through grant 302790/2020-9. 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. 2023-10-31T09:01:48Z 2023-10-31T09:01:48Z 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/10481/85356 10.1140/epjc/s10052-023-12052-2 eng http://creativecommons.org/licenses/by/4.0/ open access Atribución 4.0 Internacional Springer Nature