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We discuss quantum entanglement in top pair production at the LHC. Near the t t̄ t t ¯ threshold, entanglement observables are enhanced by suppressing the contribution of q q̄ q q ¯ subprocesses, which is achieved by a simple cut on the velocity of the t t̄ t t ¯ system in the laboratory frame. Furthermore, we design new observables that directly measure the relevant combinations of tt̄ t t ¯ spin correlation coefficients involved in the measurement of entanglement and Bell inequalities. As a result, the statistical sensitivity is enhanced, up to a factor of 7 for Bell inequalities near threshold.
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Aguilar–Saavedra et al. (2022) studied this question.
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