Flavor-changing neutral currents and rareBdecays in 3-3-1 models
نویسندگان
چکیده
منابع مشابه
Flavor Changing Neutral Currents
A study of Rb and Rc is presented in the context of a Two Higgs Doublet Model (2HDM) with flavor changing scalar currents (FCSC). Implications of the model for the ρ-parameter and for b → sγ are also considered. The experimental data on Rb places stringent constraints on the model parameters. The configuration of the model needed to account for Rb is found to be irreconcilable with constraints ...
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We consider a Two Higgs Doublet Model with Flavor Changing Scalar Neutral Currents arising at the tree level. All the most important constraints are taken into account and the compatibility with the present Electroweak measurements is examined. The Flavor Changing couplings involving the third family are not constrained to be very small and this allows us to predict some interesting signals of ...
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The measured value of Ab, the Zbb asymmetry parameter, disagrees with the Standard Model at 99% confidence level. If genuine the discrepancy could indicate new interactions unique to third generation quarks, implying enhanced Z penguin amplitudes. Enhanced rates are predicted for rare K and B decays, such as K → πνν, KL → π νν, B → Xsνν, and Bs → μμ. Measurements of ǫ /ǫ then imply QCD penguin ...
متن کامل/ 98 09 59 0 v 1 3 0 Se p 19 98 SCALAR - MEDIATED FLAVOR - CHANGING NEUTRAL CURRENTS MARC SHER
The simplest extension of the standard model involves adding a scalar doublet–the so-called two-Higgs model. In general, the additional scalar will mediate tree-level flavor-changing neutral currents. Although one can arbitrarily impose a discrete symmetry to avoid these, it isn't necessary to do so; reasonable assumptions about the size of the flavor-changing couplings can make them sufficient...
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ژورنال
عنوان ژورنال: Physical Review D
سال: 2004
ISSN: 1550-7998,1550-2368
DOI: 10.1103/physrevd.70.117702