Neutral decay modes of the η0 meson

S. Devons, J. Grunhaus, T. Kozlowski, P. Nemethy, S. Shapiro, N. Horwitz, T. Kalogeropoulos, J. Skelly, R. Smith, H. Uto

    Research output: Contribution to journalArticlepeer-review


    The branching ratios of the decay of the η0 meson into neutral products have been measured. The η0 is produced in the reaction π-p→η0+n, and the decay products are observed as γ rays by a system of optical spark chambers and counters in nearly 4π geometry. Emphasis was placed on examining evidence for the decay mode η0→π0γγ (→4γ). Measurement of the neutron time of flight in the production process, together with detailed measurement and kinematical analysis of the pictures showing four γ rays, enables us to test each event for consistency with such a decay mode, and also for the "background" process π-+p→2π0+n. From what is essentially a comparison of the observed rates for these processes, we obtain the upper limit for (η0→π0γγ)(η0→all neutrals) ≤7% (90% confidence level), a result which is relatively insensitive to estimates of the efficiency of the detecting system. We also obtain (η0→3π0)(η0→2γ)=0.75±0.09.

    Original languageEnglish (US)
    Pages (from-to)1936-1945
    Number of pages10
    JournalPhysical Review D
    Issue number7
    StatePublished - 1970

    ASJC Scopus subject areas

    • Nuclear and High Energy Physics


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