Study of fermion pair production in $e^{+} e^{-}$ collisions at 130-GeV to 183-GeV

The cross sections and forward-backward asymmetries of hadronic and leptonic events produced in e+e- collisions at centre-of-mass energies of 130-183 GeV are presented. Results for ee, mumu, tautau, qq, bb and cc production show no significant deviation from the Standard Model predictions. This enable constraints to be set upon physics beyond the Standard Model such as four-fermion contact interactions, leptoquarks, Z' bosons and R-parity violating squarks and sneutrinos. Limits on the energy scale Lambda of eeff contact interactions are typically in the range from 2-10 TeV. Limits on R-parity violating sneutrinos reach masses of a few hundred GeV for large values of their Yukawa couplings.

Note:

43 pages, 18 figures Report-no: CERN-EP/99-042

electron positron: colliding beams
electron positron: annihilation
lepton: pair production
quark: pair production
channel cross section: energy dependence
jet: charge
angular distribution: asymmetry
electroweak interaction: validity test
new interaction: upper limit
four-fermion interaction

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