Test of local realism via entangled <math xmlns="http://www.w3.org/1998/Math/MathML"><mi>Λ</mi> <mover><mrow><mi>Λ</mi></mrow> <mo>¯</mo></mover> </math> system.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 40436867.
- Also identified by DOI 10.1038/s41467-025-59498-4 and PMC identifier 12119992.
- No licence information is recorded for this record.
- Because redistribution is not established, this page shows the abstract only. Follow the links below for the full text.
Abstract
The non-locality of quantum correlations is a fundamental feature of quantum theory. The Bell inequality serves as a benchmark for distinguishing between predictions made by quantum theory and local hidden variable theory (LHVT). Recent advancements in photon-entanglement experiments have addressed potential loopholes and have observed significant violations of variants of Bell inequality. However, examples of Bell inequalities violation in high energy physics are scarce. In this study, we utilize (10.087 ± 0.044) × 10<sup>9</sup> J/ψ events collected with the BES-III detector at the BEPCII collider, performing non-local correlation tests using the entangled hyperon pairs. The massive-entangled <math xmlns="http://www.w3.org/1998/Math/MathML"><mi>Λ</mi> <mover><mrow><mi>Λ</mi></mrow> <mo>¯</mo></mover> </math> systems are formed and decay through strong and weak interactions, respectively. Through measurements of the angular distribution of <math xmlns="http://www.w3.org/1998/Math/MathML"><mi>p</mi> <mover><mrow><mi>p</mi></mrow> <mo>¯</mo></mover> </math> in J/ψ → γη<sub>c</sub> and subsequent <math xmlns="http://www.w3.org/1998/Math/MathML"> <msub><mrow><mi>η</mi></mrow> <mrow><mi>c</mi></mrow> </msub> <mo>→</mo> <mi>Λ</mi> <mrow><mo>(</mo> <mrow><mi>p</mi> <msup><mrow><mi>π</mi></mrow> <mrow><mo>-</mo></mrow> </msup> </mrow> <mo>)</mo></mrow> <mover><mrow><mi>Λ</mi></mrow> <mo>¯</mo></mover> <mrow><mo>(</mo> <mrow> <mover><mrow><mi>p</mi></mrow> <mo>¯</mo></mover> <msup><mrow><mi>π</mi></mrow> <mrow><mo>+</mo></mrow> </msup> </mrow> <mo>)</mo></mrow> </math> cascade decays, a significant violation of LHVT predictions is observed. The exclusion of LHVT is found to be statistically significant at a level exceeding 5.2σ in the testing of three Bell-like inequalities.