Constraints on four-Fermi contact interactions from low-energy electroweak experiments

Details Constraints on four-Fermi contact interactions from low-energy electroweak experiments Constraints on four-Fermi contact interactions from low-energy electroweak experiments

1997-07-13

arxiv.org/abs/hep-ph/9707334v3

Eur.Phys.J.C5:155-165,1998

Physics

High Energy Physics

High Energy Physics - Phenomenology

revised version submitted to Z.Phys.C

Scientific paper

10.1007/s100520050257

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.

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