Ablikim, M.Achasov, M. N.Ai, X. C.Albayrak, O.Albrecht, M.Ambrose, D. J.Amoroso, A.Lou, XinchouBESII Collaboration2016-07-012016-07-012015-112015-110031-9007http://hdl.handle.net/10735.1/4858Includes supplementary material.A neutral structure in the DD̅* system around the DD̅* mass threshold is observed with a statistical significance greater than 10σ in the processes e⁺e⁻ → D⁺D*π° + c.c. and e⁺e⁻ →D°D̅*⁰ + c.c. At √s = 4.226 and 4.257 GeV in the BESIII experiment. The structure is denoted as Z_c(3885)⁰. Assuming the presence of a resonance, its pole mass and width are determined to be [3885.7_{-5.7}^{+4.3} (stat) ± 8.4(syst)] MeV/c² and [35_{-12}^{+11} (stat) ± 15(syst)] MeV, respectively. The Born cross sections are measured to be σ[e⁺e⁻ → Z_c(3885)°π°, Z_c(3885)° →DD̅*] = [77 ± 13(stat) ± 17(syst)] pb at 4.226 GeV and [47 ± 9(stat) ± 10(syst)] pb at 4.257 GeV. The ratio of decay rates B[Z_c(3885)° → D⁺D*⁻ + c.c.] / 𝓑ℬ[Z_c(3885)° → D°D̅*° + c.c.] is determined to be 0.96 ± 0.18(stat) ± 0.12(syst), consistent with no isospin violation in the process, Z_c(3885)° → DD̅*.en©2015 American Physical SocietyUncertaintyAtomic massZc(3885)Isobaric spinarticleAblikim, M., M. N. Achasov, X. C. Ai, O. Albayrak, et al. 2015. "Observation of a Neutral Structure Near the DD̅* Mass Threshold in e⁺e⁻ → (DD̅*)⁰π⁰ at √s= 4.226 and 4.257 GeV." Physical Review Letters 115(22), doi:10.1103/PhysRevLett.115.222002.11522