BWhat changed
The BESIII Collaboration measured proton–antiproton angular correlations in J/psi radiative decays producing Lambda–anti-Lambda pairs. An amplitude analysis separated spin-singlet contributions from backgrounds, and the corrected angular distribution agreed with the singlet-state model. Selected decay geometries supported a Bell-like comparison for massive particles; the authors reported a 5.2-sigma Clauser–Horne-type comparison under their reconstruction and statistical assumptions.
Scientific scope
The BESIII Collaboration measured proton–antiproton angular correlations in J/psi radiative decays producing Lambda–anti-Lambda pairs. An amplitude analysis separated spin-singlet contributions from backgrounds, and the corrected angular distribution agreed with the singlet-state model. Selected decay geometries supported a Bell-like comparison for massive particles; the authors reported a 5.2-sigma Clauser–Horne-type comparison under their reconstruction and statistical assumptions. The decay directions are passive spin analyzers. Detection and freedom-of-choice loopholes remain open, and the reconstructed comparison uses amplitude modeling, background subtraction, acceptance corrections and normalization. The supplementary CHSH significance comes from model-generated pseudoexperiments. Numerical and notation discrepancies in the reported significance conversion and selection uncertainties require clarification. The angular-correlation inference depends on modelling and does not close all loopholes or exclude all local hidden-variable models.
Evidence
The linked original works support the scoped statement and contribution attribution. WRS has not independently replayed experiments or reconstructed a full mathematical proof. The decay directions are passive spin analyzers. Detection and freedom-of-choice loopholes remain open, and the reconstructed comparison uses amplitude modeling, background subtraction, acceptance corrections and normalization. The supplementary CHSH significance comes from model-generated pseudoexperiments. Numerical and notation discrepancies in the reported significance conversion and selection uncertainties require clarification. The angular-correlation inference depends on modelling and does not close all loopholes or exclude all local hidden-variable models.
Contributors
- The named authors in the research record · SCIENCE: These are the listed authors of the cited contribution sources. Paper authorship does not quantify individual effort. An incomplete list is explicitly marked; same names are not automatically merged.
- Test of local realism via entangled Lambda–anti-Lambda system (Nature Communications16:4948)
- Supplementary Information: Test of local realism via entangled Lambda–anti-Lambda system
Provisional WRS assessment, edition 2026-10-28.1. Independent expert calibration is pending. This grade does not certify correctness or assign ownership.
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