| Title: |
Observation of transverse polarization and determination of psionic form factors of the Λ hyperon at s = 3.773 GeV |
| Authors: |
Ablikim, M.; Achasov, M. N.; Adlarson, P.; Ai, X. C.; Aliberti, R.; Amoroso, A.; An, Q.; Bai, Y.; Bakina, O.; 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, M. H.; Cai, X.; Calcaterra, A.; Cao, G. F.; Cao, N.; Cetin, S. A.; Chai, X. Y.; Chang, J. F.; Che, G. R.; Che, Y. Z.; 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, X. Y.; Chen, Y. B.; Chen, Y. Q. |
| Contributors: |
Fundamental Research Funds for the Central Universities; National Key Research and Development Program of China; National Natural Science Foundation of China; Natural Science Foundation of Gansu Province; Overseas Expertise Introduction Center for Discipline Innovation of Food Nutrition and Human Health; Chinese Academy of Sciences; Institute of Nuclear and Particle Physics, Shanghai Jiao Tong University; Shanghai Key Laboratory for Particle Physics and Cosmology; Deutsche Forschungsgemeinschaft; Istituto Nazionale di Fisica Nucleare Sezione di Padova; Knut och Alice Wallenbergs Stiftelse; Kalkinma Bakanli?i; National Research Foundation of Korea; Mongolian Foundation for Science and Technology; Narodowe Centrum Nauki; Vetenskapsrådet; U.S. Department of Energy; Guangdong Provincial Key Laboratory of Advanced Particle Detection Technology; Guangdong Provincial Key Laboratory of Gamma-Gamma Collider; National Science Research and Innovation Fund; Program Management Unit for Human Resources and Institutional Development, Research and Innovation of Thailand |
| Source: |
Physical Review D ; volume 112, issue 5 ; ISSN 2470-0010 2470-0029 |
| Publisher Information: |
American Physical Society (APS) |
| Publication Year: |
2025 |
| Description: |
Using a data sample of collision data corresponding to an integrated luminosity of collected by the BESIII detector at the BEPCII collider, we present an observation of transverse polarization and a complete determination of the psionic form factors of the hyperon in decay with the entangled pair at . The relative phase between the psionic form factors is determined to be with a significance of 5.5 σ taking into account systematic uncertainty. This result indicates a nonzero phase between the transition amplitudes of the ΛΛ¯ helicity states. Additionally, we measure the angular distribution parameter and the modulus of the ratio between the psionic form factors to be η=0.86±0.05±0.03 and R(s)=|GE(s |
| Document Type: |
article in journal/newspaper |
| Language: |
English |
| DOI: |
10.1103/qqw4-wnnt |
| DOI: |
10.1103/qqw4-wnnt/fulltext |
| Availability: |
https://doi.org/10.1103/qqw4-wnnt; https://link.aps.org/article/10.1103/qqw4-wnnt; http://harvest.aps.org/v2/journals/articles/10.1103/qqw4-wnnt/fulltext |
| Rights: |
https://creativecommons.org/licenses/by/4.0/ |
| Accession Number: |
edsbas.820ED673 |
| Database: |
BASE |