منابع مشابه
Flavor Changing Fermion-Graviton Vertices
We study the flavor-changing quark-graviton vertex that is induced at the one-loop level when gravitational interactions are coupled to the Standard Model. Due to the conservation of the energy-momentum tensor the corresponding form factors turn out to be finite and gauge-invariant. Analytical expressions of the form factors are provided at the leading order in the external masses. We show that...
متن کاملBroken R parity contributions to flavor changing rates and CP asymmetries in fermion pair production at
We examine the effects of the R parity odd renormalizable interactions on flavor changing rates and CP asymmetries in the production of fermion-antifermion pairs at leptonic colliders. In the reactions, e − + e + → f J + ¯ f J ′ , [J = J ′ ] the produced fermions may be leptons, down-quarks or up-quarks, and the center of mass energies may range from the Z-boson pole up to 1000 GeV. Off the Z-b...
متن کاملFlavor-changing scalar interactions.
The smallness of fermion masses and mixing angles has recently been been attributed to approximate global U(1) symmetries, one for each fermion type. The parameters associated with these symmetry breakings are estimated here directly from observed masses and mixing angles. It turns out that although flavor changing reaction rates may be acceptably small in electroweak theories with several scal...
متن کاملFlavor 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 ...
متن کاملLepton Flavor Violation and Fermion Masses
Lepton flavor violation may be a signature of “GUT scale” physics, if the messenger scale for SUSY breaking is above the “GUT scale.” We elaborate on the details of this simple statement in the following talk.
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ژورنال
عنوان ژورنال: Physical Review D
سال: 2009
ISSN: 1550-7998,1550-2368
DOI: 10.1103/physrevd.79.053004