Measurement and Interpretation of Fermion-Pair Production at LEP energies above the Z Resonance

TL;DR

This paper reports precise measurements of fermion-pair production at energies above the Z resonance at LEP, confirming Standard Model predictions and exploring potential new physics such as Z' bosons, contact interactions, extra dimensions, and supersymmetry.

Contribution

It provides detailed experimental data and interpretations for e+e- -> ffbar processes at high energies, testing the Standard Model and constraining new physics models.

Findings

Measurements are consistent with Standard Model predictions.

Constraints on Z' bosons and contact interactions are established.

No evidence found for physics beyond the Standard Model.

Abstract

This paper presents DELPHI measurements and interpretations of cross-sections, forward-backward asymmetries, and angular distributions, for the e+e- -> ffbar process for centre-of-mass energies above the Z resonance, from sqrt(s) ~ 130 - 207 GeV at the LEP collider. The measurements are consistent with the predictions of the Standard Model and are used to study a variety of models including the S-Matrix ansatz for e+e- -> ffbar scattering and several models which include physics beyond the Standard Model: the exchange of Z' bosons, contact interactions between fermions, the exchange of gravitons in large extra dimensions and the exchange of sneutrino in R-parity violating supersymmetry.