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• W2136090085 endingPage "1891" @default.
• W2136090085 startingPage "1876" @default.
• W2136090085 abstract "We study the predictions of several extensions of the standard model (SM) for the ratio R=N(ppifmmodebarelsetextasciimacronfi{}ensuremath{rightarrow}Wensuremath{rightarrow}eensuremath{nu})/N(ppifmmodebarelsetextasciimacronfi{}ensuremath{rightarrow}Zensuremath{rightarrow}${e}^{+}$${e}^{mathrm{ensuremath{-}}}$). The starting point of our investigation is the observation that the SM prediction for R seems to be somewhat above the data, especially if the top quark is heavy. We first show that this situation is not changed qualitatively by the incorporation of full quark-mass-dependent QCD corrections for ${ensuremath{Gamma}}_{W}$ and ${ensuremath{Gamma}}_{Z}$. However, if either gauginos or exotic E(6) leptons with suitably chosen masses and mixings are present, the prediction for R can be reduced by 0.5--0.7 units. A similar reduction is possible if the Z boson mixes with the Z' boson present in certain SO(10) and E(6) models. For large top masses the reduction of R can be even larger if the b quark has a sizable SU(2)-singlet component, which is possible in superstring-inspired E(6) models. However, sleptons or squarks cannot reduce the prediction for R, and in models with two Higgs doublets R is expected to be close to its SM value. We then show that existing data strongly disfavor a sequential down-type quark below 26 GeV, and derive limits on the ${V}_{mathrm{tb}}$ element of the extended Kobayashi-Maskawa mixing matrix of four-generation models. We also show that the data on R together with existing bounds on the ensuremath{rho} parameter severely constrain models of four-generation quark mass matrices. Furthermore, we find that the simultaneous existence of a light photino and a chargino with mass below ${M}_{Z}$/2 is strongly disfavored. We finally discuss the possible effects of new physics on the bounds on the top-quark mass and the number of light neutrino species that can be derived from the experimental upper bound on R." @default.
• W2136090085 created "2016-06-24" @default.
• W2136090085 creator A5021592043 @default.
• W2136090085 creator A5026386506 @default.
• W2136090085 creator A5059297745 @default.
• W2136090085 creator A5087966666 @default.
• W2136090085 date "1988-04-01" @default.
• W2136090085 modified "2023-10-16" @default.
• W2136090085 title "Do data onWandZdecays already constrain nonstandard physics?" @default.
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