TY - JOUR

T1 - Search for η1(1855) in XcJ → decays

AU - BESIII Collaboration

AU - Ачасов, Михаил Николаевич

AU - Мучной, Николай Юрьевич

AU - Николаев, Иван Борисович

N1 - Search for η 1 (1855) in χ cJ → ηηη ′ decays* / M. Ablikim, M. N. Achasov, P. Adlarson [et al.] // Chinese Physics C. – 2025. – Vol. 49. - No. 12. – P. 123001. – DOI 10.1088/1674-1137/addfcc. – EDN CAVTQY. Supported in part by National Key R&D Program of China (2023YFA1606000, 2023YFA1606704); National Natural Science Foundation of China (NSFC) (11635010, 11935015, 11935016, 11935018, 12025502, 12035009, 12035013, 12061131003, 12192260, 12192261, 12192262, 12192263, 12192264, 12192265, 12221005, 12225509, 12235017, 12361141819); the Chinese Academy of Sciences (CAS) Large-Scale Scientific Facility Program; CAS (YSBR-101); 100 Talents Program of CAS; The Institute of Nuclear and Particle Physics (INPAC) and Shanghai Key Laboratory for Particle Physics and Cosmology; Agencia Nacional de Investigación y Desarrollo de Chile (ANID), Chile (ANID PIA/APOYO AFB230003); German Research Foundation DFG (FOR5327); Istituto Nazionale di Fisica Nucleare, Italy; Knut and Alice Wallenberg Foundation (2021.0174, 2021.0299); Ministry of Development of Turkey (DPT2006K-120470); National Research Foundation of Korea ( NRF-2022R1A2C1092335); National Science and Technology fund of Mongolia; National Science Research and Innovation Fund (NSRF) via the Program Management Unit for Human Resources Institutional Development, Research and Innovation of Thailand ( B50G670107); Polish National Science Centre (2024/53/B/ST2/00975); Swedish Research Council (2019.04595); U. S. Department of Energy (DE-FG02-05ER41374)

PY - 2025/12/1

Y1 - 2025/12/1

N2 - Based on a sample of events collected by the BESIII detector operating at the BEPCII collider, the decay is analyzed. The decay modes and are observed for the first time, and their corresponding branching fractions are determined to be and . An upper limit on the branching fraction of is set as at a 90% confidence level (CL). A partial wave analysis (PWA) of the decay is performed to search for the exotic state . The PWA result indicates that the structure in the mass spectrum is attributed to , while in the mass spectrum, it is attributed to the phase space. The upper limit of is set based on the PWA at 90% CL.

AB - Based on a sample of events collected by the BESIII detector operating at the BEPCII collider, the decay is analyzed. The decay modes and are observed for the first time, and their corresponding branching fractions are determined to be and . An upper limit on the branching fraction of is set as at a 90% confidence level (CL). A partial wave analysis (PWA) of the decay is performed to search for the exotic state . The PWA result indicates that the structure in the mass spectrum is attributed to , while in the mass spectrum, it is attributed to the phase space. The upper limit of is set based on the PWA at 90% CL.

UR - https://www.scopus.com/pages/publications/105029029385

UR - https://elibrary.ru/item.asp?id=86681060

U2 - 10.1088/1674-1137/addfcc

DO - 10.1088/1674-1137/addfcc

M3 - Article

VL - 49

JO - Chinese Physics C

JF - Chinese Physics C

SN - 1674-1137

IS - 12

M1 - 123001

ER -