@article{3052888,
    title = "A study of the eta eta ` and eta `eta ` channels produced in central pp
interactions at 450 GeV/c",
    author = "Barberis, D and Binon, FG and Close, FE and Danielsen, KM and Donskov, and SV and Earl, BC and Evans, D and French, BR and Hino, T and Inaba, S and and Jacholkowski, A and Jacobsen, T and Khaustov, GV and Kinson, JB and and Kirk, A and Kondashov, AA and Lednev, AA and Lenti, V and Minashvili, I and and Peigneux, JP and Romanovsky, V and Russakovich, N and Semenov, A and and Shagin, PM and Shimizu, H and Singovsky, AV and Sobol, A and Stassinaki, and M and Stroot, JP and Takamatsu, K and Tsuru, T and Baillie, OV and and Votruba, MF and Yasu, Y",
    journal = "PHYSICS LETTERS B",
    year = "2000",
    volume = "471",
    number = "4",
    pages = "429-434",
    publisher = "Elsevier",
    issn = "0370-2693",
    doi = "10.1016/S0370-2693(99)01392-1",
    abstract = "The reactions pp –> p(f)(X-0)p(s), where X-0 is observed decaying to
eta eta’ and eta’eta’, 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 eta’eta’ channel has been observed in any
production mechanism. In the eta eta’ channel there is evidence for the
f(0)(1500) and a peak at 1.95 GeV. The eta’eta’ channel shows a peak at
threshold which is compatible with having J(PC) = 2(++) and spin
projection J(Z) = 0. (C) 2000 Published by Elsevier Science B.V. All
rights reserved."
}