TY - JOUR
T1 - Test of local realism via entangled ΛΛ¯ system
AU - Zu, J.
AU - Zou, J. H.
AU - Zhu, Z. A.
AU - Zhu, Y. C.
AU - Kabana, S.
AU - The BESIII collaboration
N1 - Publisher Copyright:
© The Author(s) 2025.
PY - 2025/12
Y1 - 2025/12
N2 - 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) × 109 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 ΛΛ¯ systems are formed and decay through strong and weak interactions, respectively. Through measurements of the angular distribution of pp¯ in J/ψ → γηc and subsequent ηc→Λ(pπ−)Λ¯(p¯π+) 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.
AB - 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) × 109 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 ΛΛ¯ systems are formed and decay through strong and weak interactions, respectively. Through measurements of the angular distribution of pp¯ in J/ψ → γηc and subsequent ηc→Λ(pπ−)Λ¯(p¯π+) 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.
UR - https://www.scopus.com/pages/publications/105009269882
U2 - 10.1038/s41467-025-59498-4
DO - 10.1038/s41467-025-59498-4
M3 - Article
C2 - 40436867
AN - SCOPUS:105009269882
SN - 2041-1723
VL - 16
JO - Nature Communications
JF - Nature Communications
IS - 1
M1 - 4948
ER -