Speaker
Ricardo Jorge Carvalho Rosado
(CFisUC, Department of Physics, University of Coimbra, P-3004-516 Coimbra, Portugal)
Description
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 $\gamma_5$-matrix issues. Besides the absence of evanescent fields in IReg, such as $\epsilon$-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 $\gamma_5$ matrix without requiring symmetry preserving counterterms while the amplitude is infrared finite as required by the KLN theorem.
Authors
Dr
Adriano Cherchiglia
(nstituto de Física Gleb Wataghin, Universidade Estadual de Campinas, Rua Sérgio Buarque de Holanda, 777, Campinas, SP, Brasil)
Dr
Brigitte Hiller
(CFisUC, Department of Physics, University of Coimbra, P-3004-516 Coimbra, Portugal)
Dr
Marcos Sampaio
(Universidade Federal do ABC, 09210-580 , Santo André, Brasil)
Ricardo Jorge Carvalho Rosado
(CFisUC, Department of Physics, University of Coimbra, P-3004-516 Coimbra, Portugal)
