Open Access

$C P$ violation in the $H Z Z$ vertex and left-right asymmetries

Departamento de Física, FES-Cuautitlán, Universidad Nacional Autónoma de México, Código Postal 54770, Estado de México, México

^*Contact author: alan.hernandez@cuautitlan.unam.mx

Phys. Rev. D 112, 033006 – Published 19 August, 2025

DOI: https://doi.org/10.1103/g124-ttp5

Abstract

We investigate new contributions to the $H Z Z$ vertex from the flavor changing neutral current (FCNC) involving the Higgs and $Z$ bosons. Our calculations reveal that the form factors $h_{2}^{V}$ and $h_{3}^{V}$ ( $V = H$ , $Z$ ) can be induced through these couplings, and we present our results in terms of the Passarino-Veltman scalar functions. Using the current limits on $H \bar{t} c$ and $Z \bar{t} c$ couplings, we determine that the new contributions to the $C P$ -conserving form factor $h_{2}^{V}$ are small compared to the Standard Model (SM) predictions. However, for the $C P$ -violating form factor $h_{3}^{V}$ , the contributions can reach values as high as $10^{- 6}$ , 5 orders of magnitude larger than in the SM. Furthermore, we examine how these results influence the left-right asymmetries in the processes $H^{*} \to Z Z$ and $Z^{*} \to Z H$ . Our findings suggest that significant deviations from SM predictions may occur when considering FCNC contributions.

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Article Text

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Phys. Rev. D 112, 033006– Published 19 August, 2025

Vol. 112, Iss. 3 — 1 August 2025

Received 7 March 2025
Accepted 24 July 2025

DOI: https://doi.org/10.1103/g124-ttp5

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP³.

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$C P$ violation in the $H Z Z$ vertex and left-right asymmetries

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CP violation in the HZZ vertex and left-right asymmetries

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$C P$ violation in the $H Z Z$ vertex and left-right asymmetries