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

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

doi:10.1103/PhysRev.184.1356

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

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

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Abstract

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 language	English (US)
Pages (from-to)	1356-1362
Number of pages	7
Journal	Physical Review
Volume	184
Issue number	5
DOIs	https://doi.org/10.1103/PhysRev.184.1356
State	Published - 1969

ASJC Scopus subject areas

General Physics and Astronomy

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10.1103/PhysRev.184.1356

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title = "Measurement of neutral- and charged-pion form-factor slopes",

abstract = "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.",

author = "S. Devons and P. N{\'e}methy and C. Nissim-Sabat and {Di Capua}, E. and A. Lanzara",

year = "1969",

doi = "10.1103/PhysRev.184.1356",

language = "English (US)",

volume = "184",

pages = "1356--1362",

journal = "Physical Review",

issn = "0031-899X",

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TY - JOUR

T1 - Measurement of neutral- and charged-pion form-factor slopes

AU - Devons, S.

AU - Némethy, P.

AU - Nissim-Sabat, C.

AU - Di Capua, E.

AU - Lanzara, A.

PY - 1969

Y1 - 1969

N2 - 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.

AB - 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.

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JO - Physical Review

JF - Physical Review

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

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