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Model-independent observables to pick out the Abelian Z' signal in the Bhabhaprocess are introduced at energies >= 200 GeV. They measure separately theZ'-induced vector and axial-vector four-fermion contact couplings. The analysisof the LEP2 data constrains the value of the Z'-induced vector four-fermioncoupling at the 2-sigma confidence level that corresponds to the Abelian Z'boson with the mass of order 1 TeV.Comment: 7 pages, 5 figures, uses RevTeX4. The text of the paper is completely  rewritte

physical review. d. particles, fields, gravitation, and cosmology/physical review. d, particles, fields, gravitation, and cosmology

Model-independent search for the Abelian<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi>Z</mml:mi><mml:mo>′</mml:mo></mml:msup></mml:math>boson in the Bhabha process

Model-independent search for the AbelianZ′boson in the Bhabha process