Direct tests of quantum chromodynamics in high-energy e/sup +/e/sup -/ annihilation at Petra

Thesis/Dissertation · Thu Jan 01 00:00:00 EST 1981

OSTI ID:5908066

Freeman, J E

With the TASSO detector at PETRA, we have studied QCD effects in the hadronic channel of e/sup +/e/sup -/ annihilation. In addition to events with 2 jets of hadrons, we have observed 3-jet events which are naturally described in the context of QCD as manifestations of the process e/sup +/e/sup -/ ..-->.. q anti qg. By studying distributions sensitive to the rate of 3-jet production in the range of 27 GeV < W < 37 GeV, we determined the strong coupling constant, ..cap alpha../sub s/ to be where 0.01 is the statistical error, and 0.03 is the systematic error. Comparing predictions of QCD models with the data, we found that the models accurately described the observed energy dependence of numerous distributions, as well as detailed properties of 3-jet events. By studying angular distributions of jet axes in 3-jet events, we found that our data were consistent with spin-1 gluons (0.9 sigma) while being in strong disagreement with the hypothesis of spin-0 gluons (4.5 sigma).

• Research Organization: Wisconsin Univ., Madison (USA)
• OSTI ID: 5908066
• Resource Relation: Other Information: Thesis (Ph. D.)
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ELECTRON-POSITRON INTERACTIONS
ANNIHILATION
QUANTUM CHROMODYNAMICS
GLUONS
JET MODEL
QUARKS
STRONG-COUPLING MODEL
BASIC INTERACTIONS
ELECTROMAGNETIC INTERACTIONS
ELEMENTARY PARTICLES
FIELD THEORIES
INTERACTIONS
LEPTON-LEPTON INTERACTIONS
MATHEMATICAL MODELS
PARTICLE INTERACTIONS
PARTICLE MODELS
POSTULATED PARTICLES
QUANTUM FIELD THEORY
645204* - High Energy Physics- Particle Interactions &amp; Properties-Theoretical- Strong Interactions &amp; Properties
645101 - High Energy Physics- Particle Interactions &amp; Properties-Experimental- Electromagnetic Interactions &amp; Properties
645400 - High Energy Physics- Field Theory