Ablikim, M.Achasov, M. N.Adlarson, PatrikAlbrecht, MalteÇetin, Serkant AliKolcu, Onur Buğra2023-01-262023-01-262022Ablikim, M., Achasov, M. N., Adlarson, P., Ahmed, S., Albrecht, M., Aliberti, R., Amoroso, A., An, M. R., An, Q., Bai, X. H., Bai, Y., Bakina, O., Ferroli, R. B., Balossino, I., Ban, Y., Batozskaya, V., Becker, D., Begzsuren, K., Berger, N., Bertani, M., … BESIII Collaboration (2022). Observation of an Isoscalar Resonance with Exotic J^{PC}=1^{-+} Quantum Numbers in J/ψ→γηη^{'}. Physical review letters, 129(19), 192002. https://doi.org/10.1103/PhysRevLett.129.192002http://dx.doi.org/10.1103/PhysRevLett.129.192002https://hdl.handle.net/20.500.12713/3839Using a sample of (10.09±0.04)×10^{9} J/? events collected with the BESIII detector operating at the BEPCII storage ring, a partial wave analysis of the decay J/?????^{'} is performed. The first observation of an isoscalar state with exotic quantum numbers J^{PC}=1^{-+}, denoted as ?_{1}(1855), is reported in the process J/????_{1}(1855) with ?_{1}(1855)???^{'}. Its mass and width are measured to be (1855±9_{-1}^{+6}) MeV/c^{2} and (188±18_{-8}^{+3}) MeV, respectively, where the first uncertainties are statistical and the second are systematic, and its statistical significance is estimated to be larger than 19?.eninfo:eu-repo/semantics/closedAccessArticle1291936399732WOS:001043962200009Q110.1103/PhysRevLett.129.192002