Transverse polarization in e+e- collisions generates maximally entangled fermion pairs in QED processes and boosts entanglement in electroweak and Bhabha scattering.
Mahlon and S.J
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abstract
A comparison is made between the off-diagonal and helicity spin bases for top quark pair production at the FNAL Tevatron. In the off-diagonal basis, 92% of the top quark pairs are in the spin configuration up-down plus down-up, whereas in the helicity basis only 70% are left-right plus right-left. The off-diagonal basis maximizes the spin asymmetry and hence the measured angular correlations between the decay products, which are more than twice as big in this basis as compared to the helicity basis. In addition, for the process q qbar --> t tbar, we give a very simple analytic expression for the matrix element squared which includes all spin correlations between the production and subsequent decay of the top quarks.
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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.
citing papers explorer
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Spin Correlation and Quantum Entanglement of Fermion Pairs in Transversely Polarized $e^-e^+$ Collisions
Transverse polarization in e+e- collisions generates maximally entangled fermion pairs in QED processes and boosts entanglement in electroweak and Bhabha scattering.
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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.