Measurement of r and Search for the Top Quark in e+ e- Annihilation Between 39.8-GeV and 45.2-GeV

e + e − annihilation into hadrons was studied at CM energies between 39.8 and 45.2 GeV and a search was made for new heavy quarks. No evidence was found for the existence of a narrow state excluding the possible existence of the lowest vector toponium state in this mass range. A search for continuum production of heavy quarks led to lower mass limits for new quarks of 22.0 GeV ( e Q = 2 3 ) and 21.0 GeV ( e Q = 1 3 ). Quarks are found to be pointlike, the corresponding mass parameter being larger than 288 GeV. A fit of the QCD and the electroweak contributions to R = σ tot / σ μμ yielded sin 2 θ W = 0.30 −0.07 +0.23 .

ELECTRON POSITRON: COLLIDING BEAMS
ELECTRON POSITRON: ANNIHILATION
HADRON: ELECTROPRODUCTION
CROSS SECTION: HADRONIC
TOPONIUM
QUARKONIUM: SEARCH FOR
top: MASS
LOWER LIMIT
Weinberg angle
TASSO

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Figures(0)

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