منابع مشابه
Z-decays in the NMSSM
We study a subset of electroweak-precision observables consisting of MW , sin 2 θ eff, BR(Z → τ τ) and Γ(Z → ττ)/Γ(Z → ee)− 1 (characterizing leptonic Z-decays) in the context of the NMSSM. After a brief review of common MSSM-NMSSM effects (e.g. for Γ(Z → ττ)/Γ(Z → ee)− 1, which has been little discussed, even in the MSSM), specific NMSSM scenarios are studied, with the result that the NMSSM, c...
متن کاملRare Z Decays ∗ a † Gad
The central role played by rare decays on our understanding of elementary particle physics, is well known, where “rare” stands here for Flavor Changing Neutral Currents (FCNC), which are either small or practically vanishing in the SM. Some highlights: are: 1. In K physics: The first appearance of charm in loops from which mc ≈ 1.5 GeV was predicted [2]. 2. In B physics: The importance of b → s...
متن کاملUniversality-breaking effects in leptonic Z decays.
We analyze the possibility of universality violation in diagonal leptonic decays of the Z boson, in the context of interfamily ”see-saw” models. In a minimal extension of the Standard Model with right-handed neutrino fields, we find that universality-breaking effects increase quadratically with the heavy Majorana neutrino mass and may be observed in the running LEP experiments. PACS numbers: 12...
متن کاملPrompt Charmonium Production in Z Decays
The color-evaporation model quantitatively describes all data on photoproduction and hadroproduction of charmonium. Although the model is in part nonperturbative, the associated parameters can for instance be determined from the charmonium photoproduction data. At this point its predictions for the prompt production of ψ’s at the Z pole are made with no free parameters. We show here that this a...
متن کاملΛ ( 1520 ) production in Z decays
Preliminary DELPHI results from two analyses are presented: 1. Λ(1520) production in Z0→qq, 2. Inclusive ρ, f0(980), f2(1270), K ∗0 2 (1430) and f ′ 2(1525) production in Z 0→ qq. Both analyses are based on about 2 million multihadronic events collected in 1994 and 1995, using the particle identification capabilities of the DELPHI Ring Imaging Cherenkov detectors and measured ionisation losses ...
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ژورنال
عنوان ژورنال: Nuclear Physics B - Proceedings Supplements
سال: 2003
ISSN: 0920-5632
DOI: 10.1016/s0920-5632(03)80189-5