Testing Bell inequalities in Higgs boson decays

• URL: http://arxiv.org/abs/2106.01377v4
• Date: Tue, 26 Jul 2022 11:25:04 GMT
• Title: Testing Bell inequalities in Higgs boson decays
• Authors: Alan Barr
• Abstract summary: Higgs boson decays produce pairs of $W$ bosons in a maximally entangled state, which can be expected to violate Bell inequalities. We show that the spin density matrix of the $Wpm pair may be reconstructed experimentally from the directions of the charged lepton decay products.
• Score: 0.0
• License: http://creativecommons.org/licenses/by-nc-nd/4.0/
• Abstract: Higgs boson decays produce pairs of $W$ bosons in a maximally entangled state, the spins of which can be expected to violate Bell inequalities. We show that the spin density matrix of the $W^\pm$ pair may be reconstructed experimentally from the directions of the charged lepton decay products, and from it the expectation values of various Bell operators determined. Numerical simulations of $H\rightarrow WW^*$ decays indicate that violation of a generalised CHSH inequality is unlikely to be measurable, however the CGLMP inequality is near-maximally violated. Experimental Bell tests could be performed at a variety of colliders and in different production channels. If reconstruction effects and backgrounds can be controlled then statistically significant violations could be observable even with datasets comparable to those already collected at the LHC.

Related papers

• An improved Bell-CHSH observable for gauge boson pairs [0.0]
  In this work, we consider Bell inequalities based on squares of spin operators. We find that our new choice of Bell operator has promising properties regarding states seen at colliders. We also conduct the first investigation of Bell violation in a system involving gauge bosons mediating different interactions.
  arXiv  Detail & Related papers  (2024-10-23T16:54:15Z)
• Tripartite entanglement from experimental data: $B^0\to K^{*0}μ^+μ^-$ as a case study [49.1574468325115]
  We develop an angular analysis based on the reconstruction of the helicity amplitudes from dedicated experimental data corresponding to the tripartite state composed by one qutrit and two qubits. As an application of our analysis, we performed a full quantum tomography of the final state in the $B0to K*0mu+mu-$ decays using data recorded by LHCb collaboration.
  arXiv  Detail & Related papers  (2024-09-19T18:10:14Z)
• Testing Bell inequalities and probing quantum entanglement at a muon collider [4.725524563065446]
  We present here the prospects of detecting quantum entanglement and the violation of Bell inequalities in H to ZZ to 4l events at a potential future muon collider. We show that the spin density matrix of the Z boson pairs can be reconstructed using the kinematics of the charged leptons from the Z boson decays.
  arXiv  Detail & Related papers  (2024-08-10T04:22:53Z)
• Entanglement and Bell inequality violation in $B\to \it{ΦΦ}$ decays [0.0]
  We show that the present LHCb data allows access to entanglement and to the Bell inequality violation with a significance exceeding the 5$sigma$ threshold. This demonstrates that the strong and electroweak interactions responsible for the $B$ meson decay act as a source of entanglement and the quantum mechanics nature of high-energy phenomena.
  arXiv  Detail & Related papers  (2024-08-09T11:46:06Z)
• Entanglement and Bell inequality violation in vector diboson systems produced in decays of spin-0 particles [44.99833362998488]
  We discuss conserving and the violation of the entanglementMP inequality in a system of two vector bosons produced in the decay of a spin-0 particle. As an exemplary process of this kind we use the decay $Hto ZZ$ with anomalous coupling.
  arXiv  Detail & Related papers  (2024-05-26T11:21:06Z)
• Robust spectral $\pi$ pairing in the random-field Floquet quantum Ising model [44.84660857803376]
  We study level pairings in the many-body spectrum of the random-field Floquet quantum Ising model. The robustness of $pi$ pairings against longitudinal disorder may be useful for quantum information processing.
  arXiv  Detail & Related papers  (2024-01-09T20:37:48Z)
• Entanglement and Bell inequalities violation in $H\to ZZ$ with anomalous coupling [44.99833362998488]
  We discuss entanglement and violation of Bell-type inequalities for a system of two $Z$ bosons produced in Higgs decays. We find that a $ZZ$ state is entangled and violates the inequality for all values of the pair (anomalous) coupling constant.
  arXiv  Detail & Related papers  (2023-07-25T13:44:31Z)
• $N$ Scaling of Large-Sample Collective Decay in Inhomogeneous Ensembles [44.99833362998488]
  We experimentally study collective decay of an extended disordered ensemble of $N$ atoms inside a hollow-core fiber. We observe up to $300$-fold enhanced decay rates, strong optical bursts and a coherent ringing.
  arXiv  Detail & Related papers  (2023-07-21T14:43:29Z)
• Observing super-quantum correlations across the exceptional point in a single, two-level trapped ion [48.7576911714538]
  In two-level quantum systems - qubits - unitary dynamics theoretically limit these quantum correlations to $2qrt2$ or 1.5 respectively. Here, using a dissipative, trapped $40$Ca$+$ ion governed by a two-level, non-Hermitian Hamiltonian, we observe correlation values up to 1.703(4) for the Leggett-Garg parameter $K_3$. These excesses occur across the exceptional point of the parity-time symmetric Hamiltonian responsible for the qubit's non-unitary, coherent dynamics.
  arXiv  Detail & Related papers  (2023-04-24T19:44:41Z)
• Bell inequalities and quantum entanglement in weak gauge bosons production at the LHC and future colliders [0.0]
  Quantum entanglement of weak interaction gauge bosons produced at colliders can be explored by computing the corresponding polarization density matrix. We consider the Higgs boson decays $Hto W W*$ and $Hto Z Z*$, in which $W*$ and $Z*$ are off-shell states. We show that a suitable instance of the Bell inequality is violated in $Hto Z Z*$ to a degree that can be tested at the LHC with future data.
  arXiv  Detail & Related papers  (2023-02-01T19:00:00Z)
• Quantum tops at the LHC: from entanglement to Bell inequalities [0.0]
  We introduce a unique set of observables suitable for both measurements, and then perform the corresponding analyses. We find that entanglement can be established at better than 5$sigma$ both at threshold as well as at high $p_T$ already in the LHC Run 2 dataset.
  arXiv  Detail & Related papers  (2021-10-19T17:07:28Z)

This list is automatically generated from the titles and abstracts of the papers in this site.

This site does not guarantee the quality of this site (including all information) and is not responsible for any consequences.