ATLAS reports an 8+ sigma excess in ttbar production near threshold, consistent with NRQCD quasi-bound states and measuring 9.3 pb.
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Observation of quantum entanglement in top-quark pairs using the ATLAS detector
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A factorization framework and two-qubit description allow photon pairs at lepton colliders to be treated as qubits for measuring Bell inequality violation, quantum discord, and nonstabilizerness using Belle data.
Higgs scattering in SMEFT is analyzed with von Neumann entropy, linear entropy, and concurrence as momentum-isospin entanglement measures, determined by Wilson coefficients of dimension-6 and dimension-8 operators, revealing energy growth, interference cancellations, suppression conditions, and link
Analysis of ~10 billion muon decays from Fermilab g-2 data shows 5.5σ Leggett-Garg inequality violation via reconstructed temporal polarization correlators.
A model of quantum decoherence from string breaking explains hyperon spin correlations by linking vacuum entanglement to observed data in non-perturbative QCD.
Spin-flavor entanglement in Lambda_b to Lambda D decays supplies a method to extract the CKM weak phase gamma with uncertainty scaling as 1 over the Wootters concurrence.
Chi_c0 decays exhibit maximal Bell violation and entanglement, chi_c1 shows angle-modulated violation, and chi_c2 baryon pairs are separable with no violation.
Calculates decoherence from radiation on a Bell-state fermion pair by mapping integrated Altarelli-Parisi splitting functions to Kraus operators of an open quantum system.
Proposal to measure diphoton entanglement at pp colliders via Bethe-Heitler conversion in the tracker, yielding simulated significances of 0.007σ for Higgs→γγ and 1.5σ for continuum q q̄→γγ at HL-LHC.
Links amplitude positivity to S-matrix entanglement consistency for flavored states, analyzes disentanglers, and introduces wave-packet regularization for entanglement expressions.
Toponium strengthens the spin-singlet component in top-quark pairs, substantially enhancing entanglement and enabling observable quantum steering at 10 sigma and Bell nonlocality at 9 sigma near threshold with current LHC data.
Hard final-state radiation measurably destroys the spin entanglement of fermion-antifermion pairs, and the effect should already be visible in LHC ttbar+jet and Belle II tau+tau-gamma data.
The paper derives regularized density matrix expressions and polarization correlations for double Compton scattering of entangled photons by enforcing unitarity at tree level, proposing a novel cross-section definition and drawing an analogy to Young's diffraction experiment.
Phenomenological calculation of entanglement entropies in B0 → VV decays shows strong dependence on relative phases and a correlation with branching fractions that the authors link to weak and strong interaction dynamics.
NLO QCD corrections enhance the γγ → ttbar cross section while leaving spin observables largely unchanged, with entanglement peaking near threshold and both entanglement and Bell nonlocality depending strongly on beam polarization.
SVD-based numerical method reconstructs the two-fold ambiguous tau momenta in pi nu decays and shows entanglement observables remain extractable despite unresolved solutions.
The linearly polarized gluon distribution enhances entanglement of heavy quark pairs in electron-nucleus collisions when total and relative transverse momenta are orthogonal.
Derives algebraic conditions under which an LHVT reproduces QFT angular correlations in ZZ leptonic decays, existing only for a unique state and restricted θ_W when w≠0.
A one-operator-at-a-time sensitivity analysis identifies the collider observables providing the strongest individual constraints on top-quark SMEFT operators from current and projected data.
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Observation of a cross-section enhancement near the $t\bar{t}$ production threshold in $\sqrt{s}=13$ TeV $pp$ collisions with the ATLAS detector
ATLAS reports an 8+ sigma excess in ttbar production near threshold, consistent with NRQCD quasi-bound states and measuring 9.3 pb.
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Quantum Information of Photon Pairs at Lepton Colliders
A factorization framework and two-qubit description allow photon pairs at lepton colliders to be treated as qubits for measuring Bell inequality violation, quantum discord, and nonstabilizerness using Belle data.
