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Stringent bounds on $HWW$ and $HZZ$ anomalous couplings with quantum tomography at the LHC
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abstract
Quantum tomography provides the full reconstruction of the density matrix of a state. We use it to study the Higgs boson decay into weak gauge bosons. Anomalous couplings beyond the Standard Model can be constrained by means of observables easily defined in terms of the polarization density matrix. We describe a strategy based on three observables that together provide the most stringent limits. Two of these observables are linked to the entanglement between the polarizations of the two gauge bosons, the other is based on CP-odd combinations of one momentum and two polarizations. We find for the $Z$ channel that this strategy offers, already with the available LHC data, limits competitive with the best available bounds. We argue that the inclusion of these observables in routine experimental analyses can lead to more stringent global fit limits.
Forward citations
Cited by 6 Pith papers
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Qubit-qubit-qutrit quantum correlations in $H \to f \bar f V$
In h→τ^-τ^+ Z decays, the spin state is genuinely qubit-qubit-qutrit entangled almost everywhere, violates Bell inequalities throughout, and carries up to 1.95 bits of non-local magic.
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Flavor--Kinetic Entanglement Production from Decay and Scattering at Finite Density
At finite density, the leading flavor-kinetic entanglement entropy equals twice the occupation-weighted branch-changing collision probability, and this quantity is used to diagnose first-order versus continuous therma...
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Quantum Tomography and Entanglement in Semi-Leptonic $h\to VV^*$ Decays at Higher Orders
Semi-leptonic h→VV* decays retain an effective two-qutrit quantum description under NLO QCD and electroweak corrections, unlike the fully leptonic h→4ℓ channel.
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Bell Inequality Violation of Light Quarks in Back-to-Back Dihadron Pair Production at Lepton Colliders
Using dihadron fragmentation functions as spin analyzers, the paper shows that Bell inequality violation in massless quark pairs can be probed through azimuthal correlations, with projected discovery significance from...
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The trace distance between density matrices, a nifty tool in new-physics searches
Using the trace distance between Standard Model and new-physics density matrices gives the strongest quantum-information bounds on anomalous top and tau couplings, along with first measurements of magic in collider data.
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Looking into the quantum entanglement in $H\to ZZ^\star$ at LHC within SMEFT framework
Using symmetrized angular asymmetries from simulated H->ZZ*->4l events, the authors reconstruct the ZZ* density matrix and report a positive concurrence lower bound for all scanned SMEFT couplings.
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