Separating entanglement at emission from femtoscopic correlations

Abstract:We investigate how femtoscopic correlations modify the relation between the spin entanglement of emitted particle pairs and that of pairs selected at a given relative momentum. For two spin-$\frac{1}{2}$ particles, we show that the momentum-selected spin state can be entangled even when the corresponding state at emission is separable. We derive a momentum-dependent separability criterion that determines whether the observed spin correlations require entanglement at emission. As an application, we consider a pair of identical $\Lambda$ hyperons, for which quantum statistics and final-state interactions affect the singlet and triplet spin channels differently at low relative momentum. Our results provide a framework for using experimentally accessible spin correlations to investigate entanglement at emission.

arXiv:2610.14358 [nucl-th]

(or arXiv:2610.14358v1 [nucl-th] for this version)

https://doi.org/10.48550/arXiv.2610.14358 Focus to learn more arXiv-issued DOI via DataCite (pending registration)

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