An Interdisciplinary Journal

* 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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Last updated: *October 8, 2007*