Using a sample of (10.09 +/- 0.04) x 10(9) J/Psi events collected with the BESIII detector, a partial wave analysis of J/Psi -> gamma eta'eta' is performed. The masses and widths of the observed resonances and their branching fractions are reported. The main contribution is from J/Psi -> gamma f(0) (2020) with f(0) (2020) -> eta'eta', which is found with a significance of greater than 25 sigma. The product branching fraction B(J/Psi -> gamma f(0) (2020)) -> eta'eta') is measured to be (2.63 +/- 0.06(stat.)(-0.46)(+0.31)(syst.)) x 10(-4).
Partial wave analysis of J/Psi -> gamma eta 'eta '
Amoroso, A;Bianchi, F;Bortone, A;Destefanis, M;De Mori, F;Fava, L;Greco, M;Hu, JF;Lavezzi, L;Maggiora, M;Marcello, S;Rivetti, A;Sosio, S;Spataro, S;Yan, L;
2022-01-01
Abstract
Using a sample of (10.09 +/- 0.04) x 10(9) J/Psi events collected with the BESIII detector, a partial wave analysis of J/Psi -> gamma eta'eta' is performed. The masses and widths of the observed resonances and their branching fractions are reported. The main contribution is from J/Psi -> gamma f(0) (2020) with f(0) (2020) -> eta'eta', which is found with a significance of greater than 25 sigma. The product branching fraction B(J/Psi -> gamma f(0) (2020)) -> eta'eta') is measured to be (2.63 +/- 0.06(stat.)(-0.46)(+0.31)(syst.)) x 10(-4).
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