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 journalArticle


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
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Fingerprint Dive into the research topics of 'Measurement of neutral- and charged-pion form-factor slopes'. Together they form a unique fingerprint.

  • Cite this

    Devons, S., Némethy, P., Nissim-Sabat, C., Di Capua, E., & Lanzara, A. (1969). Measurement of neutral- and charged-pion form-factor slopes. Physical Review, 184(5), 1356-1362.