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Article
Astronomy & Astrophysics
Alan J. Barr
Summary: The decay of Higgs boson can produce pairs of W bosons in a maximally entangled state, whose spin may violate Bell inequalities. Experimental reconstruction of the spin density matrix of the W-+/- pair shows near-maximal violation of the CGLMP inequality. Bell tests can be performed at various colliders, and statistically significant violations may be observable with controlled reconstruction effects and backgrounds.
Article
Physics, Particles & Fields
Rafiqul Rahaman et al.
Summary: We discuss a formalism for spin correlations and polarizations in two-particle systems with different spins. The formalism is demonstrated in the processes e-e+-> t t over line, gb -> tW-, and e-e+ -> ZZ in the standard model. We investigate the effect of anomalous couplings on polarizations and spin correlations in these processes and compare their strengths. The results show that spin correlations have the potential to provide a significant improvement over polarizations in probing anomalous couplings.
Article
Quantum Science & Technology
Yoav Afik et al.
Summary: The paper presents the general framework of the quantum state of a top-antitop quark pair produced through quantum chromodynamics in a high-energy collider. It discusses the presence of entanglement and CHSH violation in different regions of phase space and provides experimental observables for these signatures. The validity of the quantum tomography protocol for top-antitop pair is extended to more general quantum states and any production mechanism.
Article
Astronomy & Astrophysics
Rafael Aoude et al.
Summary: This study utilizes quantum information observables to probe the structure of fundamental interactions and search for new high energy physics. By investigating the effects of higher-dimensional operators in the Standard Model effective field theory on the Standard Model expectations, we find that higher-dimensional effects decrease the entanglement predicted in the Standard Model.
Article
Physics, Particles & Fields
J. A. Aguilar-Saavedra et al.
Summary: We discuss quantum entanglement in top pair production at the LHC. By restricting the velocity of the top pair system, we enhance the observables of entanglement. Furthermore, we design new observables that directly measure the relevant combinations of spin correlation coefficients involved in the measurement of entanglement and Bell inequalities. The statistical sensitivity is enhanced, up to a factor of 7 for Bell inequalities near threshold.
EUROPEAN PHYSICAL JOURNAL C
(2022)
Article
Physics, Particles & Fields
Claudio Severi et al.
Summary: This study presents the prospects of detecting quantum entanglement and the violation of Bell inequalities in (t)(t) events at the LHC. Using simulated events and unfolding techniques, the research finds that entanglement can be established accurately, but testing Bell inequalities is more challenging.
EUROPEAN PHYSICAL JOURNAL C
(2022)
Article
Physics, Multidisciplinary
M. Fabbrichesi et al.
Summary: Correlations between spin of top-quark pairs at a collider can be used to probe quantum entanglement at unexplored energies. A single observable can test the violation of Bell inequality with different confidence levels, taking into account detector effects. This test relies solely on spin correlations and does not require probabilistic determinations.
PHYSICAL REVIEW LETTERS
(2021)
Article
Physics, Particles & Fields
A. M. Sirunyan et al.
Summary: By measuring the production cross sections of the Higgs boson, the study confirms that the experimental results are consistent with the predictions of the standard model.
EUROPEAN PHYSICAL JOURNAL C
(2021)
Article
Physics, Multidisciplinary
Yoav Afik et al.
Summary: This research proposes the detection of entanglement between the spins of top-antitop-quark pairs at the LHC, representing the first proposal of entanglement detection in a pair of quarks, and also the entanglement observation at the highest energy scale so far. The study shows that entanglement can be observed by direct measurement of the angular separation between the leptons arising from the decay of the top-antitop pair, and develops a simple protocol for the quantum tomography of the top-antitop pair.
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(2021)
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J. A. Aguilar-Saavedra et al.
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Physics, Particles & Fields
Werner Bernreuther et al.
JOURNAL OF HIGH ENERGY PHYSICS
(2015)
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Physics, Particles & Fields
J. Alwall et al.
JOURNAL OF HIGH ENERGY PHYSICS
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Physics, Particles & Fields
S. Groote et al.
PHYSICS OF PARTICLES AND NUCLEI
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Optics
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Optics
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Physics, Multidisciplinary
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