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Higgs Scattering and Entanglement in SMEFT
Higgs scattering in SMEFT is analyzed with von Neumann entropy, linear entropy, and concurrence as momentum-isospin entanglement measures, determined by Wilson coefficients of dimension-6 and dimension-8 operators, revealing energy growth, interference cancellations, suppression conditions, and link
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Leggett-Garg Inequality Violation in Muon $g-2$ Experiments
Analysis of ~10 billion muon decays from Fermilab g-2 data shows 5.5σ Leggett-Garg inequality violation via reconstructed temporal polarization correlators.
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Quantum decoherence of hyperon spin correlations in QCD hadronization
A model of quantum decoherence from string breaking explains hyperon spin correlations by linking vacuum entanglement to observed data in non-perturbative QCD.
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Spin-flavor entanglement in $\Lambda_b \to \Lambda D$ and weak phase extraction
Spin-flavor entanglement in Lambda_b to Lambda D decays supplies a method to extract the CKM weak phase gamma with uncertainty scaling as 1 over the Wootters concurrence.
-
Bell nonlocality and entanglement in $\chi_{cJ}$ decays into baryon pair
Chi_c0 decays exhibit maximal Bell violation and entanglement, chi_c1 shows angle-modulated violation, and chi_c2 baryon pairs are separable with no violation.
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Decoherence effects in entangled fermion pairs at colliders
Calculates decoherence from radiation on a Bell-state fermion pair by mapping integrated Altarelli-Parisi splitting functions to Kraus operators of an open quantum system.
-
Quantum entanglement of photon pairs at proton-proton colliders
Proposal to measure diphoton entanglement at pp colliders via Bethe-Heitler conversion in the tracker, yielding simulated significances of 0.007σ for Higgs→γγ and 1.5σ for continuum q q̄→γγ at HL-LHC.
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Positivity in Amplitudes and Quantum Entanglement
Links amplitude positivity to S-matrix entanglement consistency for flavored states, analyzes disentanglers, and introduces wave-packet regularization for entanglement expressions.
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Toponium effects on quantum steering and Bell nonlocality of top quarks
Toponium strengthens the spin-singlet component in top-quark pairs, substantially enhancing entanglement and enabling observable quantum steering at 10 sigma and Bell nonlocality at 9 sigma near threshold with current LHC data.
-
Experimental prospects for quantum decoherence measurements at colliders
Hard final-state radiation measurably destroys the spin entanglement of fermion-antifermion pairs, and the effect should already be visible in LHC ttbar+jet and Belle II tau+tau-gamma data.
-
Regularized Compton double scattering via unitarity
The paper derives regularized density matrix expressions and polarization correlations for double Compton scattering of entangled photons by enforcing unitarity at tree level, proposing a novel cross-section definition and drawing an analogy to Young's diffraction experiment.
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Quantum Correlations in the Decay of $B^0$ meson and Entanglement Entropy
Phenomenological calculation of entanglement entropies in B0 → VV decays shows strong dependence on relative phases and a correlation with branching fractions that the authors link to weak and strong interaction dynamics.
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Spin correlations and quantum entanglement in $\gamma\gamma \to t\bar t$ at polarized photon colliders with NLO QCD corrections
NLO QCD corrections enhance the γγ → ttbar cross section while leaving spin observables largely unchanged, with entanglement peaking near threshold and both entanglement and Bell nonlocality depending strongly on beam polarization.
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Revealing the Two-Fold Ambiguity: Tau Momentum Reconstruction and Its Impact on Entanglement Observables
SVD-based numerical method reconstructs the two-fold ambiguous tau momenta in pi nu decays and shows entanglement observables remain extractable despite unresolved solutions.
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Quantum entanglement in electron-nucleus collisions: Role of the linearly polarized gluon distribution
The linearly polarized gluon distribution enhances entanglement of heavy quark pairs in electron-nucleus collisions when total and relative transverse momenta are orthogonal.
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Does the Weinberg angle allow a local hidden-variable description for the leptonic decays of an entangled $ZZ$ pair?
Derives algebraic conditions under which an LHVT reproduces QFT angular correlations in ZZ leptonic decays, existing only for a unique state and restricted θ_W when w≠0.
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Sensitivity Analysis of the Top-Quark Sector
A one-operator-at-a-time sensitivity analysis identifies the collider observables providing the strongest individual constraints on top-quark SMEFT operators from current and projected data.