DOE OSTI · 2543146
Search for Λ − Λ ¯ oscillation in J / ψ → Λ Λ ¯ decay
Abstract
Using ( 10087 ± 44 ) × 10 6 J / ψ decays collected by the BESIII detector at the BEPCII collider, we search for baryon number violation via Λ − Λ ¯ oscillation in the decay J / ψ → Λ Λ ¯ . No evidence for Λ − Λ ¯ oscillation is observed. The upper limit on the time-integrated probability of Λ − Λ ¯ oscillation is estimated to be 1.4 × 10 − 6 , corresponding to an oscillation parameter less than 2.1 × 10 − 18 GeV at 90% confidence level. Published by the American Physical Society 2025
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Ablikim, M., Achasov, M. N., Adlarson, P., Afedulidis, O., Ai, X. C., Aliberti, R., Amoroso, A., An, Q., Bai, Y., Bakina, O., Balossino, I., Ban, Y., Bao, H. -R., Batozskaya, V., Begzsuren, K., Berger, N., Berlowski, M., Bertani, M., Bettoni, D., Bianchi, F., Bianco, E., Bortone, A., Boyko, I., Briere, R. A., Brueggemann, A., Cai, H., Cai, X., Calcaterra, A., Cao, G. F., Cao, N., Cetin, S. A., Chang, J. F., Che, G. R., Chelkov, G., Chen, C., Chen, C. H., Chen, Chao, Chen, G., Chen, H. S., Chen, H. Y., Chen, M. L., Chen, S. J., Chen, S. L., Chen, S. M., Chen, T., Chen, X. R., Chen, X. T., Chen, Y. B., Chen, Y. Q., Chen, Z. J., Chen, Z. Y., Choi, S. K., Cibinetto, G., Cossio, F., Cui, J. J., Dai, H. L., Dai, J. P., Dbeyssi, A., de Boer, R. E., Dedovich, D., Deng, C. Q., Deng, Z. Y., Denig, A., Denysenko, I., Destefanis, M., De Mori, F., Ding, B., Ding, X. X., Ding, Y., Dong, J., Dong, L. Y., Dong, M. Y., Dong, X., Du, M. C., Du, S. X., Duan, Y. Y., Duan, Z. H., Egorov, P., Fan, Y. H., Fang, J., Fang, S. S., Fang, W. X., Fang, Y., Fang, Y. Q., Farinelli, R., Fava, L., Feldbauer, F., Felici, G., Feng, C. Q., Feng, J. H., Feng, Y. T., Fritsch, M., Fu, C. D., Fu, J. L., Fu, Y. W., Gao, H., Gao, X. B., Gao, Y. N., Gao, Yang, Garbolino, S.. 2025-03-31. Search for Λ − Λ ¯ oscillation in J / ψ → Λ Λ ¯ decay. https://doi.org/10.1103/physrevd.111.052014
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