Quantum Entanglement is Quantum: ZZ Production at the LHC

Abstract

Polarization and spin correlations in diboson systems serve as powerful tools for precision tests and searches for new physics. Recently, interpreting these observables through the lens of quantum information, for instance by examining whether the diboson systems exhibit entanglement, has introduced a compelling new dimension to these studies. We analyze the angular coefficients in the processes $pp\to e^{+}{e}^{-}{\mu }^{+}{\mu }^{-}$ and $h\to e^{+}{e}^{-}{\mu }^{+}{\mu }^{-}$, incorporating higher-order QCD and electroweak corrections. Guided by the fundamental properties of the spin density matrix, we assess the stability of the two-qutrit interpretation under radiative effects. For the $pp\to e^{+}{e}^{-}{\mu }^{+}{\mu }^{-}$ process, NLO QCD corrections preserve the two-qutrit structure but weaken entanglement indicators, an effect that can be partially mitigated by jet binning. In contrast, electroweak corrections introduce non-factorizable contributions that modify the quantum properties of the system. While these effects can be largely depleted by selecting events with a double-resonant $ZZ$ structure, such a kinematic handle is not available for Higgs decays. In the $h\to e^{+}{e}^{-}{\mu }^{+}{\mu }^{-}$ channel, singly-resonant NLO electroweak corrections substantially distort the angular coefficients, challenging the description of these events as a two-qutrit system.

37 pages, 14 figures, 9 tables. Updated to match the published version

References in corpus (66)

• Entanglement of Formation of an Arbitrary State of Two Qubits
• The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations
• The anti-k_t jet clustering algorithm
• Mixed State Entanglement and Quantum Error Correction
• Separability Criterion for Density Matrices
• A general framework for implementing NLO calculations in shower Monte Carlo programs: the POWHEG BOX
• A New Method for Combining NLO QCD with Shower Monte Carlo Algorithms
• Matching NLO QCD computations with Parton Shower simulations: the POWHEG method
• On the Measurement of Qubits
• Separability criterion and inseparable mixed states with positive partial transposition
• Precision Electroweak Measurements on the Z Resonance
• Universal state inversion and concurrence in arbitrary dimensions
• Parton distributions with QED corrections
• Non-maximally entangled states: production, characterization and utilization
• Electroweak corrections to charged-current e+e- --> 4 fermion processes - technical details and further results
• ZZ production at hadron colliders in NNLO QCD
• Predictions for all processes e^+e^- -> 4 fermions + gamma
• Monte Carlo errors with less errors
• Qudit Quantum State Tomography
• RECOLA: REcursive Computation of One-Loop Amplitudes
• Recola2: REcursive Computation of One-Loop Amplitudes 2
• Entanglement and quantum tomography with top quarks at the LHC
• Recursive generation of one-loop amplitudes in the Standard Model
• An observable entanglement measure for unknown mixed quantum states
• Mass Effects in the Higgs-Gluon Coupling: Boosted vs Off-Shell Production
• Entanglement Suppression and Emergent Symmetries of Strong Interactions
• Electroweak two-loop corrections to the effective weak mixing angle
• Quantum tops at the LHC: from entanglement to Bell inequalities
• Quantum information with top quarks in QCD
• Low Energy Tests of the Weak Interaction
• Improved tests of entanglement and Bell inequalities with LHC tops
• Quantum discord and steering in top quarks at the LHC
• Maximal Entanglement in High Energy Physics
• Quantum state tomography, entanglement detection and Bell violation prospects in weak decays of massive particles
• Bell inequalities and quantum entanglement in weak gauge bosons production at the LHC and future colliders
• Automatic differentiation for error analysis of Monte Carlo data
• A model independent spin analysis of fundamental particles using azimuthal asymmetries
• Radiative Corrections in Precision Electroweak Physics: a Historical Perspective
• Quantum entanglement and top spin correlations in SMEFT at higher orders
• When the Machine Chimes the Bell: Entanglement and Bell Inequalities with Boosted $t\bar{t}$
• NLO electroweak corrections in extended Higgs Sectors with RECOLA2
• Polarized Moller Scattering Asymmetries
• Entanglement and Bell inequalities violation in $H\to ZZ$ with anomalous coupling
• pyerrors: a python framework for error analysis of Monte Carlo data
• Quantum tops at circular lepton colliders
• PROPHECY4F 3.0: A Monte Carlo program for Higgs-boson decays into four-fermion final states in and beyond the Standard Model
• Anomalous triple gauge boson couplings in $ZZ$ production at the LHC and the role of $Z$ boson polarizations
• NLO QCD+NLO EW corrections to diboson production matched to parton shower
• Breaking down the entire spectrum of spin correlations of a pair of particles involving fermions and gauge bosons
• Isolating semi-leptonic $H\to W{W}^{\ast }$ decays for Bell inequality tests
• On the direct determination of ${\sin }^2{\theta }_{eff}^{\ell }$ at hadron colliders
• Optimizing Fictitious States for Bell Inequality Violation in Bipartite Qubit Systems
• Quantum Information meets High-Energy Physics: Input to the update of the European Strategy for Particle Physics
• Fiducial polarization observables in hadronic WZ production: A next-to-leading order QCD+EW study
• The Z boson spin observables as messengers of new physics
• From angular coefficients to quantum observables: a phenomenological appraisal in di-boson systems
• Three-body Entanglement in Particle Decays
• Unravelling the anomalous gauge boson couplings in $Z{W}^{\pm }$ production at the LHC and the role of spin-$1$ polarizations
• Quantum properties of $H\to V{V}^{\ast }$: precise predictions in the SM and sensitivity to new physics
• Boosting New Physics Searches in $t\bar{t}Z$ and $tZj$ Production with Angular Moments
• GRIFFIN: A C++ library for electroweak radiative corrections in fermion scattering and decay processes
• Entanglement and Bell inequality violation in vector diboson systems produced in decays of spin-0 particles
• Spin Correlations in $t\bar{t}$ Production and Decay at the LHC in QCD Perturbation Theory
• Hadronic Top Quark Polarimetry with ParticleNet
• Analytical Insights on Hadronic Top Quark Polarimetry
• Higher-Order Corrections to Quantum Observables in $h\to W{W}^{\ast }$

Cited by in corpus (1)

• Qubit entanglement from forward scattering