Fermi Constants and ``New Physics''

Details Fermi Constants and ``New Physics'' Fermi Constants and ``New Physics''

1999-03-22

arxiv.org/abs/hep-ph/9903451v1

Phys.Rev.D60:093006,1999

Physics

High Energy Physics

High Energy Physics - Phenomenology

14 pages

Scientific paper

10.1103/PhysRevD.60.093006

Various precision determinations of the Fermi constant are compared. Included are muon and (leptonic) tau decays as well as indirect prescriptions employing $\alpha, m_Z, m_W, \ssthwmzms, \Gamma(Z\to\ell^+\ell^-)$, and $\Gamma(Z \to \nu\bar \nu)$ as input. Their good agreement tests the standard model at the $\pm 0.1%$ level and provides stringent constraints on new physics. That utility is illustrated for: heavy neutrino mixing, 2 Higgs doublet models, S, T, and U parameters and excited $W^{\ast^\pm}$ bosons (Kaluza-Klein excitations). For the last of those examples, $m_{W^\ast}\gsims 2.9$ TeV is found.

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