$CP$ violation in the $HZZ$ vertex and left-right asymmetries

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 $h_2^V$ 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 $H\overline{t}c$ and $Z\overline{t}c$ couplings, we determine that the new contributions to the $CP$-conserving form factor $h_2^V$ are small compared to the Standard Model (SM) predictions. However, for the $CP$-violating form factor $h_3^V$, 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 $H^{\ast }\to ZZ$ and $Z^{\ast }\to ZH$. Our findings suggest that significant deviations from SM predictions may occur when considering FCNC contributions.

To be published in PRD

References in corpus (52)

• Observation of a new particle in the search for the Standard Model Higgs boson with the ATLAS detector at the LHC
• Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC
• A portrait of the Higgs boson by the CMS experiment ten years after the discovery
• A detailed map of Higgs boson interactions by the ATLAS experiment ten years after the discovery
• Precise predictions for the Higgs-boson decay H -> W W/Z Z -> 4 leptons
• Measurements of the Higgs boson width and anomalous HVV couplings from on-shell and off-shell production in the four-lepton final state
• Aspects of CP violation in the HZZ coupling at the LHC
• FeynCalc 10: Do multiloop integrals dream of computer codes?
• Testing entanglement and Bell inequalities in $H\to ZZ$
• Search for the lepton flavor violating decay $Z\to e\mu$ in pp collisions at $\sqrt{s}$ = 8 TeV with the ATLAS detector
• Constraints on anomalous Higgs boson couplings using production and decay information in the four-lepton final state
• Measuring the Higgs-Vector boson Couplings at Linear $e^{+}{e}^{-}$ Collider
• Search for lepton-flavor violating decays of the Higgs boson in the $\mu \tau$ and e$\tau$ final states in proton-proton collisions at $\sqrt{s}$ = 13 TeV
• Constraints on anomalous Higgs boson couplings to vector bosons and fermions in its production and decay using the four-lepton final state
• Measurement of the Higgs boson width and evidence of its off-shell contributions to ZZ production
• Entanglement and Bell inequalities violation in $H\to ZZ$ with anomalous coupling
• $ZH$ production in gluon fusion: two-loop amplitudes with full top quark mass dependence
• Measurements of production cross sections of polarized same-sign W boson pairs in association with two jets in proton-proton collisions at $\sqrt{s}=$ 13 TeV
• Evidence for the Higgs boson decay to a $Z$ boson and a photon at the LHC
• Probing Minimal Flavor Violation at the LHC
• Search for Higgs boson decays to a Z boson and a photon in proton-proton collisions at $\sqrt{s}$ = 13 TeV
• Evidence of off-shell Higgs boson production from $ZZ$ leptonic decay channels and constraints on its total width with the ATLAS detector
• Combination of the W boson polarization measurements in top quark decays using ATLAS and CMS data at $\sqrt{s}=$ 8 TeV
• Vector boson polarizations in the decay of the Standard Model Higgs
• From angular coefficients to quantum observables: a phenomenological appraisal in di-boson systems
• Anomalous couplings in associated $VH$ production with Higgs decay to massive $b$ quarks at NNLO in QCD
• Probing tqZ anomalous couplings in the trilepton signal at the HL-LHC, HE-LHC and FCC-hh
• Contributions to $ZZ{V}^{\ast }$ ($V=\gamma ,Z,Z^{\prime }$) couplings from $CP$ violating flavor changing couplings
• New estimate of the chromomagnetic dipole moment of quarks in the standard model
• Observation of gauge boson joint-polarisation states in $W^{\pm }Z$ production from $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
• Off-shell Higgs Couplings in $H^{\ast }\to ZZ\to \ell \ell \nu \nu$
• Study of anomalous gauge-Higgs couplings using $Z$ boson polarization at LHC
• Anomalous Higgs Couplings at an $e\gamma$ Collider
• NLO electroweak corrections to doubly-polarized $W^{+}{W}^{-}$ production at the LHC
• Search for the charged-lepton-flavor-violating decay $Z\to e\mu$ in $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
• Constraints on anomalous Higgs boson couplings to vector bosons and fermions from the production of Higgs bosons using the $\tau \tau$ final state
• Polarized ZZ pairs in gluon fusion and vector boson fusion at the LHC
• A precise measurement of the Z-boson double-differential transverse momentum and rapidity distributions in the full phase space of the decay leptons with the ATLAS experiment at $\sqrt{s}$ = 8 TeV
• A new evaluation of the $HZZ$ coupling: direct bounds on anomalous contributions and $CP$ violating effects via a new asymmetry
• Evidence of pair production of longitudinally polarised vector bosons and study of CP properties in $ZZ\to 4\ell$ events with the ATLAS detector at $\sqrt{s}=13$ TeV
• Search for flavor-changing neutral-current couplings between the top quark and the $Z$ boson with proton-proton collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
• Chromomagnetic and chromoelectric dipole moments of quarks in the reduced 331 model
• Search for flavor-changing neutral $tqH$ interactions with $H\to \gamma \gamma$ in $pp$ collisions at $\sqrt{s}$ = 13 TeV using the ATLAS detector
• Measuring Higgs self couplings in the presence of VVH and VVHH at the ILC
• Bounds on the absorptive parts of the chromomagnetic and chromoelectric dipole moments of the top quark from LHC data
• Measurement of the polarisation of $W$ bosons produced in top-quark decays using dilepton events at $\sqrt{s}=13$ TeV with the ATLAS experiment
• Scotogenic top-quark FCNC decays
• Form Factors in Higgs Couplings from Physics Beyond the Standard Model
• Polarized and unpolarized off-shell $H^{\ast }\to ZZ\to 4\ell$ decay above the $2m_Z$ threshold
• $H\to Z\gamma$ decay and $CP$ violation
• Non-diagonal contributions to $Z\gamma V^{\ast }$ vertex, polarizations and bounds on $Z\overline{t}q$ couplings
• One-loop formulas for $H\to Z{\nu }_l{\bar{\nu }}_l$ for $l=e,\mu ,\tau$ in 't Hooft-Veltman gauge

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