2007, Vol.10, No.3, pp.284-290
The many-parameter fit of the LEP2 data on
,
µ+µ-,
processes is performed to estimate
possible signals of the Abelian Z'-boson beyond the standard
model. The model-independent relations between the Z' couplings
to the standard model particles allow to describe the Z' effects
in lepton processes by 4 independent parameters. No signal is
found by the complete LEP2 data set, and the 1.3σ signal is
detected by the fit of the backward bins. The Z' couplings to
the vector and axial-vector lepton currents are constrained
allowing the Z' boson with the mass of order 1 TeV. The
comparison with one-parameter fits is performed.
Key words:
beyond standard model, lepton processes, data fiting
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