Measurement of neutral- and charged-pion form-factor slopes

S. Devons, P. Némethy, C. Nissim-Sabat, E. Di Capua, A. Lanzara

    Research output: Contribution to journalArticlepeer-review


    In an experiment performed at Columbia University's Nevis cyclotron, we studied the reactions (1) π0→γ+e++e- and (2) π-+p→n+e++e- for π- at rest. Using a system of counters and spark chambers, we selected pairs with an opening angle near 120°. We analyzed the invariant-mass spectrum of the pairs (1) in 2200 π0 decays and (2) in 400 radiative captures. For the π0 form-factor slope, we find a=(+0.01±0.11)mπ02. We obtain the charged-pion form-factor slope for time like momentum transfers of the order of mπ. Our result for the pion charge radius is rπ<1.9 F with a 90% confidence level.

    Original languageEnglish (US)
    Pages (from-to)1356-1362
    Number of pages7
    JournalPhysical Review
    Issue number5
    StatePublished - 1969

    ASJC Scopus subject areas

    • General Physics and Astronomy


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