Test of local realism via entangled $\Lambda\bar\Lambda$ system
High Energy Physics - Experiment
2025-07-02 v1
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 events collected with the BES-III detector at the BEPCII collider, performing non-local correlation tests using the entangled hyperon pairs. The massive-entangled systems are formed and decay through strong and weak interactions, respectively. Through measurements of the angular distribution of in and subsequent cascade decays, a significant violation of LHVT predictions is observed. The exclusion of LHVT is found to be statistically significant at a level exceeding in the testing of three Bell-like inequalities.
Cite
@article{arxiv.2505.14988,
title = {Test of local realism via entangled $\Lambda\bar\Lambda$ system},
author = {BESIII Collaboration and M. Ablikim and M. N. Achasov and P. Adlarson and X. C. Ai and R. Aliberti and A. Amoroso and M. R. An and Q. An and Y. Bai and O. Bakina and I. Balossino and Y. Ban and V. Batozskaya and K. Begzsuren and N. Berger and M. Berlowski and M. Bertani and D. Bettoni and F. Bianchi and E. Bianco and A. Bortone and I. Boyko and R. A. Briere and A. Brueggemann and H. Cai and X. Cai and A. Calcaterra and G. F. Cao and N. Cao and S. A. Cetin and J. F. Chang and T. T. Chang and W. L. Chang and G. R. Che and G. Chelkov and C. Chen and Chao Chen and G. Chen and H. S. Chen and M. L. Chen and S. J. Chen and S. M. Chen and T. Chen and X. R. Chen and X. T. Chen and Y. B. Chen and Y. Q. Chen and Z. J. Chen and W. S. Cheng and S. K. Choi and X. Chu and G. Cibinetto and S. C. Coen and F. Cossio and J. J. Cui and H. L. Dai and J. P. Dai and A. Dbeyssi and R. E. de Boer and D. Dedovich and Z. Y. Deng and A. Denig and I. Denysenko and M. Destefanis and F. DeMori and B. Ding and X. X. Ding and Y. Ding and Y. Ding and J. Dong and L. Y. Dong and M. Y. Dong and X. Dong and M. C. Du and S. X. Du and Z. H. Duan and P. Egorov and Y. L. Fan and J. Fang and S. S. Fang and W. X. Fang and Y. Fang and R. Farinelli and L. Fava and F. Feldbauer and G. Felici and C. Q. Feng and J. H. Feng and K. Fischer and M. Fritsch and C. Fritzsch and C. D. Fu and J. L. Fu and Y. W. Fu and H. Gao and Y. N. Gao and YangGao and S. Garbolino and I. Garzia and P. T. Ge and Z. W. Ge and C. Geng and E. M. Gersabeck and AGilman and K. Goetzen and L. Gong and W. X. Gong and W. Gradl and S. Gramigna and M. Greco and M. H. Gu and C. YGuan and Z. L. Guan and A. Q. Guo and L. B. Guo and M. J. Guo and R. P. Guo and Y. P. Guo and A. Guskov and T. T. Han and W. Y. Han and X. Q. Hao and F. A. Harris and K. K. He and K. L. He and F. HH. . Heinsius and C. H. Heinz and Y. K. Heng and C. Herold and T. Holtmann and P. C. Hong and G. Y. Hou and X. T. Hou and Y. R. Hou and Z. L. Hou and H. M. 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journal= {arXiv preprint arXiv:2505.14988},
year = {2025}
}