Year: 2023
Type: article
Abstract: The quantum entangled J/ψ→Σ^{+}Σ[over ¯]^{-} pairs from (1.0087±0.0044)×10^{10} J/ψ events taken by the BESIII detector are used to study the nonleptonic two-body weak decays Σ^{+}→nπ^{+} and Σ[over ¯]^{-}→n[over ¯]π^{-}. The CP-odd weak decay parameters of the decays Σ^{+}→nπ^{+} (α_{+}) and Σ[over ¯]^{-}→n[over ¯]π^{-} (α[over ¯]_{-}) are determined to be 0.0481±0.0031_{stat}±0.0019_{syst} and -0.0565±0.0047_{stat}±0.0022_{syst}, respectively. The decay parameter α[over ¯]_{-} is measured for the first time, and the accuracy of α_{+} is improved by a factor of 4 compared to the previous results. The simultaneously determined decay parameters allow the first precision CP symmetry test for any hyperon decay with a neutron in the final state with the measurement of A_{CP}=(α_{+}+α[over ¯]_{-})/(α_{+}-α[over ¯]_{-})=-0.080±0.052_{stat}±0.028_{syst}. Assuming CP conservation, the average decay parameter is determined as ⟨α_{+}⟩=(α_{+}-α[over ¯]_{-})/2=-0.0506±0.0026_{stat}±0.0019_{syst}, while the ratios α_{+}/α_{0} and α[over ¯]_{-}/α[over ¯]_{0} are -0.0490±0.0032_{stat}±0.0021_{syst} and -0.0571±0.0053_{stat}±0.0032_{syst}, where α_{0} and α[over ¯]_{0} are the decay parameters of the decays Σ^{+}→pπ^{0} and Σ[over ¯]^{-}→p[over ¯]π^{0}, respectively.
Source: PubMed
Authors: BESIII Collaboration, Ablikim, M., Achasov, M. N., Adlarson, P., Ai, X. C., Aliberti, R., Amoroso, A., An, M. R., An, Q., Bai, Y., Bakina, O., Balossino, I., Ban, Y., Batozskaya, V., Begzsuren, K., Berger, N., Berlowski, M., Bertani, M., Bettoni, D., Bianchi, F., Bianco, E., Bloms, J., 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., Chang, T. T., Chang, W. L., Che, G. R., Chelkov, G., Chen, C., Chen, Chao, Chen, G., Chen, H. S., Chen, M. L., Chen, S. J., Chen, S. M., Chen, T., Chen, X. R., Chen, X. T., Chen, Y. B., Chen, Y. Q., Chen, Z. J., Cheng, W. S., Choi, S. K., Chu, X., Cibinetto, G., Coen, S. C., Cossio, F., Cui, J. J., Dai, H. L., Dai, J. P., Dbeyssi, A., de Boer, R. E., Dedovich, D., Deng, Z. Y., Denig, A., Denysenko, I., Destefanis, M., De Mori, F., Ding, B., Ding, X. X., Ding, Y., Ding, Y., Dong, J., Dong, L. Y., Dong, M. Y., Dong, X., Du, S. X., Duan, Z. 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Institutions: Institute of High Energy Physics, Siberian Branch of the Russian Academy of Sciences, Budker Institute of Nuclear Physics, Uppsala University, Zhengzhou University, Johannes Gutenberg University Mainz, Istituto Nazionale di Fisica Nucleare, Sezione di Torino, University of Turin, Liaoning Normal University, University of Science and Technology of China, Southeast University, Joint Institute for Nuclear Research, Istituto Nazionale di Fisica Nucleare, Sezione di Ferrara, Peking University, National Centre for Nuclear Research, Institute of Physics and Technology, Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati, University of Münster, Carnegie Mellon University, Wuhan University, Chinese Academy of Sciences, University of Chinese Academy of Sciences, Istinye University, Xinyang Normal University, Nankai University, Soochow University, Nanjing University, Tsinghua University, Institute of Modern Physics, Jilin University, Hunan University, Chung-Ang University, Ruhr University Bochum, Shandong University, Yunnan University, Helmholtz Institute Mainz, University of Jinan, Liaoning University, Università degli Studi del Piemonte Orientale “Amedeo Avogadro”, Sun Yat-sen University, University of Oxford, University of Ferrara, University of Manchester, GSI Helmholtz Centre for Heavy Ion Research, Guangxi University, Henan University of Technology, Nanjing Normal University, Shandong Normal University, Fudan University, Henan Normal University, University of Hawaiʻi at Mānoa, University of Hawaii System, Suranaree University of Technology, South China Normal University, University of the Punjab, Indiana University Bloomington, Indiana University, Hangzhou Normal University, Huangshan University, University of Tarapacá, University of Groningen, China University of Geosciences, Justus-Liebig-Universität Gießen, Indian Institute of Technology Madras, Qufu Normal University, Beijing Institute of Petrochemical Technology, Lanzhou University, Sichuan University, Guangxi Normal University, Shanxi University, Central China Normal University, Henan University of Science and Technology, University of South China, Central South University, Zhejiang University, Istituto Nazionale di Fisica Nucleare, Sezione di Perugia, COMSATS University Islamabad, University of Perugia, Hunan Normal University, Shanxi Normal University, Near East University, North China Electric Power University, Hebei University, University of Science and Technology Liaoning, Inner Mongolia University, Yantai University, Shanghai Jiao Tong University, China Center of Advanced Science and Technology, Beihang University, Henan University
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Funders: U.S. Department of Energy, Strong, European Commission, National Research Foundation, Deutsche Forschungsgemeinschaft, National Natural Science Foundation of China, Chinese Academy of Sciences, National Research Foundation of Korea, Vetenskapsrådet, Istituto Nazionale di Fisica Nucleare, CAS Center for Excellence in Particle Physics, Shanghai Key Laboratory for Particle Physics and Cosmology, Institute of High Energy Physics, H2020 European Research Council
Awards: G1612394202, G1652990914, G1857410302, G1907155555, G1985211653, BESIII上正反超子对关联产生及其衰变的实验研究, G2084762544, G222768804, G2628562399, G2777307501, G2986027706, G3150670375, G3234280719, BESIII上胶球的寻找和轻介子谱的研究, G3534486373, G3790219004, G3800312211, G434337789, G4799279977, G4883783264, BESIII实验类粲偶素的寻找和研究, The search for new physics through precision measurements of the CKM angle gamma, UNDERSTANDING QCD IN THE LIGHT MESON SECTOR (WITH EMPHASIS ON MAPPING GLUONIC EXCITATIONS)..., G5926705778, Hochpräzisionsmessung des PionFormfaktors bei BESIII eine Verbesserung der hadronischen VakuumpolarisationsKorrektur zu (g2) des Myons, G6040273958, G6119985531, 北京谱仪III上Ds衰变的实验研究, G6371861488, 北京正负电子对撞机BESIII实验上粲重子Λc研究, G6746531785, G6845169765, G6927153966, Search for the scalar glueball in a coupled channel amplitude analysis of J/psi decays with the BESIII experiment, 北京谱仪III上奇异介子和奇异夸克偶素的实验研究, G783835211, G8158558910, G8396383697, G868043634, Suche nach seltsamen VierQuarkZuständen im CharmoniumSektor an BESIII, G8756921898, UNDERSTANDING QCD IN THE LIGHT MESON SECTOR (WITH EXPHASIS ON MAPPING GLUONIC EXCITATIONS) USING PION AND PHOTON PROBES, G8776819963, G8944097419, G904559116, G945438540, G965723986, G983105509
OpenAlex ID: W4367627490