Sigma. sub c production from e sup + e sup minus annihilation in the. Upsilon. energy region
This dissertation presents results of a study of {Sigma}{sub c} production in the {Upsilon} energy region. The experiment was performed at the Cornell Electron Storage Ring using the CLEO detector, the CLEO detector is a large-aperture magnetic detector. Previous experiments have presented inconsistent values for the mass difference M({Sigma}{sub c}{sup 0}) - M({Lambda}{sub c}{sup +}) differing by 10.8 MeV/c{sup 2}, while agreeing on the value for M({Sigma}{sub c}{sup ++}) - M({Lambda}{sub c}{sup +}). This analysis measures both of these mass differences. The author finds M({Sigma}{sub c}{sup ++}) - M({Lambda}{sub c}{sup +}) {equals} 167.8 {+-} 0.5 {+-} 0.3 MeV/c{sup 2}, which is consistent with the previous measurements; and M({Sigma}{sub c}{sup 0}) - M({Lambda}{sub c}{sup +}) {equals} 167.9 {+-} 0.5 {+-} 0.3 MeV/c{sup 2}, which is consistent with one of the previous measurements. The ratio of production cross section for {Sigma}{sub c} relative to {Lambda}{sub c}{sup +} is measured to be 0.18 {+-} 0.04 {+-} 0.06. The mass difference measurements provide test models of baryon spectroscopy and the ratio of {Sigma}{sub c} to {Lambda}{sub c}{sup +} production cross sections provides information on the ratio of spin 1 to spin 0 diquarks providing a test of models of baryon hadronization. Finally, the author has searched for {sigma}{sub c} production in B meson decay, where the author has used data taken on the {Upsilon}(4S) for our sample of B mesons. The author has found some evidence for the {Sigma}{sub c}{sup ++} in B decay, but the result of {Sigma}{sub c}{sup 0} analysis is inconclusive. The relative branching ratio of Br(B {yields}{Sigma}{sub c}{sup ++}X):Br(B {yields} {Lambda}{sub c}{sup +}Y) is measured to be 0.16 {+-} 0.08 {+-} 0.05 and Br(B {yields} {Sigma}{sub c}{sup 0}X):Br(B {yields} {Lambda}{sub c}{sup +}Y) {lt} 0.16 {at} the 90% confidence level.
- Research Organization:
- Vanderbilt Univ., Nashville, TN (United States)
- OSTI ID:
- 5466340
- Resource Relation:
- Other Information: Thesis (Ph. D.)
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
B MESONS
PARTICLE DECAY
ELECTRON-POSITRON INTERACTIONS
ANNIHILATION
SIGMA PARTICLES
PARTICLE PRODUCTION
BARYONS
BRANCHING RATIO
CESR STORAGE RING
CROSS SECTIONS
EXPERIMENTAL DATA
MASS DIFFERENCE
VECTOR MESONS
BASIC INTERACTIONS
BEAUTY PARTICLES
BOSONS
DATA
DECAY
ELECTROMAGNETIC INTERACTIONS
ELEMENTARY PARTICLES
FERMIONS
HADRONS
HYPERONS
INFORMATION
INTERACTIONS
LEPTON-LEPTON INTERACTIONS
MESONS
NUMERICAL DATA
PARTICLE INTERACTIONS
PARTICLE PROPERTIES
PSEUDOSCALAR MESONS
SIGMA BARYONS
STORAGE RINGS
STRANGE PARTICLES
645101* - High Energy Physics- Particle Interactions & Properties-Experimental- Electromagnetic Interactions & Properties
645102 - High Energy Physics- Particle Interactions & Properties-Experimental- Weak Interactions & Properties