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 journalArticle

    Abstract

    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
    Volume1
    Issue number7
    DOIs
    StatePublished - 1970

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    mesons
    decay
    rays
    spark chambers
    products
    confidence
    counters
    neutrons
    estimates
    geometry

    ASJC Scopus subject areas

    • Physics and Astronomy (miscellaneous)

    Cite this

    Devons, S., Grunhaus, J., Kozlowski, T., Nemethy, P., Shapiro, S., Horwitz, N., ... Uto, H. (1970). Neutral decay modes of the η0 meson. Physical Review D, 1(7), 1936-1945. https://doi.org/10.1103/PhysRevD.1.1936

    Neutral decay modes of the η0 meson. / Devons, S.; Grunhaus, J.; Kozlowski, T.; Nemethy, P.; Shapiro, S.; Horwitz, N.; Kalogeropoulos, T.; Skelly, J.; Smith, R.; Uto, H.

    In: Physical Review D, Vol. 1, No. 7, 1970, p. 1936-1945.

    Research output: Contribution to journalArticle

    Devons, S, Grunhaus, J, Kozlowski, T, Nemethy, P, Shapiro, S, Horwitz, N, Kalogeropoulos, T, Skelly, J, Smith, R & Uto, H 1970, 'Neutral decay modes of the η0 meson', Physical Review D, vol. 1, no. 7, pp. 1936-1945. https://doi.org/10.1103/PhysRevD.1.1936
    Devons S, Grunhaus J, Kozlowski T, Nemethy P, Shapiro S, Horwitz N et al. Neutral decay modes of the η0 meson. Physical Review D. 1970;1(7):1936-1945. https://doi.org/10.1103/PhysRevD.1.1936
    Devons, S. ; Grunhaus, J. ; Kozlowski, T. ; Nemethy, P. ; Shapiro, S. ; Horwitz, N. ; Kalogeropoulos, T. ; Skelly, J. ; Smith, R. ; Uto, H. / Neutral decay modes of the η0 meson. In: Physical Review D. 1970 ; Vol. 1, No. 7. pp. 1936-1945.
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    AU - Devons, S.

    AU - Grunhaus, J.

    AU - Kozlowski, T.

    AU - Nemethy, P.

    AU - Shapiro, S.

    AU - Horwitz, N.

    AU - Kalogeropoulos, T.

    AU - Skelly, J.

    AU - Smith, R.

    AU - Uto, H.

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    N2 - 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.

    AB - 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.

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