The phenomenology of extra neutral gauge bosons

Z′ and anomalous gauge coupling effects at LEP2 and their separation

Production of events with hadronic and leptonic final states has been measured in ${\rm e^+e^-}$ collisions at centre-of-mass energies of 130–172 GeV, using the OPAL detector at LEP. Cross-sections and leptonic forward-backward asymmetries are presented, both including and excluding the dominant production of radiative Z$\gamma$ events, and compared to Standard Model expectations. The ratio $R_{\rm b}$ of the cross-section for ${\rm b\bar b}$ production to the hadronic cross-section has been measured. In a model-independent fit to the Z lineshape, the data have been used to obtain an improved precision on the measurement of $\gamma$-Z interference. The energy dependence of $\alpha_{\mathrm{em}}$ has been investigated. The measurements have also been used to obtain limits on extensions of the Standard Model described by effective four-fermion contact interactions, to search for $t$-channel contributions from new massive particles and to place limits on gaugino pair production with subsequent decay of the gaugino into a light gluino and a quark pair.

/pdf/tests-of-the-standard-model-and-constraints-on-new-physics-50qobtr0s5.pdf

Tests of the standard model and constraints on new physics from measurements of fermion-pair production at 189 GeV at LEP

Measurement and interpretation of fermion-pair production at LEP energies of 183 and 189 GeV

Model independent constraints on the mass of extra neutral gauge bosons and their couplings to charged leptons are given for LEP II and a 500 GeVe+e− collider. Analytical exclusion limits are derived in the Born approximation. TheZ′ limits obtained with radiative corrections are always worse than those calculated at the Born level. Polarized beams are only useful for degrees of polarization essentially larger than 50%. Known discovery limits on extraZ bosons predicted by popularZ′ models are reproduced as special cases. TheZ′ constraints are compared to those predicted by four fermion contact interactions.

Model independent $Z^\prime$ constraints at future $e^{+} e^{-}$ colliders

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Model independent $Z^\prime$ constraints at future $e^{+} e^{-}$ colliders