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The cross sections and forward-backward asymmetries of hadronic and leptonicevents produced in e+e- collisions at centre-of-mass energies of 130-183 GeVare presented. Results for ee, mumu, tautau, qq, bb and cc production show nosignificant deviation from the Standard Model predictions. This enableconstraints to be set upon physics beyond the Standard Model such asfour-fermion contact interactions, leptoquarks, Z' bosons and R-parityviolating squarks and sneutrinos. Limits on the energy scale Lambda of eeffcontact interactions are typically in the range from 2-10 TeV. Limits onR-parity violating sneutrinos reach masses of a few hundred GeV for largevalues of their Yukawa couplings.Comment: 43 pages, 18 figure

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