Z' signal from the LEP2 data

Abstract

The many-parametric fit of the LEP2 data on e^+e^-\to e^+e^-, μ^+μ^-, τ^+τ^- processes is performed to estimate 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 1.3σsignal is detected by the fit of the backward bins. The Z' couplings to the vector and axial-vector lepton currents are constrained. The comparisons with the one-parameter fits and with the LEP1 experiments are performed.

6 pages, 2 figures, RevTeX. The paper was completely rewritten. The errors in the first version were eliminated. The comparison with the LEP1 data is added

References in corpus (5)

• Tests of the Standard Model and Constraints on New Physics from Measurements of Fermion-Pair Production at 189-209 GeV at LEP
• Single Intermediate Vector Boson production in e+e- collisions at sqrt(s) = 183 - 209 GeV
• Model-independent constraints on contact interactions from LEP2 data analysis
• Model-independent search for the Abelian Z' boson in the Bhabha process
• Signals of the Abelian Z' boson within the analysis of the LEP2 data

Cited by in corpus (2)

• Radiative Generation of Lepton Masses with the $U(1{)}^{\prime }$ Gauge Symmetry
• Fitting of Z' parameters