Fermi Constants and ``New Physics''
| dc.creator | Marciano, William J. | |
| dc.date | 1999-03-22 | |
| dc.date.accessioned | 2026-07-07T10:33:50Z | |
| dc.date.available | 2026-07-07T10:33:50Z | |
| dc.description | Various precision determinations of the Fermi constant are compared. Included are muon and (leptonic) tau decays as well as indirect prescriptions employing $α, m_Z, m_W, \ssthwmzms, Γ(Z\to\ell^+\ell^-)$, and $Γ(Z \to ν\bar ν)$ 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. | |
| dc.description | 14 pages | |
| dc.identifier | https://arxiv.org/abs/hep-ph/9903451 | |
| dc.identifier | http://arxiv.org/abs/hep-ph/9903451 | |
| dc.identifier | Phys.Rev.D60:093006,1999 | |
| dc.identifier | doi:10.1103/PhysRevD.60.093006 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/179260 | |
| dc.subject | High Energy Physics - Phenomenology | |
| dc.title | Fermi Constants and ``New Physics'' | |
| dc.type | text |