Ablikim, M.Achasov, M. N.Adlarson, P.Albrecht, M.Aliberti, R.Amoroso, A.Çetin, Serkant Ali2024-05-192024-05-1920222470-00102470-0029https://doi.org10.1103/PhysRevD.106.112007https://hdl.handle.net/20.500.12713/5789The decays J/psi -> eta Sigma(+)(Sigma) over bar (-) and psi(3686) -> eta Sigma(+)(Sigma) over bar (-) are observed for the first time, using (10087 +/- 44) x 10(6) J/psi and (448.1 +/- 2.9) x 10(6) psi(3686) events collected with the BESIII detector at the BEPCII collider. We determine the branching fractions of these two decays to be B(J/psi -> eta Sigma(+)(Sigma) over bar (-)) = (6.34 +/- 0.21 +/- 0.37) x 10(-5) and B(psi(3686) -> eta Sigma(+)(Sigma) over bar (-)) = ( 9.59 +/- 2.37 +/- 0.61) x 10(-6), where the first uncertainties are statistical and the second are systematic. The ratio of these two branching fractions is determined to be B(psi(3686) -> eta Sigma(+)(Sigma) over bar (-))/B(J/psi -> eta Sigma(+)(Sigma) over bar (-)) = (15.1 +/- 3.8)%, which is in agreement with the 12% rule.eninfo:eu-repo/semantics/openAccess[No Keywords]Article10611WOS:0009282475000012-s2.0-85144945418Q110.1103/PhysRevD.106.112007Q1