Observation of a pseudoscalar state in near threshold

Z. Bai, G. T. Blaylock, T. Bolton, T. E. Browder, J. S. Brown, K. O. Bunnell, T. H. Burnett, R. E. Cassell, D. Coffman, V. Cook, F. DeJongh, D. E. Dorfan, J. Drinkard, G. P. Dubois, G. Eigen, K. F. Einsweiler, B. I. Eisenstein, T. Freese, C. Gatto, G. GladdingJ. Hauser, C. A. Heusch, D. G. Hitlin, J. M. Izen, P. C. Kim, J. Labs, A. Li, W. S. Lockman, U. Mallik, C. G. Matthews, A. I. Mincer, R. Mir, P. M. Mockett, R. F. Mozley, B. Nemati, A. Odian, L. Parrish, R. Partridge, D. Pitman, S. A. Plaetzer, J. D. Richman, H. F.W. Sadrozinski, M. Scarlatella, T. L. Schalk, R. H. Schindler, A. Seiden, C. Simopoulos, I. E. Stockdale, W. Toki, B. Tripsas, F. Villa, M. Z. Wang, S. Wasserbaech, A. J. Weinstein, S. Weseler, H. J. Willutzki, D. Wisinski, W. J. Wisniewski, R. Xu, Y. Zhu

    Research output: Contribution to journalArticlepeer-review


    We present a study of the radiative decay in the K+K-K+K- and K+K-KS0KL0 final states. A pseudoscalar state is observed in the invariant-mass spectrum at 2.22 GeV/c2 with a width of 150 MeV/c2. The product branching ratios are BB10-4 for the K+K-K+K- mode and B0.6)×10-4 for the K+K-KS0KL0 mode. No evidence for 2++ states below 2.4 GeV/c2 is found in this radiative decay mode.

    Original languageEnglish (US)
    Pages (from-to)1309-1312
    Number of pages4
    JournalPhysical Review Letters
    Issue number11
    StatePublished - 1990

    ASJC Scopus subject areas

    • General Physics and Astronomy


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