Search for Manifestations of New Physics in Fermion-Pair Production at LEP
L3 Collaboration
TL;DR
This paper analyzes LEP data to search for signs of new physics beyond the Standard Model, including contact interactions, leptoquarks, scalar particles, and quantum gravity effects, but finds no evidence and sets new limits.
Contribution
It provides updated experimental limits on various new physics scenarios using LEP fermion-pair production data.
Findings
No evidence for new physics phenomena was observed.
New constraints were established on parameters of contact interactions and other models.
The results improve previous bounds on TeV-scale quantum gravity effects.
Abstract
The measurements of hadron and lepton-pair production cross sections and leptonic forward-backward asymmetries performed with the L3 detector at centre-of-mass energies between 130 GeV and 189 GeV are used to search for new physics phenomena such as: contact interactions, exchange of virtual leptoquarks, scalar quarks and scalar neutrinos, effects of TeV strings in models of quantum gravity with large extra dimensions and non-zero sizes of the fermions. No evidence for these phenomena is found and new limits on their parameters are set.
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