Photon and neutral pion production in the upsilon region
Thesis/Dissertation
·
OSTI ID:6688787
Various properties of photon and neutral pion production from the Upsilon resonances and the nearby continuum i e/sup +/e/sup -/ annihilations are discussed. These measurements were made using the CLEO detector at the Cornell Electron Storage Ring. A measurement of the photon multiplicity and photon energy fraction of the continuum and the Upsilon(4S) is presented. Comparison with charged multiplicity measurements is made. Using the photon energy fraction measurement and previous measurements of the charged energy fraction, the amount of undetected energy is calculated and compared with expectations from conventional sources. A measurement of the neutral pion momentum spectrum of the continuum and Upsilon(1S) is presented. Comparison is made with the momentum spectrum of charged pions. Also, comparison of the single photon spectrum from neutral pion decay and the observed single photon spectrum is made. A measurement of the direct photon spectrum from Upsilon(1S) decay is also presented. These photons are interpreted as coming from the decay Upsilon(1S) ..-->.. photon + gluon + gluon. The shape of the observed photon energy spectrum is compared with several theoretical predictions. The value of the strong coupling constant, ..cap alpha../sub s/, and the energy scale parameter of quantum chromodynamics, ..lambda../sub MS/, associated with each prediction, is deduced.
- Research Organization:
- Cornell Univ., Ithaca, NY (USA)
- OSTI ID:
- 6688787
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
645101* -- High Energy Physics-- Particle Interactions & Properties-Experimental-- Electromagnetic Interactions & Properties
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BOSONS
CESR STORAGE RING
COUPLING CONSTANTS
DATA
ELECTRON-POSITRON INTERACTIONS
ELEMENTARY PARTICLES
ENERGY SPECTRA
EXPERIMENTAL DATA
FIELD THEORIES
HADRONS
INFORMATION
INTERACTIONS
LEPTON-LEPTON INTERACTIONS
LINEAR MOMENTUM
MASSLESS PARTICLES
MESONS
MULTIPLICITY
NUMERICAL DATA
PARTICLE INTERACTIONS
PARTICLE PRODUCTION
PHOTONS
PIONS
PIONS NEUTRAL
PSEUDOSCALAR MESONS
QUANTUM CHROMODYNAMICS
QUANTUM FIELD THEORY
SPECTRA
STORAGE RINGS
UPSILON RESONANCES
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BOSONS
CESR STORAGE RING
COUPLING CONSTANTS
DATA
ELECTRON-POSITRON INTERACTIONS
ELEMENTARY PARTICLES
ENERGY SPECTRA
EXPERIMENTAL DATA
FIELD THEORIES
HADRONS
INFORMATION
INTERACTIONS
LEPTON-LEPTON INTERACTIONS
LINEAR MOMENTUM
MASSLESS PARTICLES
MESONS
MULTIPLICITY
NUMERICAL DATA
PARTICLE INTERACTIONS
PARTICLE PRODUCTION
PHOTONS
PIONS
PIONS NEUTRAL
PSEUDOSCALAR MESONS
QUANTUM CHROMODYNAMICS
QUANTUM FIELD THEORY
SPECTRA
STORAGE RINGS
UPSILON RESONANCES