CP violation in the HZZ vertex and left-right asymmetries

2025/01/30 by A. I. Hernández-Juárez, Hernández-Juárez, A. I., R. Gaitán +1 · 1 citation
Engineering · Mathematics · #Combinatorics #Engineering #FOS: Physical sciences #Graph #High Energy Physics - Phenomenology (hep-ph) #Left and right #Mathematical Approximation and Integration #Mathematics #Random Matrices and Applications #Vertex (graph theory)

paper · pdf · doi:10.48550/arxiv.2501.18807

openalex publication_date 2025/01/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

We investigate new contributions to the HZZ vertex from the Flavor Changing Neutral Current (FCNC) involving the Higgs and Z bosons. Our calculations reveal that the form factors h₂^V and h₃^V (V=H, Z) can be induced through these couplings, and we present our results in terms of the Passarino-Veltman scalar functions. Using the current limits on Htc and Ztc couplings, we determine that the new contributions to the CP-conserving form factor h₂^V are small compared to the Standard Model (SM) predictions. However, for the CP-violating form factor h₃^V, the contributions can reach values as high as 10^-6, five orders of magnitude larger than in the SM. Furthermore, we examine how these results influence the left-right asymmetries in the processes H^∗→ ZZ and Z^∗→ ZH. Our findings suggest that significant deviations from SM predictions may occur when considering FCNC contributions.

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