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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 dimensionalschemes to reveal subtleties involving infrared divergence cancellation and$\gamma_5$-matrix issues. Besides the absence of evanescent fields in IReg,such as $\epsilon$-scalars required in certain schemes that operate partiallyin the physical dimension, we verify that our procedure preserves gaugeinvariance in the presence of the $\gamma_5$ matrix without requiring symmetrypreserving counterterms while the amplitude is infrared finite as required bythe KLN theorem.

Infrared Subtleties and Chiral Vertices at NLO: An Implicit Regularization Analysis