Constraints on four-Fermi contact interactions from low-energy electroweak experiments
Abstract
We investigate the constraints on four-Fermi contact interactions from low-energy lepton-quark and lepton-lepton scattering experiments --- polarization asymmetries in electron (muon)-nucleon scattering experiments, cesium and thallium atom parity violation measurements, neutrino-nuclei and neutrino-electron scattering experiments. These constraints are then combined by assuming the lepton and quark universalities and SU(2)*U(1) gauge invariance of the contact interaction, which leave independent six lepton-quark and three pure-leptonic interactions.Impacts of these constraints on models with an additional Z-boson are briefly discussed. We also present updates of the low-energy constraints on the S and T parameters.
Cite
@article{arxiv.hep-ph/9707334,
title = {Constraints on four-Fermi contact interactions from low-energy electroweak experiments},
author = {Gi-Chol Cho and Kaoru Hagiwara and Seiji Matsumoto},
journal= {arXiv preprint arXiv:hep-ph/9707334},
year = {2008}
}
Comments
revised version submitted to Z.Phys.C