Charmed and strange baryon production in 29 GeV electron positron annihilation
This dissertation presents measurements of the production rates of baryons with different strangeness and spin. The analyses presented here use data taken with the Mark III detector at the PEP storage ring, operating at a center of mass energy of 29 GeV. The ..xi../sup /minus// production rate is measured to be 0.017 +- 0.004 +- 0.004 per hadronic event, ..cap omega../sup /minus// production is measured to be 0.014 +- 0.006 +- 0.004 per hadronic event, and ..xi..*/sup 0/ production is less than 0.006 per hadronic event at a 90% confidence level. These measurements place strong constraints on models of baryon production. In particular, the unexpectedly high rate of ..cap omega../sup /minus// production is difficult to explain in any diquark based model. Semileptonic ..lambda../sub c//sup +/ decays have also been observed. Because neither the branching ratios nor the production rate are well known, it is difficult to interpret these results. However, they do indicate that the branching ratio for ..lambda../sub c//sup +/ ..-->.. ..lambda..l..nu.. may be higher than previous experimental measurements. 85 refs., 45 figs., 12 tabs.
- Research Organization:
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
- DOE Contract Number:
- AC03-76SF00515
- OSTI ID:
- 6918001
- Report Number(s):
- SLAC-330; ON: DE88017187; TRN: 88-034918
- Resource Relation:
- Other Information: Portions of this document are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
BARYONS
PARTICLE PRODUCTION
ANNIHILATION
BRANCHING RATIO
CHARM PARTICLES
CROSS SECTIONS
DRIFT CHAMBERS
ELECTRON-POSITRON INTERACTIONS
LAMBDA PARTICLES
MASS SPECTRA
MONTE CARLO METHOD
OMEGA PARTICLES
PARTICLE DECAY
SIGMA PARTICLES
STRANGE PARTICLES
STRING MODELS
XI PARTICLES
BASIC INTERACTIONS
COMPOSITE MODELS
DECAY
ELECTROMAGNETIC INTERACTIONS
ELEMENTARY PARTICLES
EXTENDED PARTICLE MODEL
FERMIONS
HADRONS
HYPERONS
INTERACTIONS
LAMBDA BARYONS
LEPTON-LEPTON INTERACTIONS
MATHEMATICAL MODELS
MEASURING INSTRUMENTS
MULTIWIRE PROPORTIONAL CHAMBERS
OMEGA BARYONS
PARTICLE INTERACTIONS
PARTICLE MODELS
PROPORTIONAL COUNTERS
QUARK MODEL
RADIATION DETECTORS
SIGMA BARYONS
SPECTRA
XI BARYONS
645103* - High Energy Physics- Particle Interactions & Properties-Experimental- Strong Interactions & Baryon & Meson Properties
645204 - High Energy Physics- Particle Interactions & Properties-Theoretical- Strong Interactions & Properties