Measurement of the neutral-pion form factor by means of the reaction. pi. /sup 0/. -->. e/sup +/e. sqrt gamma
Thesis/Dissertation
·
OSTI ID:5947344
The slope parameter a of the ..pi../sup 0/-electromagnetic transition form factor was obtained from a measurement of the partial branching ratio of the Dalitz decay ..pi../sup 0/ ..-->.. e/sup +/e/sup -/..gamma.. into high invariant-mass electron-positron pairs. The experiment was carried out at the TRIUMF cyclotron laboratory. A beam of ..pi../sup -/ mesons was stopped in a liquid hydrogen target to produce neutral pions in the reaction ..pi../sup -/ p ..-->.. n ..pi../sup 0/. The electron-positron pairs were detected with two delay-line chamber telescopes, each followed by a large Nal crystal. A third Cal crystal measured the number of ..pi../sup 0/'s in the target by counting the photons from the decay ..pi../sup 0/ ..cap alpha.. ..gamma.. ..gamma... Data was taken at three detector opening angles 60/sup 0/, 130/sup 0/ and 156/sup 0/. The 60/sup 0/ measurement confirms the authors normalization. A value a = - 0.01 +/- 0.035 + 0.07/-0.05, where the first error is due to statistics and the second is an estimate of systematic effects, was obtained from the 130/sup 0/ geometry. This value does not support the result of the most recent previous experiment and is in accord with most theoretical calculations indicating that there is no unexpected structure in the ..pi../sup 0/ decay form factor.
- Research Organization:
- Oregon State Univ., Corvallis (USA)
- OSTI ID:
- 5947344
- Country of Publication:
- United States
- Language:
- English
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Journal Article
·
Mon Dec 31 23:00:00 EST 1979
· Phys. Rev., D; (United States)
·
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Bremsstrahlung photons in the decay. pi. /sup 0/. -->. e/sup +/e/sup -/
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Fri May 01 00:00:00 EDT 1987
· Sov. J. Nucl. Phys. (Engl. Transl.); (United States)
·
OSTI ID:6084509
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Journal Article
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· Zhur. Eksptl'. i Teoret. Fiz.
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Related Subjects
645101* -- High Energy Physics-- Particle Interactions & Properties-Experimental-- Electromagnetic Interactions & Properties
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ACCELERATORS
ANTILEPTONS
ANTIMATTER
ANTIPARTICLES
BOSONS
CYCLIC ACCELERATORS
CYCLOTRONS
DATA
ELECTRONS
ELEMENTARY PARTICLES
EXPERIMENTAL DATA
FERMIONS
FORM FACTORS
HADRON-HADRON INTERACTIONS
HADRONS
INFORMATION
INTERACTIONS
ISOCHRONOUS CYCLOTRONS
LEPTONS
MASSLESS PARTICLES
MESON-BARYON INTERACTIONS
MESON-NUCLEON INTERACTIONS
MESONS
NUMERICAL DATA
PARTICLE INTERACTIONS
PARTICLE PROPERTIES
PHOTONS
PION MINUS-PROTON INTERACTIONS
PION-NUCLEON INTERACTIONS
PION-PROTON INTERACTIONS
PIONS
PIONS NEUTRAL
POSITRONS
PSEUDOSCALAR MESONS
RADIATIVE DECAY
TRIUMF CYCLOTRON
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ACCELERATORS
ANTILEPTONS
ANTIMATTER
ANTIPARTICLES
BOSONS
CYCLIC ACCELERATORS
CYCLOTRONS
DATA
ELECTRONS
ELEMENTARY PARTICLES
EXPERIMENTAL DATA
FERMIONS
FORM FACTORS
HADRON-HADRON INTERACTIONS
HADRONS
INFORMATION
INTERACTIONS
ISOCHRONOUS CYCLOTRONS
LEPTONS
MASSLESS PARTICLES
MESON-BARYON INTERACTIONS
MESON-NUCLEON INTERACTIONS
MESONS
NUMERICAL DATA
PARTICLE INTERACTIONS
PARTICLE PROPERTIES
PHOTONS
PION MINUS-PROTON INTERACTIONS
PION-NUCLEON INTERACTIONS
PION-PROTON INTERACTIONS
PIONS
PIONS NEUTRAL
POSITRONS
PSEUDOSCALAR MESONS
RADIATIVE DECAY
TRIUMF CYCLOTRON