The European Physical Journal C

ISSN: 1434-6044 (printed version)
ISSN: 1434-6052 (electronic version)

Table of Contents

Abstract Volume 5 Issue 1 (1998) pp 155-165
DOI 10.1007/s100529800824

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

Gi-Chol Cho (1) (a), Kaoru Hagiwara (1)(2), Seiji Matsumoto (1) (a)

(1) Theory Group, KEK, Tsukuba, Ibaraki 305, Japan
(2) ICEPP, University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113, Japan

Received: 28 November 1997 / Published online: 26 February 1998

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 ${\rm SU(2)}_L\times{\rm U(1)}_Y$ 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.

(a) Research Fellow of the Japan Society for the Promotion of Science
(a) Research Fellow of the Japan Society for the Promotion of Science

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Present address : Theory Division CERN, CH-1211, Genève 23, Switzerland

Online publication: August 4, 1998
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