A study of the ηη′ and η′η′ channels produced in central pp interactions at 450 GeV/c

• Published in: Physics letters. B Vol. 471; no. 4; pp. 429 - 434
• Main Authors: Barberis, D, Binon, F.G, Close, F.E, Danielsen, K.M, Donskov, S.V, Earl, B.C, Evans, D, French, B.R, Hino, T, Inaba, S, Jacholkowski, A, Jacobsen, T, Khaustov, G.V, Kinson, J.B, Kirk, A, Kondashov, A.A, Lednev, A.A, Lenti, V, Minashvili, I, Peigneux, J.P, Romanovsky, V, Russakovich, N, Semenov, A, Shagin, P.M, Shimizu, H, Singovsky, A.V, Sobol, A, Stassinaki, M, Stroot, J.P, Takamatsu, K, Tsuru, T, Villalobos Baillie, O, Votruba, M.F, Yasu, Y
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 2000
• ISSN: 0370-2693; 1873-2445
• DOI: 10.1016/S0370-2693(99)01392-1

The reactions pp→ p f ( X 0) p s , where X 0 is observed decaying to ηη ′ and η ′ η ′, have been studied at 450 GeV/c. This is the first time that these channels have been observed in central production and only the second time that the η ′ η ′ channel has been observed in any production mechanism. In the ηη ′ channel there is evidence for the f 0(1500) and a peak at 1.95 GeV. The η ′ η ′ channel shows a peak at threshold which is compatible with having J PC =2 ++ and spin projection J Z =0.