Decays of a neutral particle with zero spin and arbitrary CP parity into two off-mass-shell Z bosons

Abstract

Effects are investigated of CP symmetry violation in the decay of a scalar particle X (the Higgs boson) into two off-mass-shell Z bosons both decaying into a fermion-antifermion pair, $X\to Z_1^{\ast }{Z}_2^{\ast }\to f_1\overline{f_1}{f}_2\overline{f_2}$. The most general form of the amplitude of the transition $X\to Z_1^{\ast }{Z}_2^{\ast }$, wherein the boson X may not have definite CP parity, is considered. Limits of applicability of the narrow-Z-width approximation used when obtaining differential widths of the decay under consideration are determined. Various observables connected with the structure of the amplitude of the decay $X\to Z_1^{\ast }{Z}_2^{\ast }$ are studied. These observables are analyzed in the Standard Model, as well as in models conceding indefinite CP parity of the Higgs boson. An experimental measurement at the LHC of angular and invariant mass distributions of the decay $X\to Z_1^{\ast }{Z}_2^{\ast }\to f_1\overline{f_1}{f}_2\overline{f_2}$ can give information about the CP properties of the Higgs boson and its interaction with the Z boson.

23 pages, 5 figures; v2: references added, small changes; v3: list of references extended, minor numerical error corrected, constraints on hZZ coupling ratios compared with those of the CMS and ATLAS collaborations, version accepted for publication in JETP

References in corpus (15)

• 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
• Measurement of the properties of a Higgs boson in the four-lepton final state
• Study of the mass and spin-parity of the Higgs boson candidate via its decays to Z boson pairs
• Complex Singlet Extension of the Standard Model
• Constraints on the spin-parity and anomalous HVV couplings of the Higgs boson in proton collisions at 7 and 8 TeV
• Precise predictions for the Higgs-boson decay H -> W W/Z Z -> 4 leptons
• Constraints on the Higgs boson width from off-shell production and decay to Z-boson pairs
• Aspects of CP violation in the HZZ coupling at the LHC
• Narrow-width approximation accuracy
• Landau-Yang Theorem and Decays of a Z' Boson into Two Z Bosons
• Precision studies of the Higgs boson decay channel H -> ZZ -> 4l with MEKD
• Probing CP Violation in $h\to \gamma \gamma$ with Converted Photons
• Angular distribution and forward-backward asymmetry of the Higgs-boson decay to photon and lepton pair
• A higgs-like dilaton: viability and implications

Cited by in corpus (5)

• Entanglement and Bell inequalities violation in $H\to ZZ$ with anomalous coupling
• Entanglement and Bell inequality violation in vector diboson systems produced in decays of spin-0 particles
• Adding Pseudo-Observables to the Four-Lepton Experimentalist's Toolbox
• Higgs boson $ZZ$ couplings in Higgs-strahlung at the ILC
• Energy and angular distributions of the bottom quark in the electron-positron annihilation $e^{+}{e}^{-}\to b{W}^{+}\bar{t}$